Unconventional charge ordering in Na0.70CoO2 below 300 K -: art. no. 100404

被引：70

作者：

Gavilano, JL ^{[1
]}

Rau, D ^{[1
]}

Pedrini, B ^{[1
]}

Hinderer, J ^{[1
]}

Ott, HR ^{[1
]}

Kazakov, SM ^{[1
]}

Karpinski, J ^{[1
]}

机构：

[1] ETH Honggerberg, Festkorperphys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.69.100404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present the results of measurements of the dc-magnetic susceptibility chi(T) and the Na-23-NMR response of Na0.70CoO2 at temperatures between 50 and 340 K. The chi(T) data suggest that for T>75 K, the Co ions adopt an effective configuration of Co3.4+. The Na-23-NMR response reveals pronounced anomalies near 250 and 295 K, but no evidence for magnetic phase transitions is found in chi(T). Our data suggest the onset of a dramatic change in the Co 3d-electron spin dynamics at 295 K. This process is completed at 230 K. Our results may be interpreted as evidence for either a tendency to electron localization or an unconventional charge-density-wave phenomenon within the Co 3d electron system near room temperature.

引用

页数：4

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