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Anomalously enhanced oxygen isotope effect in La1.85Sr0.15CuO4doped with Fe

Authors
Journal
Applied Superconductivity
0964-1807
Publisher
Elsevier
Publication Date
Volume
1
Identifiers
DOI: 10.1016/0964-1807(93)90245-w
Disciplines
  • Physics

Abstract

Abstract The effect of oxygen isotope substitution on superconducting transition temperature T c has been studied in La 1.85Sr 0.15Cu 1−yFe yO 4 (0 < y < 0.01). The substitution for Cu by Fe suppresses T C and dramatically increases the oxygen isotope exponent α O , where T C ∝ M O −α o , M o is an oxygen isotope mass. The data are analyzed in terms of the Abrikosov-Gor'kov (AG) theory of superconductors with paramagnetic impurities. Both T C and α O show stronger dependence on the Fe concentration than predicted by this theory, while our experimental data on T C(y) and α O (y) for LSCO doped with Ni and Zn are in a good agreement with the AG theory.

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