Three-dimensional spin fluctuations in Na0.75CoO2 -: art. no. 157206

被引：96

作者：

Helme, LM ^{[1
]}

Boothroyd, AT

Coldea, R

Prabhakaran, D

Tennant, DA

Hiess, A

Kulda, J

机构：

[1] Univ Oxford, Dept Phys, Oxford OX1 3PU, England

[2] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 15期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.94.157206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report polarized- and unpolarized-neutron scattering measurements of magnetic excitations in single-crystal Na0.75CoO2. The data confirm ferromagnetic correlations within the cobalt layers and reveal antiferromagnetic correlations perpendicular to the layers, consistent with an A-type antiferromagnetic ordering. The magnetic modes propagating perpendicular to the layers are sharp, and reach a maximum energy of similar to 12 meV. From a minimal spin-wave model, containing only nearest-neighbor Heisenberg exchange interactions, we estimate the interlayer and intralayer exchange constants to be 12.2 +/- 0.5 meV and -6 +/- 2 meV, respectively. We conclude that the magnetic fluctuations in Na0.75CoO2 are highly three dimensional.

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页数：4

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