Superconductivity in rare-earth-doped oxygen-defect perovskites La2-x-yLnySrxCuO4-z

J. M. Tarascon, L. H. Greene, W. R. McKinnon, G. W. Hull

Research output: Contribution to journalArticle

Abstract

The structural, magnetic, and electronic properties of the mixed compounds La2-x-yLnySrxCuO4 for 0.15<x<0.25, 0.1<y<0.2 and Ln=Pr, Nd, Sm, Eu, Gd were studied. The magnetic susceptibility and the variation of the lattice parameters suggests all these rare earths are present in these materials as trivalent ions. DC resistance, ac susceptibility, Meissner and shielding measurements have shown that superconductivity persists among several members of the series. The magnetic rare earth ions depress Tc but do not destroy superconductivity. Within the series x=0.2 and y=0.3, the superconductivity transition temperatures, taken at the midpoint in resistivity, decrease from a maximum value at La (36.8K) to a minimum value at Gd (18.5K). It is suggested that the unit cell volume contraction observed through the lanthanide sequence, rather than magnetic interactions, is responsible for the observed depression in Tc.

Original languageEnglish (US)
Pages (from-to)499-505
Number of pages7
JournalSolid State Communications
Volume63
Issue number6
DOIs
StatePublished - Aug 1987

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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