铁砷化合物高温超导体 影印版：英文=High-Tc Superconductors Based on FeAs Compounds2025|PDF|Epub|mobi|kindle电子书版本百度云盘下载

铁砷化合物高温超导体 影印版：英文=High-Tc Superconductors Based on FeAs CompoundsPDF格式电子书版下载

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1 Introduction1

2 Compounds of the ReOFeAs Type5

2.1 Crystallochemistry and Basic Physical Properties of Doped Compounds5

2.1.1 Crystal Structure5

2.1.2 Electron Doping5

2.1.3 Hole Doping8

2.1.4 Substitutions on the Fe Sublattice9

2.1.5 Superconducting Transition Temperature11

2.1.6 CriticalFields13

2.1.7 Effect of Pressure on the Tc14

2.2 Magnetic Properties18

2.2.1 Magnetic Structure18

2.2.2 Theoretical Explanation of Long-Range Magnetic Ordering in ReOFeAs20

2.2.3 PhaseDiagrams24

2.2.4 Magnetic Fluctuations27

2.3 Electronic Structure28

2.3.1 Stoichiometric Compounds28

2.3.2 The Role of Magnetic Ordering and Doping34

2.3.3 Experimental Studies of the Fermi Surface38

2.4 Symmetry of the Superconducting Order Parameter41

2.4.1 Experimental Methods of Determining the Order Parameter41

2.4.2 Nuclear Magnetic Resonance42

2.4.3 Point-Contact Andreev Reflection46

2.4.4 Tunnel and Photoemission Spectroscopies(STS,PES,ARPES)53

3 Compounds of the AFe2As2(A=Ba,Sr,Ca)Type57

3.1 Crystal and Electronic Structure57

3.1.1 Crystal Structure57

3.1.2 LDACalculations of the Electronic Structure58

3.1.3 Experimental Studies of the Fermi Surface63

3.1.4 (Sr3Sc2O5)Fe2As2 and Other Similar Compounds69

3.2 Superconductivity72

3.2.1 Doping72

3.2.2 Coexistence of Superconductivity and Magnetism77

3.2.3 Effect of Pressure79

3.2.4 Symmetry of the Superconducting Order Parameter88

3.2.5 Measurements on the Josephson Contacts94

3.2.6 Critical Fields96

3.3 Magnetism98

3.3.1 Stoichiometric Compounds98

3.3.2 DopedCompounds102

3.3.3 MagneticExcitations104

4 Other FeAs-Based Compounds109

4.1 Compounds of the FeSe,FeTe Type109

4.1.1 Superconducting Properties109

4.1.2 Unusual Magnetic Properties112

4.1.3 Electronic Structure of Stoichiometric Compounds115

4.1.4 Electronic Structure of Doped Compounds118

4.1.5 Magnetic Structure of FeTe120

4.2 Compounds of the LiFeAs Type122

4.2.1 Superconductivity122

4.2.2 Electronic Structure123

4.3 Compounds of the AFFeAs(A=Sr,Ca)Type126

4.3.1 Primary Experimental Observations126

4.3.2 Electronic Structure128

5 Theory Models131

5.1 General Properties of Compounds from Different Classes of FeAs-Systems and Corresponding Theory Objectives131

5.1.1 Crystal and Magnetic Structures131

5.1.2 Peculiarities of the Electronic Structure134

5.1.3 Asymmetry of the Electron/Hole Doping136

5.1.4 Problems of Symmetry of the Superconducting Order Parameter138

5.1.5 Isotopic Effect140

5.2 Role of Electron Correlations141

5.2.1 Dynamical Mean Field Theory(DMFT)141

5.2.2 LDA+DMFT Calculation for ReOFeAs Compounds145

5.2.3 LDA+DMFT Calculation on an Extended Basis148

5.2.4 Comparison with Experiment152

5.3 A Minimal Two-Orbital Model158

5.3.1 Formulation of the Model158

5.3.2 Band Structure of the Spectrum162

5.3.3 Mean Field Approximation164

5.3.4 Numerical Calculation for Small Clusters167

5.4 Multi-Orbital Model170

5.4.1 Formulation of the Model170

5.4.2 Equations for a Superconductor in the Fluctuation Exchange(FLEX)Approximation171

5.4.3 Properties of Superconductors with the s？ Symmetry of the Order Parameter174

5.4.4 Three-Orbital Model178

5.5 Detailed Analysis of the 5-Orbital Model182

5.5.1 The Hamiltonian of the Model182

5.5.2 Spin and Charge Susceptibility184

5.5.3 Pairing of Electrons via Spin Fluctuations187

5.5.4 Possible Symmetries of the Superconducting Order Parameter190

5.6 Limit of Weak Coulomb Interaction194

5.6.1 Renormalization Group Analysis194

5.6.2 Equations for Superconducting and Magnetic Order Parameters202

5.6.3 Phase Diagram of the Model205

5.6.4 Peculiarities of the s？-Superconducting State207

5.7 The Limit of Strong Coulomb Interaction210

5.7.1 The t-J1-J2-Model210

5.7.2 Superconductivity with Different Order Parameters212

5.7.3 Density of States and Differential Tunnel Conductivity215

5.7.4 The Hubbard Model with the Hund's Exchange217

5.8 Magnetic Long-Range Order and Its Fluctuations221

5.8.1 Two Approaches to the Problem221

5.8.2 The Itinerant Model224

5.8.3 The Localized Model：Spin Waves228

5.8.4 The Resonance Mode233

5.8.5 Unified Models240

5.8.6 FeAs-Compounds as Systems with Moderate Electron Correlations245

5.9 Orbital Ordering247

5.9.1 The Spin-Orbital Model247

5.9.2 Phase Diagrams with Spin and Orbital Orderings250

5.9.3 Spectrum of Magnetic Excitations251

Conclusion255

References259

Index277