Sodium ion ordering and vacancy cluster formation in NaxCoO2 (x=0.71 and 0.84) single crystals by synchrotron x-ray diffraction

被引：47

作者：

Chou, F. C. ^{[1
,2
]}

Chu, M. -W. ^{[1
]}

Shu, G. J. ^{[1
]}

Huang, F. -T. ^{[1
,3
,4
]}

Pai, Woei Wu ^{[1
]}

Sheu, H. S. ^{[2
]}

Lee, Patrick A. ^{[5
]}

机构：

[1] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan

[2] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[3] Acad Sinica, Taiwan Int Grad Program, Taipei 115, Taiwan

[4] Natl Taiwan Univ, Dept Chem, Taipei 10617, Taiwan

[5] MIT, Dept Phys, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 12期

关键词：

Single crystals;

D O I：

10.1103/PhysRevLett.101.127404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In the rich phase diagram of Na(x)CoO(2), x=0.71 enjoys special stability and is called the Curie-Weiss metal due to its anomalous properties. Similarly, x=0.84 prepared from high temperature melt is a special end point beyond which the system phase separates. Using synchrotron x-ray diffraction on single crystals, we discovered root 12a and root 13a superlattice structures which we interpret as the ordering of Na (vacancy) clusters. These results lead to a picture of coexisting local moments and itinerant carriers and form the first step towards understanding the many anomalous properties of cobaltates.

引用

页数：4

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