ANHARMONIC PHONONS AND THE ANOMALOUS ISOTOPE EFFECT IN LA2-XSRXCUO4

被引：26

作者：

CRESPI, VH ^{[1
]}

COHEN, ML ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720

来源：

PHYSICAL REVIEW B | 1991年 / 44卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.44.4712

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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-alpha. 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 T(c) and alpha.

引用

页码：4712 / 4715

页数：4

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