Abstract
We study on the two-band model with the interband pair-transfer interaction between oxygen 2p orbitals at the same atomic site. The Cu d x2−y2 orbital is included in the model in order to reflect a realistic electronic structure in the oxide high-Tc superconductors. The exact-diagonalization technique is applied to a cluster cut out of the CuCO2 plane, i.e., Cu4O8. When the on-site Coulomb energy Up = 0 for 2p orbitals, as the second band consisting of O pπ orbitals comes near the Fermi level, the superconducting (SC) pair correlation function enhances stepwise, indicating a SC state occurring. However, the SC region was found to be restricted to a modest value of Up. Analysis of the wave function in the case of one hole doping indicates that a doped hole in O pσ orbital forms a localized singlet with the intrinsic hole at Cu site, competing with the SC state.
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References
Kondo J (1963) Prog Theo Phys 29: 1–9
Yamaji K (1990) J Phys Soc Jpn 59: 677–691
Yamaji K (1991) Physica C177: 303–309
Yamaji K, Harigaya K, Yanagisawa T, Shimoi Y (1992) J Phys Soc Jpn 61: 3689–3698
Zhang FC, Rice TM (1988) Phys Rev B37: 3759–3761
Asai Y (1991) Physica C 185–189: 1633–1634
Hybertsen MS, Schlüter M, Christensen NE (1989) Phys Rev B39: 9028–9041
Ogata M, Shiba H (1988) J Phys Soc Jpn 57: 3074–3088
Nagaoka Y (1966) Phys Rev 147: 392–405
Matsukawa H, Fukuyama, H (1989) J Phys Soc Jpn 58: 3687–3697
Hirsch JE, Loh Jr E, Scalapino DJ, Tang S (1989) Phys Rev B39: 243–253
Yamaji K, Shimoi Y (1992) preprint; also proceedings of this symposium
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© 1993 Springer-Verlag Tokyo
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Shimoi, Y., Yamaji, K. (1993). Study on Superconducting Phase of Two-Band Model Including Cu Sites by Diagonalization Method. In: Bando, Y., Yamauchi, H. (eds) Advances in Superconductivity V. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68305-6_8
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DOI: https://doi.org/10.1007/978-4-431-68305-6_8
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-68307-0
Online ISBN: 978-4-431-68305-6
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