Part I Materials |
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1 Introduction: Discovery and Current Status |
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3 | (18) |
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1.1 A Tale of the Discovery |
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3 | (5) |
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1.1.1 Background Research |
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3 | (2) |
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1.1.2 Electromagnetic Properties of LaTMPnO |
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5 | (2) |
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1.1.3 Emergence of Tc in LaFeAsO |
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7 | (1) |
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1.1.4 What Happens Around 150 K in LaFeAsO? |
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7 | (1) |
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1.2 A Brief History of Fe(Ni)-Based Superconductors at Early Stage |
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8 | (2) |
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1.3 Features of Fe-Based High Tc Superconductors |
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10 | (2) |
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12 | (4) |
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1.4.1 Discovery of Double Dome Structure in Tc |
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12 | (3) |
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15 | (1) |
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16 | (1) |
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17 | (4) |
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2 Synthesis, Structure, and Phase Diagram of Iron-Based Superconductors: Bulk |
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21 | (52) |
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22 | (19) |
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2.1.1 FeSe Superconductors |
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22 | (1) |
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2.1.2 Anti-PbFC1-Type Structure |
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23 | (1) |
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24 | (3) |
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2.1.4 ZrCuSiAs-Type Structure |
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27 | (6) |
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2.1.5 Superconductors with Perovskite-Type Blocking Layers |
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33 | (2) |
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2.1.6 Superconductors with Skutterudite Intermediary Layers |
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35 | (2) |
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2.1.7 Relationship Between Structure and Superconductivity |
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37 | (1) |
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2.1.8 Titanium Oxypnictides |
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38 | (2) |
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2.1.9 Composite Superconductor of Iron-Pnictide and Titanium Oxypnictide |
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40 | (1) |
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41 | (7) |
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2.2.1 Preparation for Polycrystalline Samples |
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43 | (3) |
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2.2.2 Growth of Single Crystals |
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46 | (2) |
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48 | (17) |
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48 | (3) |
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51 | (5) |
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56 | (5) |
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61 | (2) |
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63 | (2) |
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65 | (8) |
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3 Synthesis, Structure, and Phase Diagram: Film and STM |
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73 | (42) |
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73 | (1) |
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74 | (22) |
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3.2.1 FeSe Films Grown on Graphene |
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74 | (4) |
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3.2.2 Defect Effects on Superconductivity of FeSe Films |
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78 | (7) |
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3.2.3 Thickness-Dependent Superconductivity of FeSe Films Grown on Graphene |
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85 | (1) |
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3.2.4 Direct Observation of Nodes and Twofold Symmetry in FeSe Superconductor |
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86 | (6) |
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3.2.5 Interfacial Superconductivity of FeSe Films Grown on STO |
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92 | (4) |
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3.3 KxFe2-ySe2-z, Thin Films |
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96 | (12) |
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3.3.1 KxFe2-ySe2 Films on Graphene: Growth, Phase Separation, and Magnetic Order |
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97 | (6) |
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3.3.2 KxFe2-ySe2-z Films on STO: Growth and Phase Diagram |
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103 | (5) |
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108 | (1) |
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108 | (7) |
Part II Characterization |
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4 Electron Spectroscopy: ARPES |
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115 | (36) |
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115 | (3) |
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4.1.1 Angle-Resolved Photoemission Spectroscopy |
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115 | (1) |
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4.1.2 kz Measurement in ARPES |
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116 | (1) |
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4.1.3 Polarization Dependence and Orbital-Sensitive Probe |
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117 | (1) |
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4.2 Electronic Structure of Iron-Based Superconductors |
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118 | (6) |
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4.2.1 The Undoped Compounds |
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118 | (2) |
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4.2.2 The Effect of Carrier Doping |
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120 | (2) |
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4.2.3 The Effect of Chemical Pressure |
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122 | (2) |
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4.3 Broken Symmetry Phases |
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124 | (6) |
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4.3.1 Magnetic and Structural Transitions |
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124 | (2) |
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4.3.2 The Coexistence of SDW and Superconductivity |
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126 | (3) |
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4.3.3 Strongly Correlated Electronic Structure in Fe1+y Te |
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129 | (1) |
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4.4 The Superconducting Gap and Pairing Symmetry |
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130 | (5) |
