Hyperfine Interactions

, Volume 93, Issue 1, pp 1621–1625 | Cite as

57Fe and57Co Mössbauer study of suppression of superconductivity in PrBa2Cu3O7−d

  • E. Kuzmann
  • M. Gal
  • Z. Homonnay
  • S. Nagy
  • Gy. Vankó
  • A. Vértes
Superconductivity

Abstract

57Fe and57Co Mössbauer spectroscopy and X-ray diffractometry were used to study57Fe- and57Co-substituted PrBa2Cu3O7−d samples. Our most striking result is that the isomer shifts belonging to both Co and Fe at four- and five-coordinated Cu(1) sites in the PrBa2Cu3O7−d cuprate are significantly higher than those observed for the superconducting 1-2-3 compounds. This result is considered as being a consequence of suppression of superconductivity because the extra electrons from Pr fill in the holes in Cu-O planes due to the valence state of Pr higher than 3+ and due to hybridization of Pr-Cu-O orbitals, via the charge transfer mechanism between the Cu(2)-O planes and Cu(1)-O chains. Our results give evidence of the existence of the charge transfer mechanism between the planes and the chains, and of its important role in controlling the superconductivity with a charge reservoir behavior of the Cu(1)-O chains.

Keywords

Spectroscopy Thin Film Charge Transfer Valence State Isomer Shift 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1994

Authors and Affiliations

  • E. Kuzmann
    • 1
  • M. Gal
    • 2
  • Z. Homonnay
    • 1
  • S. Nagy
    • 1
  • Gy. Vankó
    • 1
  • A. Vértes
    • 1
  1. 1.Department of Nuclear ChemistryEötvös Loránd UniversityBudapestHungary
  2. 2.Department of General and Inorganic ChemistryEötvös Loránd UniversityBudapestHungary

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