Electronic States of Cuprate Superconductors with Apical Halogen

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The electronic states of newly developed cuprate superconductors with apical halogen are ex-amined by means of the ionic and cluster model approaches developed in a previous study forother cuprates [Y. Ohta, T. Tohyama, and S. Maekawa, Phys. Rev. B 43 (1991) 2968]. We findtwo features that differ from those of other cuprates: (i) small dielectric constant and (11) largehopping energy of electrons in the C1102 plane. Both features are of primary importance forunderstanding the dependence of the energy gap and the superexchange interaction on the ma-terial of the parent compounds. As in other cuprates, the superconducting critical temperatureT. is found to be well correlated with the stability of the Zhang-Rice local singlet in the C1102plane.
社団法人日本物理学会の論文
1996-03-15