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4.4.1 In-Plane Gap Distributions |
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131 | (1) |
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4.4.2 Gap Distribution Along kz |
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132 | (1) |
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132 | (3) |
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4.5 Heavily Electron Doped Iron-Chalcogenide |
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135 | (9) |
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4.5.1 Phase Separation in KxFe2-ySe2 |
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135 | (4) |
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4.5.2 Superconducting Gap in KxFe2-ySe2 |
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139 | (1) |
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4.5.3 Superconductivity in FeSe Thin Film |
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140 | (4) |
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144 | (2) |
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146 | (5) |
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5 Magnetic Order and Dynamics: Neutron Scattering |
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151 | (36) |
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151 | (2) |
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5.2 Static Antiferromagnetic Order |
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153 | (5) |
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5.3 Spin Waves in Parent Compounds |
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158 | (7) |
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5.4 Spin Excitations in Doped Compounds |
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165 | (8) |
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5.5 Neutron Polarization Analysis of Spin Excitations |
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173 | (5) |
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178 | (1) |
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178 | (9) |
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6 Optical and Transport Properties |
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187 | (36) |
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187 | (5) |
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189 | (2) |
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191 | (1) |
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6.2 Iron-Based Superconductors |
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192 | (21) |
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6.2.1 LaFeAsO1-xF, and Related Materials |
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193 | (2) |
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6.2.2 BaFe2As2 and Related Materials |
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195 | (12) |
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6.2.3 Fe1+δTe and FeTe1-x Sex |
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207 | (3) |
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210 | (3) |
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213 | (1) |
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214 | (1) |
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215 | (8) |
Part III Theory |
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7 First-Principles Studies in Fe-Based Superconductors |
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223 | (32) |
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223 | (4) |
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7.1.1 Normal State Electronic Structure |
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224 | (3) |
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7.2 Translational Symmetry: One-Fe-Atom Versus Two-Fe-Atom Perspective |
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227 | (6) |
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7.2.1 Change of Representation |
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227 | (2) |
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7.2.2 Important Physical Effects Revealed in One-Fe-Atom Representation |
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229 | (3) |
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7.2.3 Implication to Nodal Structures of Superconductivity Order Parameter |
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232 | (1) |
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7.3 Antiferromagnetic and Ferro-Orbital Correlations |
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233 | (3) |
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7.3.1 Anisotropy and Ferro-Orbital Order |
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233 | (2) |
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7.3.2 Consequence of Ferro-Orbital Order |
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235 | (1) |
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7.4 First Principles Simulations of Disordered Dopants in Fe-Based Superconductors |
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236 | (14) |
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7.4.1 Can Transition Metals Substitutions Dope Carriers in BaFe2As2? |
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236 | (4) |
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7.4.2 Effective Electron Doping by Fe Vacancies in Ax Fe2-y Se2 |
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240 | (3) |
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7.4.3 Can Se Vacancies Electron Dope Monolayer FeSe? |
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243 | (5) |
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7.4.4 Effects of Disordered Ru Substitution in BaFe2As2: Possible Realization of Superdiffusion in Real Materials |
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248 | (2) |
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250 | (5) |
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8 Itinerant Electron Scenario |
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255 | (76) |
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255 | (7) |
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8.2 The Electronic Structure of FeSCs |
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262 | (2) |
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8.3 The Low-Energy Model and the Interplay Between Magnetism and Superconductivity |
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264 | (12) |
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8.3.1 Ladder Approximation |
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267 | (3) |
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8.3.2 Beyond Ladder Approximation |
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270 | (6) |
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8.4 Interplay Between SDW Magnetism and Superconductivity, Parquet RG Approach |
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276 | (7) |
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8.4.1 Parquet Renormalization Group: The Basics |
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277 | (2) |
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8.4.2 pRG in a 2-Pocket Model |
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279 | (4) |
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8.5 Competition Between Density Wave Orders and Superconductivity |
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283 | (7) |
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284 | (6) |
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8.5.2 Summary of the pRG Approach |
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290 | (1) |
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8.6 SDW Magnetism and Nematic Order |
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290 | (7) |
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8.6.1 Selection of SDW Order |
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291 | (3) |
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8.6.2 Pre-emptive Spin-Nematic Order |
