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.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
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
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1993 Springer-Verlag Tokyo
About this paper
Cite this paper
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
Download citation
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
eBook Packages: Springer Book Archive