High-temperature Superconductivity: Experiment and Theory |
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Page 42
... correlation length έ on x in La2 - xSгx CuO4 [ 3.1 ] 8 : 5 20 20 10 3.8 Å √x 0 0 0.05 0.10 0.15 0.20 X do destroy the magnetic state in the system of spins at Cu2 + ions . A correlation length much smaller than the average distance ...
... correlation length έ on x in La2 - xSгx CuO4 [ 3.1 ] 8 : 5 20 20 10 3.8 Å √x 0 0 0.05 0.10 0.15 0.20 X do destroy the magnetic state in the system of spins at Cu2 + ions . A correlation length much smaller than the average distance ...
Page 59
... correlation length ( T ) / a of antiferromagnetic fluctuations for YBCO at y = 0 ( squares ) and y = 0.37 ( dots ) and LSCO at x = 0.15 ( crosses ) [ 3.22 ] ( b ) and y = 0.37 ( dots ) [ 3.23 ] . Figure 3.11b gives the temperature ...
... correlation length ( T ) / a of antiferromagnetic fluctuations for YBCO at y = 0 ( squares ) and y = 0.37 ( dots ) and LSCO at x = 0.15 ( crosses ) [ 3.22 ] ( b ) and y = 0.37 ( dots ) [ 3.23 ] . Figure 3.11b gives the temperature ...
Page 65
... length in the Ginsburg - Landau theory is a correlation length ¿ ( T ) . It determines a specific distance , within which the order parameter is coherent 1 ( V ( r ) ¥ ( 0 ) ) ∞ = exp ( −r / £ ) . where the average ( ... ) is ...
... length in the Ginsburg - Landau theory is a correlation length ¿ ( T ) . It determines a specific distance , within which the order parameter is coherent 1 ( V ( r ) ¥ ( 0 ) ) ∞ = exp ( −r / £ ) . where the average ( ... ) is ...
Contents
Introduction | 1 |
Thermodynamic Properties | 4 |
Antiferromagnetism in HighTemperature Superconductors | 33 |
Copyright | |
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anisotropy antiferromagnetic antiferromagnetic fluctuations antiferromagnetic order atom axis band BCS theory calculations cell contribution conventional superconductors Cooper pairs copper sites copper-oxide compounds copper-oxide superconductors correlation length coupling constant critical field CuO2 planes CuO4 CuO6 decrease density determined doping effective electron-phonon interaction energy excitations experimental Fermi surface frequency function Hamiltonian high-temperature superconductors impurities in-plane increase Knight shift La₂CuO4 lattice layer LMCO LSCO LTT phase magnetic field magnetic moment measurements mode neutron observed obtained order parameter orthorhombic orthorhombic phase oxide superconductors oxygen oxygen content oxygen ions phase transition phonon Phys quasi-particle relaxation rate samples scattering Sect shown in Fig single crystals singlet specific heat spectra spectrum spin fluctuations spin-lattice relaxation structural phase transitions studies superconducting superconducting phase superconducting transition susceptibility symmetry t-J model temperature dependence tetragonal tetragonal phase theory transition temperature valence wave vector YBCO YBCO compounds