Abstract
Physical parameters in the so-called t - t ′ - J - J ′ model are determined for the hole-doped copper oxide superconductor, (La, Sr) 2 CuO 4 , by using the cluster model approach. We find that in the superconductor both freedoms of spin and charge, which are represented by J and t , respectively, should be taken into account on an equal basis. The dependence of J on two factors is examined in the cluster model; one is the magnitude of 2 p -3 d hybridization and the other is the charge transfer energy between Cu-3 d and O-2 p σ orbitals in the CuO 2 plane. The calculated values of J for various compounds with T-, T * - and T ′ -phases are compared with the experimental results. Finally, a role of apical oxygen in the Cu-oxides is examined by calculating the electronic state as a function of the energy level of the apical oxygen.
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