Lattice anomalies in (La,Sr)2CuO4 under epitaxial strain probed by polarized X-ray absorption spectroscopy

被引:0
作者
Oyanagi, H
Saini, NL
Tsukada, A
Naito, M
机构
[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[2] Univ Roma La Sapienza, INFM, Lab Reg, SUPERMAT, I-00185 Rome, Italy
[3] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[4] NTT Corp, Basic Res Labs, Kanazawa, Ishikawa 2430198, Japan
[5] Tokyo Univ Agr & Technol, Koganei, Tokyo 1848588, Japan
来源
JOURNAL OF SUPERCONDUCTIVITY | 2005年 / 18卷 / 5-6期
关键词
epitaxial strain; polarized EXAFS; local lattice anoinalies; MSRD;
D O I
10.1007/s10948-005-0070-6
中图分类号
O59 [应用物理学];
学科分类号
摘要
Local lattice anomalies in optimally doped T-(La,Sr)(2)CuO4 single crystal like thin films (T-c = 43.4 K) grown by molecular-beam epitaxy have been studied by the in-plane polarized Cu K-edge extended X-ray absorption fine structure (EXAFS). The results indicate temperature-dependent local atomic displacements which are anomalous at the Tc and below a higher temperature T-s as demonstrated by a change in the mean square relative displacement of the Cu-O bond sigma(2)(Cu-O), i.e.. a sharp drop at the T-c and a gradual deviation from a noncorrelated Debye-like behavior below T, where the spatial inhomogeneity appears. We find that the magnitude of the Cu-O displacement changes at the T-c, Delta sigma(2)(Cu-O) is enhanced by compressive strain while the tendency of charge segregation is suppressed. The results suggest that the uniaxial pressure effects stabilize the system by decreasing the onset temperature and magnitude of spatial heterogeneity.
引用
收藏
页码:731 / 735
页数:5
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