Neutron scattering study of novel magnetic order in Na0.5CoO2 -: art. no. 046403

被引：68

作者：

Gasparovic, G

Ott, RA

Cho, JH

Chou, FC

Chu, Y

Lynn, JW

Lee, YS

机构：

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

[2] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA

[3] Pusan Natl Univ, RCDAMP, Pusan 609735, South Korea

[4] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea

[5] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.96.046403

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 the magnetic order in single crystals of Na0.5CoO2. Our data indicate that below T-N = 88 K the spins form a novel antiferromagnetic pattern within the CoO2 planes, consisting of alternating rows of ordered and nonordered Co ions. The domains of magnetic order appear to be closely coupled to the domains of Na ion order, consistent with such a twofold symmetric spin arrangement. Magnetoresistance and anisotropic susceptibility measurements further support this model for the electronic ground state.

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页数：4

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