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xiii | |
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xiv | |
Notes on contributors |
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xvi | |
Preface |
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xix | |
Basic information on Russia's regions and regional terminology |
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xxi | |
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1 Studying Russia's regions to advance comparative political science |
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1 | (24) |
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2 Politics, governance, and the zigzags of the power vertical: toward a framework for analyzing Russia's local regimes |
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25 | (15) |
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3 Deference or governance? A survival analysis of Russia's governors under presidential control |
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40 | (23) |
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4 Why do political systems become party systems? Addressing a cross-national puzzle through subnational survey data |
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63 | (19) |
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5 Opposition parties in dominant-party regimes: inclusion and exclusion in Russia's regions |
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82 | (20) |
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6 National identity and xenophobia in Russia: opportunities for regional analysis |
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102 | (18) |
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Nicole M. Butkovich Kraus |
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7 Good governance: efficiency and effectiveness in Russian regional healthcare |
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120 | (20) |
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8 Inequality and authoritarian rule in Russia and China |
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140 | (22) |
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9 Making autocracy work? Russian regional politics under Putin |
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162 | |
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Bibliography |
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173 | (33) |
Index |
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206 | (307) |
Preface |
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xiii | |
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1 Iron-Based Superconductors: Discovery and Progress in Materials |
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1 | (52) |
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1 | (2) |
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1.2 Small History on Discovery and Progress in Parent Materials |
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3 | (3) |
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1.3 Crystal Structure of Parent Materials |
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6 | (5) |
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1.3.1 1111-Type Materials (LnFePnO, Ln: Lanthanide) |
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6 | (3) |
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1.3.2 122-Type Materials (AeFe2Pn2, Ae: Alkaline Earth or Eu) |
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9 | (1) |
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1.3.3 111-Type Materials (AFePn, A: Alkali Metal) |
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10 | (1) |
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1.3.4 11-Type Materials (Fe1+xSe) |
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10 | (1) |
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1.3.5 Homologous-Type Materials: (Fe2As2)(Aen+1MmOy) |
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10 | (1) |
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1.4 Parent Material and Superconductivity |
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11 | (12) |
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11 | (1) |
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12 | (3) |
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15 | (5) |
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1.4.2 Local Structure and Tc |
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20 | (3) |
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1.5 Unique Characteristics of FeSCs |
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23 | (4) |
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1.5.1 Multi-Band Nature of Fe3d |
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23 | (1) |
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1.5.2 Parent Material: Antiferromagnetic Metal |
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24 | (1) |
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25 | (1) |
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1.5.4 Large Critical Field and Small Anisotropy |
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25 | (1) |
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1.5.5 Advantageous Grain Boundary Nature |
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26 | (1) |
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27 | (5) |
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1.6.1 Growth of 1111-Type Crystals |
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27 | (2) |
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1.6.2 Growth of the 122-Type Crystals |
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29 | (1) |
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1.6.3 Characteristics of a Single Crystal |
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30 | (2) |
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32 | (8) |
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1.7.1 1111-Type Compounds |
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32 | (3) |
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35 | (3) |
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38 | (2) |
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1.8 Summary and Relevant New Superconductors |
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40 | (13) |
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2 Synthesis and Physical Properties of the New Potassium Iron Selenide Superconductor K0.80Fe1.76Se2 |
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53 | (36) |
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54 | (1) |
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55 | (2) |
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2.3 Crystal Growth and Stoichiometry |
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57 | (2) |
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2.4 Physical Properties of Single Crystals of K0.80Fe1.76Se2 |
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59 | (21) |
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2.4.1 Transport and Thermodynamic Properties |
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59 | (5) |
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2.4.2 London Penetration Depth and Magneto-Optical Imaging |
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64 | (2) |
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66 | (5) |
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2.4.4 57Fe Mossbauer Spectroscopy |
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71 | (8) |
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2.4.5 Phase Separation and Possible Superconducting Aerogel |
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79 | (1) |
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80 | (9) |
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3 Angle-Resolved Photoemission Spectroscopy of Iron Pnictides |
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89 | (36) |
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90 | (3) |
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91 | (2) |
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93 | (22) |
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3.2.1 Fermi Surface and Pairing Symmetry |
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93 | (1) |
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3.2.1.1 Hole-doped system |
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93 | (11) |
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3.2.1.2 Electron-doped system |
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104 | (4) |
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3.2.2 Many-Body Interactions |
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108 | (4) |
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112 | (3) |
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3.3 Concluding Remarks and Summary |
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115 | (10) |
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4 Quantum Oscillations in Iron Pnictide Superconductors |
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125 | (36) |
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126 | (3) |
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128 | (1) |
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4.1.1.1 Fermi surface geometry |
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128 | (1) |
