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Journal of Superconductivity

, Volume 8, Issue 4, pp 413–416 | Cite as

Intrinsic paramagnetic centers in 1-2-3 superconductors

  • M. A. Teplov
  • O. N. Bakharev
  • H. B. Brom
  • A. V. Dooglav
  • A. V. Egorov
  • E. V. Krjukov
  • O. B. Marvin
  • I. R. Mukhamedshin
  • V. V. Naletov
  • A. G. Volodin
  • D. Wagener
  • J. Witteveen
Article

Abstract

The169Tm “enhanced” NMR in TmBa2Cu3O6+x (x=0.5, 0.6) at temperatures below 4.2K and the63Cu(1) NQR in YBa2Cu3O6.5 at temperatures above 4.2K are used to study properties of intrinsic paramagnetic centers incorporated into superconducting materials. The spin-lattice relaxation of thulium and copper nuclei reveals three types of paramagnetic centers to be present in oxygen-deficient 1-2-3 superconductors, those are (1) two-level ones with a spin S=1/2, localized outside CuO2 bilayers, (2) singlet-ground-state paramagnetic centers with an integer spin S≥1 in CuO2 bilayers, and (3) exchange copper-oxygen clusters with a half-integer spin S≥5/2, localized in a nearest neighborhood of CuOx basal plane at boundaries of superconducting OrthoII microdomains.

Key words

1-2-3 superconductors NMR NQR spin-lattice relaxation paramagnetic centers 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • M. A. Teplov
    • 1
  • O. N. Bakharev
    • 1
    • 2
  • H. B. Brom
    • 2
  • A. V. Dooglav
    • 1
  • A. V. Egorov
    • 1
  • E. V. Krjukov
    • 1
  • O. B. Marvin
    • 1
  • I. R. Mukhamedshin
    • 1
  • V. V. Naletov
    • 1
  • A. G. Volodin
    • 1
  • D. Wagener
    • 3
  • J. Witteveen
    • 2
  1. 1.Kazan State UniversityKazanRussia
  2. 2.Leiden UniversityLeidenThe Netherlands
  3. 3.Universität BonnBonnGermany

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