Charge ordering and magnetopolarons in Na0.82CoO2 -: art. no. 167003

被引：71

作者：

Bernhard, C ^{[1
]}

Boris, AV ^{[1
]}

Kovaleva, NN ^{[1
]}

Khaliullin, G ^{[1
]}

Pimenov, AV ^{[1
]}

Yu, L ^{[1
]}

Chen, DP ^{[1
]}

Lin, CT ^{[1
]}

Keimer, B ^{[1
]}

机构：

[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.93.167003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using spectral ellipsometry, we measured the dielectric function of a Na0.82(2)CoO2 crystal that exhibits bulk antiferromagnetism with T-N=19.8 K. We identify two prominent transitions as a function of temperature. The first one at 280 K involves marked changes of the electronic and lattice responses that are indicative of charge ordering in the CoO2 layers. The second transition occurs around T-N=19.8 K and reveals sizable spin-charge coupling. The data are discussed in terms of charge ordering and formation of magnetopolarons due to a charge-induced spin-state transition of adjacent Co3+ ions.

引用

页码：167003 / 1

页数：4

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