Interacting hole-spin model for oxide superconductors

Susumu Kurihara

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

It is shown that high-temperature superconductivity in cuprous oxide can be understood in terms of an interacting hole-spin model with superexchange and Kondo-type exchange interactions. Many important properties will be discussed, with special emphasis on the s-wave nature of Cooper pairs, reentrant behavior of Tc, finite isotope effect, and for YBa2Cu3O7-x, strong correlation between superconducting transition temperature and Cu(1)-O(4) bond length. The isotope effect has an origin quite different from the Bardeen-Cooper-Schrieffer theory, and the calculated value of its coefficient a is consistent with the experimental value 0.02. The main results of NMR studies, i.e. the s-wave nature of Cooper pairs as observed in O17 nuclei, and some puzzling aspects of the Cu NMR relaxation rates are discussed on the basis of the proposed model. A possible explanation to the anomaly in Cu NMR is given. It is predicted that oxygen ions should show a small displacement below the superconducting transition temperature Tc.

Original languageEnglish
Pages (from-to)6600-6606
Number of pages7
JournalPhysical Review B
Volume39
Issue number10
DOIs
Publication statusPublished - 1989
Externally publishedYes

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Oxide superconductors
Nuclear magnetic resonance
Isotopes
isotope effect
nuclear magnetic resonance
Superconducting transition temperature
oxides
transition temperature
BCS theory
Exchange interactions
Bond length
oxygen ions
Superconductivity
superconductivity
Ions
anomalies
Oxygen
nuclei
Oxides
coefficients

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Interacting hole-spin model for oxide superconductors. / Kurihara, Susumu.

In: Physical Review B, Vol. 39, No. 10, 1989, p. 6600-6606.

Research output: Contribution to journalArticle

Kurihara, Susumu. / Interacting hole-spin model for oxide superconductors. In: Physical Review B. 1989 ; Vol. 39, No. 10. pp. 6600-6606.
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