OBSERVATION OF A LOCAL STRUCTURAL-CHANGE AT TC FOR TL2BA2CACU2O8 BY PULSED NEUTRON-DIFFRACTION

被引：200

作者：

TOBY, BH

EGAMI, T

JORGENSEN, JD

SUBRAMANIAN, MA

机构：

[1] UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104

[2] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439

[3] DUPONT CO,DEPT CENT RES & DEV,EXPT STN,WILMINGTON,DE 19898

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.64.2414

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Deviations in atomic positions from those of the average crystallographic structure of superconducting Tl2ba2CaCu2O8 were studied by pair-distribution function (PDF) analysis of pulsed-neutron-scattering data. The PDF shows a clear change in the local structure at the onset of superconductivity. In addition to the previously observed local displacements of Tl and O within the Tl-O sheets, correlated displacements of O and Cu perpendicular to the Cu-O plane have been found. The arrangement of the O atoms appears to be different above and below Tc. © 1990 The American Physical Society.

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页码：2414 / 2417

页数：4

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