Muon-spin rotation study of magnetism in NaxCoO2 single crystals with 0.78≤x≤0.97

被引：11

作者：

Bernhard, C.

Niedermayer, Ch.

Drew, A.

Khaliullin, G.

Bayrakci, S.

Strempfer, J.

Kremer, R. K.

Chen, D. P.

Lin, C. T.

Keimer, B.

机构：

[1] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland

[2] Fribourg Ctr Nanomat FriMat, CH-1700 Fribourg, Switzerland

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

[4] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

EPL | 2007年 / 80卷 / 02期

关键词：

D O I：

10.1209/0295-5075/80/27005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By muon spin rotation we investigated the magnetic properties of a series of highly Na-doped NaxCoO2 single crystals with 0.78(1) <= x <= 0.97(1). Our data provide evidence for an intrinsically inhomogeneous magnetic state which can be described in terms of hole-doping (Na vacancy)-induced magnetic clusters that percolate at 1- x greater than or similar to 0.04 until they yield a bulk magnetic state near x= 0.78. Evidence for a strong (likely geometrical) frustration of the magnetic order is obtained from the anomalous doping dependence of the spin fluctuation rate (above the ordering temperature) which is strongly enhanced at x= 0.78 as compared to x= 0.97. Copyright (C) EPLA, 2007.

引用

页数：6

共 23 条

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