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128 | (1) |
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4.2 Magnetic Field Dependence |
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129 | (1) |
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4.3 Temperature Dependence |
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130 | (1) |
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4.4 Iron Pnictide Superconductors |
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131 | (1) |
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4.5 Quantum Oscillations in Antiferromagnetic Parent Iron Pnictides |
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131 | (11) |
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4.5.1 Fermi Surface Geometry: Nonmagnetic and Antiferromagnetic Band Structure Calculations |
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134 | (3) |
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4.5.2 Experimental Comparison with Band Structure |
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137 | (4) |
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141 | (1) |
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4.6 Quantum Oscillations in Overdoped Paramagnetic Iron Pnictides |
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142 | (4) |
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4.6.1 Quasi-Nesting of Hole and Electron Cylinders |
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144 | (2) |
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4.7 Cuprates and Iron Pnictides: Electronic Structure Comparison |
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146 | (6) |
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4.7.1 Enhancement in Lindhard Function in Pnictides and Cuprates |
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147 | (2) |
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4.7.2 Quantum Critical Point under Superconducting Dome |
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149 | (3) |
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152 | (9) |
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5 Optical Investigation on Iron-Based Superconductors |
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161 | (82) |
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161 | (3) |
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5.2 Introduction About Optical Properties of Solids |
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164 | (12) |
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164 | (2) |
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5.2.2 Interband and Intraband Excitations |
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166 | (2) |
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5.2.3 Drude Model and Drude-Lorentz Model |
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168 | (2) |
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5.2.4 Extended Drude Model |
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170 | (2) |
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172 | (2) |
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5.2.6 Optical Response of Broken Symmetry States of Metals |
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174 | (2) |
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5.3 Optical Studies on the Parent Compounds |
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176 | (10) |
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5.3.1 Spin Density Wave Gap in FeAs-Based Compounds |
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177 | (5) |
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5.3.2 Absence of SDW Gap in FeTe1+x |
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182 | (2) |
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5.3.3 Fully Localized Fe 3d Electrons in K0.8Fe1.6Se2 |
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184 | (2) |
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5.4 Multi-Components vs. Extended Drude Model Analysis of Optical Conductivity |
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186 | (6) |
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5.5 Electron Correlations in the Fe-Pnictides/Chalcogenides |
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192 | (9) |
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5.5.1 Kinetic Energy Reduction by Electron Correlations |
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192 | (4) |
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5.5.2 Effect of Hund's Coupling |
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196 | (5) |
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5.6 Anisotropic Charge Dynamics |
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201 | (13) |
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5.6.1 c-Axis Optical Properties in Parent Compounds |
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201 | (3) |
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5.6.2 Anisotropic Optical Properties within ab-Plane |
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204 | (5) |
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5.6.3 c-Axis Optical Properties of Superconducting Compounds |
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209 | (5) |
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5.7 Optical Properties of Iron-Based Superconductors Below Tc |
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214 | (29) |
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5.7.1 Probing the Superconducting Energy Gaps |
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214 | (9) |
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5.7.2 Josephson Coupling Plasmon in KxFe2-ySe2 |
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223 | (3) |
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5.7.3 Superconductivity-Induced Spectral Weight Transfer |
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226 | (4) |
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5.7.4 Coherent Peak Below Tc Probed by THz Spectroscopy |
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230 | (13) |
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6 Antiferromagnetic Spin Fluctuations in the Fe-Based Superconductors |
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243 | (32) |
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244 | (2) |
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6.2 Antiferromagnetism in Parent Compounds |
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246 | (10) |
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6.2.1 Long-Range Antiferromagnetic Order |
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246 | (3) |
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249 | (4) |
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6.2.3 Destruction of Antiferromagnetic Order |
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253 | (3) |
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6.3 Magnetic Excitations in the Superconducting State |
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256 | (8) |
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257 | (4) |
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6.3.2 Field Effect on Magnetic Resonance |
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261 | (3) |
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6.3.3 Field-Induced Magnetization |
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264 | (1) |
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6.4 Magnetic Excitations in the Normal State |
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264 | (4) |
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6.4.1 In-Plane Anisotropy in the "122" System |
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264 | (1) |
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6.4.2 Incommensurate Magnetic Excitations in the "11" System |
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265 | (3) |
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268 | (7) |
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7 Review of NMR Studies on Iron-Based Superconductors |
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275 | (82) |
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275 | (1) |
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276 | (11) |
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276 | (2) |
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7.2.2 Knight Shift and Nuclear Spin-Lattice Relaxation Rate in Metals |
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278 | (3) |
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7.2.3 Knight Shift and Nuclear Spin-Lattice Relaxation Rate in the Superconducting State |
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281 | (6) |
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7.3 NMR Experimental Results on Iron-Based Superconductors |
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287 | (59) |
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7.3.1 LaFeAs(01-xFx) and LaFeAsO1-σ with "1111" Structure |
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287 | (1) |
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7.3.1.1 LaFeAsO: parent compound |
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288 | (3) |
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7.3.1.2 Normal state of LaFeAs(O1-xFx) and LaFeAsO1-σ |
