ANOMALOUS OXYGEN ISOTOPE EFFECT IN LA2-XSRXCUO4

被引：255

作者：

CRAWFORD, MK ^{[1
]}

KUNCHUR, MN ^{[1
]}

FARNETH, WE ^{[1
]}

MCCARRON, EM ^{[1
]}

POON, SJ ^{[1
]}

机构：

[1] UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.41.282

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report measurement of the oxygen isotope effect O in La2-xSrxCuO4 as a function of x. For values of x<0.15, O in the & is large (0.40.6) but decreases by about a factor of 5 for x0.15, where we obtain O 0.1, in good agreement with earlier results. The large values of O obtained for small x are reproducible when the O18,16O sample pairs are cross exchanged. The maximum measured values of O fall outside the range of standard Bardeen-Cooper- Schrieffer theory and may imply anharmonic phonon-mediated superconductivity. The variability of O may be related to a nearby lattice instability, similar to that observed in (La,Ba)2CuO4. Isotope frequency shifts of the far-infrared transverse-optic phonons of A2u symmetry at 240 and 500 cm-1 also display an anomaly between x=0.11 and 0.15 and, in addition, demonstrate O18 exchange for both oxygen sites. © 1990 The American Physical Society.

引用

页码：282 / 287

页数：6

共 28 条

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