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Antiferromagnetism in HighTemperature Superconductors
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absorption anharmonic anisotropy antiferromagnetic antiferromagnetic fluctuations approximation atom band BCS theory calculations charge carriers charge transfer contribution conventional superconductors Cooper pairs copper sites copper-oxide compounds copper-oxide superconductors correlation length Coulomb correlations coupling constant CuO2 planes 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 method mode observed obtained one-particle optical order parameter orthorhombic orthorhombic phase oxide superconductors oxygen oxygen content oxygen ions phase transition phonon Phys Physica polaron properties quasi-particle relaxation rate s-wave 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 transition temperature wave vector weak coupling YBCO YBCO compounds