59Co NMR study of the Co states in superconducting and anhydrous cobaltates -: art. no. 247602

被引：73

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] Ctr Etud Saclay, CEA, CNRS, 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 | 2005年 / 94卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.94.247602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Co-59 NMR spectra in oriented powders of Na0.35CoO2 and in its hydrated superconducting (HSC) phase Na0.35CoO2,1.3H(2)O reveal a single electronic Co state with identical T independent NMR shift tensor. These phases differ markedly from Na0.7CoO2, in which we resolve three types of Co sites. The large T variation of their spin susceptibilities chi(s) and the anisotropy of the orbital susceptibility chi(orb) allow us to conclude that charge disproportionation occurs in a nonmagnetic Co3+ and two magnetic sites with about 0.3 and 0.7 holes in the t(2g) multiplet. The data are consistent with those for the single Co site in the anhydrous and HSC phase assuming the expected Co3.65+ charge.

引用

页数：4

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