Orbital-order-induced metal-insulator transition in La1-xCaxMnO3

被引：93

作者：

Van Aken, BB ^{[1
]}

Jurchescu, OD

Meetsma, A

Tomioka, Y

Tokura, Y

Palstra, TTM

机构：

[1] Univ Groningen, Ctr Mat Sci, Solid State Chem Lab, Nijenborgh 4, NL-9747 AG Groningen, Netherlands

[2] AIST, CERC, Tsukuba, Ibaraki 3058562, Japan

[3] AIST, JRCAT, Tsukuba, Ibaraki 3050046, Japan

[4] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.90.066403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present evidence that the insulator-to-metal transition in La1-xCaxMnO3 near x similar to 0.2 is driven by the suppression of coherent Jahn-Teller distortions, originating from d-type orbital ordering. The orbital-ordered state is characterized by large long-range Q2 distortions below TO'-O*. Above TO'-O* we find evidence for coexistence between an orbital-ordered and an orbital-disordered state. This behavior is discussed in terms of electronic phase separation in an orbital-ordered insulating and an orbital-disordered metallic state.

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页数：4

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