Structural transitions in a doped lanthanum cuprate

被引：7

作者：

Baek, S. -H. ^{[1
]}

Hammel, P. C. ^{[2
]}

Huecker, M. ^{[3
]}

Buechner, B. ^{[1
,4
]}

Ammerahl, U. ^{[5
]}

Revcolevschi, A. ^{[5
]}

Suh, B. J. ^{[6
]}

机构：

[1] IFW Dresden, Inst Solid State Res, D-01171 Dresden, Germany

[2] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[3] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[4] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany

[5] Univ Paris 11, Lab Chim Solides, F-91405 Orsay, France

[6] Catholic Univ Korea, Dept Phys, Puchon 420743, South Korea

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 17期

基金：

新加坡国家研究基金会;

关键词：

TEMPERATURE TETRAGONAL PHASE; SUPERCONDUCTIVITY; LA2-XSRXCUO4; STRIPES; LA2-XBAXCUO4; DYNAMICS; LA2CUO4; ORDER;

D O I：

10.1103/PhysRevB.87.174505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

La-139 NMR and relaxation measurements have been performed on La1.8-xEu0.2SrxCuO4 (x = 0.13 and 0.2) single crystals. The temperature dependence of the 139La NMR spectra in all the structural phases [high-temperature tetragonal (HTT) -> low-temperature orthorhombic (LTO) -> low-temperature tetragonal (LTT)] reveals the nonvanishing tilt angle of the CuO6 octahedra in the HTT phase, opposed to the case of La2-xSrxCuO4 where the tilt angle disappears immediately above the transition. Since La-139 relaxation data provide evidence of the thermodynamic critical fluctuations associated with the structural phase transitions, HTT -> LTO and LTO -> LTT, we conclude that the structural transitions in Eu-doped La2-xSrxCuO4 should be of the order-disorder type rather than of the displacive type observed in La2-xSrxCuO4. The change of the nature of the structural transitions caused by doping with Eu appears to be consistent with the LTO -> LTT transition that is absent in La2-xSrxCuO4.

引用

页数：5

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