Introduction | p. 1 |
Compounds of the ReOFeAs Type | p. 5 |
Crystallochemistry and Basic Physical Properties of Doped Compounds | p. 5 |
Crystal Structure | p. 5 |
Electron Doping | p. 5 |
Hole Doping | p. 8 |
Substitutions on the Fe Sublattice | p. 9 |
Superconducting Transition Temperature | p. 11 |
Critical Fields | p. 13 |
Effect of Pressure on the Tc | p. 14 |
Magnetic Properties | p. 18 |
Magnetic Structure | p. 18 |
Theoretical Explanation of Long-Range Magnetic Ordering in ReOFeAs | p. 20 |
Phase Diagrams | p. 24 |
Magnetic Fluctuations | p. 27 |
Electronic Structure | p. 28 |
Stoichiometric Compounds | p. 28 |
The Role of Magnetic Ordering and Doping | p. 34 |
Experimental Studies of the Fermi Surface | p. 38 |
Symmetry of the Superconducting Order Parameter | p. 41 |
Experimental Methods of Determining the Order Parameter | p. 41 |
Nuclear Magnetic Resonance | p. 42 |
Point-Contact Andreev Reflection | p. 46 |
Tunnel and Photoemission Spectroscopies (STS, PES, ARPES) | p. 53 |
Compounds of the AFe2As2 (A = Ba,Sr,Ca) Type | p. 57 |
Crystal and Electronic Structure | p. 57 |
Crystal Structure | p. 57 |
LDA Calculations of the Electronic Structure | p. 58 |
Experimental Studies of the Fermi Surface | p. 63 |
(Sr3Sc2O5)Fe2As2 and Other Similar Compounds | p. 69 |
Superconductivity | p. 72 |
Doping | p. 72 |
Coexistence of Superconductivity and Magnetism | p. 77 |
Effect of Pressure | p. 79 |
Symmetry of the Superconducting Order Parameter | p. 88 |
Measurements on the Josephson Contacts | p. 94 |
Critical Fields | p. 96 |
Magnetism | p. 98 |
Stoichiometric Compounds | p. 98 |
Doped Compounds | p. 102 |
Magnetic Excitations | p. 104 |
Other FeAs-Based Compounds | p. 109 |
Compounds of the FeSe, FeTe Type | p. 109 |
Superconducting Properties | p. 109 |
Unusual Magnetic Properties | p. 112 |
Electronic Structure of Stoichiometric Compounds | p. 115 |
Electronic Structure of Doped Compounds | p. 118 |
Magnetic Structure of FeTe | p. 120 |
Compounds of the LiFeAs Type | p. 122 |
Superconductivity | p. 122 |
Electronic Structure | p. 123 |
Compounds of the AFFeAs (A = Sr, Ca) Type | p. 126 |
Primary Experimental Observations | p. 126 |
Electronic Structure | p. 128 |
Theory Models | p. 131 |
General Properties of Compounds from Different Classes of FeAs-Systems and Corresponding Theory Objectives | p. 131 |
Crystal and Magnetic Structures | p. 131 |
Peculiarities of the Electronic Structure | p. 134 |
Asymmetry of the Electron/Hole Doping | p. 136 |
Problems of Symmetry of the Superconducting Order Parameter | p. 138 |
Isotopic Effect | p. 140 |
Role of Electron Correlations | p. 141 |
Dynamical Mean Field Theory (DMFT) | p. 141 |
LDA+DMFT Calculation for ReOFeAs Compounds | p. 145 |
LDA+DMFT Calculation on an Extended Basis | p. 148 |
Comparison with Experiment | p. 152 |
A Minimal Two-Orbital Model | p. 158 |
Formulation of the Model | p. 158 |
Band Structure of the Spectrum | p. 162 |
Mean Field Approximation | p. 164 |
Numerical Calculation for Small Clusters | p. 167 |
Multi-Orbital Model | p. 170 |
Formulation of the Model | p. 170 |
Equations for a Superconductor in the Fluctuation Exchange (FLEX) Approximation | p. 171 |
Properties of Superconductors with the s± Symmetry of the Order Parameter | p. 174 |
Three-Orbital Model | p. 178 |
Detailed Analysis of the 5-Orbital Model | p. 182 |
The Hamiltonian of the Model | p. 182 |
Spin and Charge Susceptibility | p. 184 |
Pairing of Electrons via Spin Fluctuations | p. 187 |
Possible Symmetries of the Superconducting Order Parameter | p. 190 |
Limit of Weak Coulomb Interaction | p. 194 |
Renormalization Group Analysis | p. 194 |
Equations for Superconducting and Magnetic Order Parameters | p. 202 |
Phase Diagram of the Model | p. 205 |
Peculiarities of the s±-Superconducting State | p. 207 |
The Limit of Strong Coulomb Interaction | p. 210 |
The t - J1 - J2-Model | p. 210 |
Superconductivity with Different Order Parameters | p. 212 |
Density of States and Differential Tunnel Conductivity | p. 215 |
The Hubbard Model with the Hund's Exchange | p. 217 |
Magnetic Long-Range Order and Its Fluctuations | p. 221 |
Two Approaches to the Problem | p. 221 |
The Itinerant Model | p. 224 |
The Localized Model: Spin Waves | p. 228 |
The Resonance Mode | p. 233 |
Unified Models | p. 240 |
FeAs-Compounds as Systems with Moderate Electron Correlations | p. 245 |
Orbital Ordering | p. 247 |
The Spin-Orbital Model | p. 247 |
Phase Diagrams with Spin and Orbital Orderings | p. 250 |
Spectrum of Magnetic Excitations | p. 251 |
Conclusion | p. 255 |
References | p. 259 |
Index | p. 277 |
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