Influence of magnetic rare-earth ion substitution on the magnetic susceptibility of high-TC superconductors

F. Zuo, B. R. Patton, D. L. Cox, S. I. Lee, Y. Song, J. P. Golben, X. D. Chen, S. Y. Lee, Y. Cao, Y. Lu, J. R. Gaines, J. C. Garland, A. J. Epstein

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

We report detailed magnetic-susceptibility studies for the oxygen-deficient perovskite superconductors MBa2Cu3O7- (M=Y,Gd,Er,Ho). Normal-state behavior above Tc shows weak ferromagnetic (antiferromagnetic) tendencies for M=Y,Gd (M=Er,Ho), with 87% of the free-ion moment for M=Gd,Er,Ho. The estimated Fermi-level density of states is 6.4 states/eV Cu for M=Y,Gd, which is twice the band-structure estimate. The superconducting state shows a 20% or more flux exclusion at small field. The Curie contributions for M=Gd,Er,Ho are weakened for T<Tc due to diamagnetic screening. The local moments appear to have little or no effect on the superconducting state. These effects are well described by a simple theoretical model.

Original languageEnglish (US)
Pages (from-to)3603-3607
Number of pages5
JournalPhysical Review B
Volume36
Issue number7
DOIs
StatePublished - Jan 1 1987
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Zuo, F., Patton, B. R., Cox, D. L., Lee, S. I., Song, Y., Golben, J. P., Chen, X. D., Lee, S. Y., Cao, Y., Lu, Y., Gaines, J. R., Garland, J. C., & Epstein, A. J. (1987). Influence of magnetic rare-earth ion substitution on the magnetic susceptibility of high-TC superconductors. Physical Review B, 36(7), 3603-3607. https://doi.org/10.1103/PhysRevB.36.3603