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294 | (2) |
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8.6.3 Consequences of the Ising-Nematic Order |
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296 | (1) |
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8.7 The Structure of the Superconducting Gap |
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297 | (18) |
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8.7.1 The Structure of s-Wave and d-Wave Gaps in a Multi-Band SC: General Reasoning |
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297 | (6) |
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8.7.2 How to Extract Uij(k, p) from the Orbital Model? |
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303 | (2) |
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8.7.3 Doping Dependence of the Couplings, Examples |
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305 | (6) |
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311 | (2) |
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8.7.5 Superconductivity Which Breaks Time-Reversal Symmetry |
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313 | (2) |
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8.8 Experimental Situation on Superconductivity |
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315 | (7) |
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8.8.1 Moderate Doping, Gap Symmetry |
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315 | (1) |
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8.8.2 Moderate Doping, s± vs s++ |
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316 | (1) |
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8.8.3 Moderate Doping, Nodal vs No Nodal s± Gap |
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317 | (2) |
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8.8.4 Strongly Doped FeSCs |
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319 | (2) |
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321 | (1) |
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322 | (9) |
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9 Orbital+Spin Multimode Fluctuation Theory in Iron-based Superconductors |
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331 | (46) |
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331 | (3) |
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9.2 Orbital Fluctuation Theory |
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334 | (10) |
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9.2.1 Quadrupole Interaction in the RPA |
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334 | (1) |
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9.2.2 Self-consistent VC Method |
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335 | (5) |
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340 | (1) |
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9.2.4 Kugel-Khomskii Model |
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341 | (1) |
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9.2.5 Superconductivity in SC-VCΣ Method |
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342 | (2) |
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9.3 Structural Transition and Softening of C66 |
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344 | (5) |
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9.3.1 Two Kinds of Structural Transitions Induced by the AL-VC |
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344 | (1) |
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9.3.2 Softening of C66, Enhancement of Raman Quadrupole Susceptibility Taman |
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345 | (4) |
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9.4 Comparison with the 2D Renormalization Group Theory |
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349 | (1) |
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9.5 Evidence of S++-Wave State in Iron-Based Superconductors |
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350 | (20) |
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9.5.1 Nonmagnetic Impurity Effect |
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351 | (2) |
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9.5.2 Impurity Induced Nematic State |
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353 | (3) |
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9.5.3 Neutron Scattering Spectrum |
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356 | (4) |
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9.5.4 Gap Functions in BaFe2(As,P)2 |
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360 | (4) |
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9.5.5 Superconducting Gap Function in LiFeAs |
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364 | (6) |
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370 | (1) |
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371 | (2) |
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373 | (4) |
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10 Coexisting Itinerant and Localized Electrons |
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377 | (32) |
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377 | (12) |
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10.1.1 Basic Experimental Evidence |
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378 | (3) |
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10.1.2 Theories for Iron-Based Superconductors |
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381 | (8) |
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10.2 Two-Fluid Description for Iron-Based Superconductors |
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389 | (10) |
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10.2.1 Two-Fluid Description Based on the Hybrid Model |
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389 | (2) |
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10.2.2 Low Energy Collective Modes |
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391 | (1) |
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10.2.3 Mean-Field Phase Diagram |
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392 | (2) |
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394 | (3) |
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397 | (2) |
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399 | (2) |
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401 | (8) |
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11 Weak and Strong Correlations in Fe Superconductors |
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409 | (569) |
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11.1 Introduction: Electronic Correlations? |
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409 | (5) |
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11.2 Essentials of the Electronic Structure of Fe-Based Pnictides and Chalcogenides |
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414 | (3) |
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11.3 Overall Correlation Strength: The "Janus" Effect of Hund's Coupling |
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417 | (7) |
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11.4 Orbital-Selective Mott Physics: Experimental and Ab Initio Evidences |
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424 | (3) |
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11.5 Orbital Decoupling, the Mechanism of Selective Mottness |
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427 | (4) |
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11.6 Back to Realism: FeSC and Two "Wrong" (Yet Instructive) Calculations |
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431 | (5) |
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Appendix: The Slope of the Linear Zα(nα) in the Orbital Decoupling Regime |
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436 | (2) |
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438 | (540) |
Index 443 |
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