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Metastability-induced charge and spin fluctuations in 123 type superconductors.

Author(s) : MOHAPATRA H. P., BEHERA D., MISRA S., MISHRA N. C., PATNAIK K.

Type of article: Article

Summary

Various defects arising from lattice mismatch and coordination incompatibility at the cation sites are known to lend the cuprates a metastable state at temperatures and pressures where they exhibit superconductivity. The paper considers the metastability induced by coordination incompatibility at copper(1) sites in oxygen-deficient 123 type systems and looks for their possible effects on charge and spin degrees of freedom. Depending upon the concentration of oxygen vacancies, the resulting unstable charge state at the copper(1) sites is shown to either temporally fluctuate or spatially equilibrate, providing a mechanism for the 90 and the 60 K plateaus, with a peak in the former observed in the YBCO(-) samples prepared under thermodynamic equilibrium conditions.

Details

  • Original title: Metastability-induced charge and spin fluctuations in 123 type superconductors.
  • Record ID : 1995-1391
  • Languages: English
  • Source: J. Supercond. - vol. 6 - n. 6
  • Publication date: 1993/12
  • Document available for consultation in the library of the IIR headquarters only.

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