Evidence for orbital ordering in LaCoO3 -: art. no. 224423

被引：214

作者：

Maris, G

Ren, Y

Volotchaev, V

Zobel, C

Lorenz, T

Palstra, TTM

机构：

[1] Univ Groningen, Ctr Mat Sci, Solid State Chem Lab, NL-9747 AG Groningen, Netherlands

[2] Argonne Natl Lab, Argonne, IL 60439 USA

[3] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.67.224423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present powder and single-crystal x-ray diffraction data as evidence for a monoclinic distortion in the low-spin (S=0) and intermediate spin states (S=1) of LaCoO3. The alternation of short and long bonds in the ab plane indicates the presence of e(g) orbital ordering induced by a cooperative Jahn-Teller distortion. We observe an increase of the Jahn-Teller distortion with temperature in agreement with a thermally activated behavior of the Co3+ ions from a low-spin ground state to an intermediate-spin excited state.

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页数：5

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