23Na NMR evidence for charge order and anomalous magnetism in NaxCoO2 -: art. no. 167601

被引：72

作者：

Mukhamedshin, IR ^{[1
]}

Alloul, H

Collin, G

Blanchard, N

机构：

[1] Univ Paris 11, Phys Solides Lab, UMR 8502, F-91405 Orsay, France

[2] CEA, CNRS, CE Saclay, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[3] Kazan VI Lenin State Univ, Dept Phys, Kazan 420008, Russia

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.93.167601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Oriented powder samples of NaxCoO2 are studied by Na-23 NMR and SQUID magnetometry. In nominal 0.50less than or equal toxless than or equal to0.70 solid state reacted samples the dominant phase synthesized has a single composition x(0)approximate to0.70. Three Na sites are identified from their single valued quadrupole effects and magnetic shifts, which implies a very definite order of the Na+ ions and of the Co charges in the CoO2 planes. The local susceptibility of the magnetic cobalt sites displays a large enhancement below 100 K with respect to the usually found high T Curie-Weiss law. This contrasts with the Pauli-like magnetism detected for xapproximate to0.35, the parent of the superconducting hydrated compound.

引用

页码：167601 / 1

页数：4

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