High-temperature Superconductivity: Experiment and Theory |
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Page 105
... singlet Es ( ' A1g ) with regard to the triplet Er ( 3A19 ) state . As a result , the singlet state of Cu 3d and O 2p holes , | P ( 2 ) S ) , with a large binding energy may be viewed as a spinless charged quasi - particle on a ...
... singlet Es ( ' A1g ) with regard to the triplet Er ( 3A19 ) state . As a result , the singlet state of Cu 3d and O 2p holes , | P ( 2 ) S ) , with a large binding energy may be viewed as a spinless charged quasi - particle on a ...
Page 106
... singlet state | Þ ( 2 ) S ) is defined by the value of the splitting energy 2t for the ground ( A1g ) and excited ( B1u ) states of the system of the singlet | ( 2 ) S ) and the Cu 3d hole | ( 1 ) σ ) on the nearest site . Cluster ...
... singlet state | Þ ( 2 ) S ) is defined by the value of the splitting energy 2t for the ground ( A1g ) and excited ( B1u ) states of the system of the singlet | ( 2 ) S ) and the Cu 3d hole | ( 1 ) σ ) on the nearest site . Cluster ...
Page 168
... singlet and triplet p - d - bands disappears . Consequently , in the p - d - system , excitations of two types occur : low energy spin excitations when the singlet - triplet transition takes place and high - energy charge excitations ...
... singlet and triplet p - d - bands disappears . Consequently , in the p - d - system , excitations of two types occur : low energy spin excitations when the singlet - triplet transition takes place and high - energy charge excitations ...
Contents
Introduction | 1 |
Crystal Structure | 10 |
Transitions in La₂CuO4 Based Compounds | 18 |
Copyright | |
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absorption anisotropy antiferromagnetic approximation atom band BCS theory calculations charge carriers contribution conventional superconductors Cooper pairs copper sites copper-oxide compounds copper-oxide superconductors correlation length Coulomb correlations coupling constant CuO2 planes CuO4 d-wave decrease density described determined doping effective electron-phonon interaction energy excitations experimental Fermi surface frequency function Hamiltonian high-temperature superconductors hole concentration Hubbard model impurities in-plane increase Knight shift La₂CuO4 lattice layers Lett LSCO magnetic field measurements metallic method mode observed obtained one-particle optical order parameter orthorhombic orthorhombic phase oxide superconductors oxygen oxygen content oxygen ions phase transition phonon Phys Physica properties quasi-particle relaxation rate s-wave s-wave pairing samples scattering Sect shown in Fig single crystals singlet specific heat spectra spin fluctuations spin-lattice relaxation strong coupling studies superconducting superconducting pairing superconducting phase superconducting transition symmetry t-J model temperature dependence tetragonal theory transition temperature YBCO YBCO compounds