Altered Sr environment in La2-xSrxCuO4

被引：52

作者：

Haskel, D ^{[1
]}

Stern, EA ^{[1
]}

Hinks, DG ^{[1
]}

Mitchell, AW ^{[1
]}

Jorgensen, JD ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.56.R521

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The atomic arrangement about the Sr atoms in La2-xSrxCuO4 was investigated by Sr K-edge polarized x-ray-absorption fine structure on oriented powder with x=0.075 and 0.1 at T=20 K. Our results confirm that Sr resides at the La lattice site but we discovered it induces major structural distortions in neighboring oxygen atoms. In particular, our best fits indicate that the O(2) apical oxygen to Sr is split into two sites separated by 0.30(4) Angstrom, providing evidence for a strong lattice-hole interaction, i.e., a polaron, which may be involved in the pairing mechanism of these cuprates.

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页码：R521 / R524

页数：4

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