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
收藏
页码：4712 / 4715
页数：4
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