Anharmonic phonons and the anomalous isotope effect in La2-xSrxCuO4

Vincent H. Crespi, Marvin L. Cohen

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29 Scopus citations

Abstract

A model for the variation of an interionic potential near the orthorhombic to low-temperature-tetragonal structural phase transition in La-Sr-Cu-O can explain variations both above and below 0.5 in the superconducting isotope-effect parameter . In particular, we posit a quadrupolar potential in which the four outer wells deepen as the phase transition is approached. This model can reproduce the experimentally observed variations in both Tc and .

Original languageEnglish (US)
Pages (from-to)4712-4715
Number of pages4
JournalPhysical Review B
Volume44
Issue number9
DOIs
StatePublished - Jan 1 1991

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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