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291 | (8) |
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7.3.1.3 Superconducting state of LaFeAs(O1-xFx) and LaFeAsO1-σ |
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299 | (6) |
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7.3.2 NMR Study in "122" System |
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305 | (2) |
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307 | (6) |
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7.3.2.2 NMR in the normal state of BaFe2(As1-xPx)2 |
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313 | (6) |
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7.3.2.3 NMR in the normal state of Ba(Fe1-xCox)2As2 |
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319 | (4) |
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7.3.2.4 NMR in the normal state of (Ba1-xKx)Fe2As2 |
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323 | (2) |
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7.3.2.5 NMR results on the superconducting state of "122" compounds |
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325 | (7) |
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7.3.3 NMR Study in "111" System, LiFeAs and NaFeAs |
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332 | (5) |
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7.3.4 NMR Study in "11" System, FeSe |
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337 | (3) |
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7.3.5 NMR Study in KxFe2-ySe2 |
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340 | (6) |
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346 | (11) |
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8 Material Specific Model Hamiltonians and Analysis on the Pairing Mechanism |
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357 | (74) |
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358 | (1) |
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8.2 Model Hamiltonian Construction |
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359 | (9) |
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359 | (7) |
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8.2.2 Electron-Electron Interactions |
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366 | (2) |
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8.3 Spin Fluctuations and Antiferromagnetism |
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368 | (10) |
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8.3.1 Random Phase Approximation |
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368 | (1) |
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8.3.2 Electron-Hole Interaction |
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369 | (5) |
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8.3.3 Antiferromagnetism in the Parent Compound |
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374 | (4) |
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378 | (12) |
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8.4.1 General Theory on Fluctuation Mediated Pairing |
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378 | (4) |
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8.4.2 Spin Fluctuation Mediated Pairing |
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382 | (4) |
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8.4.3 Orbital Fluctuation Mediated Pairing |
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386 | (1) |
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8.4.4 Theoretical Proposals for the Detection of the Pairing State Based on the Effective Multiorbital Hamiltonian |
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387 | (3) |
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390 | (23) |
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8.5.1 Some Experimental Observations |
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390 | (2) |
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8.5.2 Lattice Structure Dependence of the Band Structure and the Electron-Electron Interactions |
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392 | (1) |
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392 | (3) |
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395 | (2) |
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8.5.2.3 Three dimensionality |
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397 | (3) |
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8.5.3 Material Dependence of the Spin Fluctuations and Superconductivity |
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400 | (1) |
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8.5.3.1 Lattice structure dependence |
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400 | (7) |
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8.5.3.2 Doping dependence |
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407 | (3) |
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8.5.3.3 Effect of the three dimensionality |
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410 | (3) |
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8.6 Concluding Remarks and Perspectives |
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413 | (18) |
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9 The Antiferromagnetic Phase of Iron-Based Superconductors: An Itinerant Approach |
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431 | (42) |
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431 | (3) |
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9.2 A Primer: Single-Band Hubbard Model |
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434 | (3) |
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9.3 Magnetic Order in Ferropnictides |
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437 | (11) |
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9.3.1 Magnetic Frustration |
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437 | (4) |
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9.3.2 Lifting the Magnetic Ground State Degeneracy at TN |
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441 | (4) |
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9.3.3 Ising Nematic Order Above TN |
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445 | (3) |
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9.4 Spin Waves in Itinerant Multiorbital Systems |
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448 | (18) |
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9.4.1 Multiorbital Models - Spin Wave Theory |
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448 | (3) |
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9.4.2 Accidental Collective Modes in Itinerant Frustrated Antiferromagnets |
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451 | (7) |
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9.4.3 Two Orbital Model: Orbital versus Excitonic Scenario |
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458 | (6) |
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9.4.4 Comparison to Experiments |
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464 | (2) |
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9.5 Discussion and Conclusion |
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466 | (7) |
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10 Magnetism in Parent Compounds of Iron-Based Superconductors |
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473 | (40) |
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474 | (2) |
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10.2 Experimental Results on the Parent Compounds of Iron-Based Superconductors |
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476 | (7) |
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10.2.1 Results on Iron-Pnictides |
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476 | (2) |
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10.2.2 Results on Iron-Chalcogenides |
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478 | (4) |
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10.2.3 Electronic Structures and Resistivity Anisotropy |
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482 | (1) |
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483 | (20) |
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10.3.1 Results of First Principle Electronic Structure Calculation |
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483 | (2) |
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10.3.2 Effective Magnetic Exchange Models for Iron-Pnictides |
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485 | (5) |
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10.3.3 Effective Magnetic Exchange Models for Iron-Chalcogenides |
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490 | (1) |
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491 | (4) |
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495 | (3) |
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10.3.4 A Unified Minimum Magnetic Exchange Model for Iron-Based Superconductors |
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498 | (5) |
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10.4 Electronic Nematism and the Interplay Between Lattice, Spin and Orbital |
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503 | (4) |
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507 | (6) |
Index |
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513 | |