Magnetic susceptibility study of hydrated and nonhydrated NaxCoO2•yH2O single crystals -: art. no. 144526

被引：51
作者：
Chou, FC [1 ]
Cho, JH
Lee, YS
机构：
[1] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA
[2] MIT, Dept Phys, Cambridge, MA 02139 USA
来源：
PHYSICAL REVIEW B | 2004年 / 70卷 / 14期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevB.70.144526
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have measured the magnetic susceptibility of single crystal samples of nonhydrated NaxCoO2 (xsimilar or equal to0.75,0.67,0.5,0.3) and hydrated Na0.3CoO2.yH(2)O (ysimilar or equal to0,0.6,1.3). Our measurements reveal considerable anisotropy between the susceptibilities with Hparallel toc and Hparallel toab. The derived anisotropic g-factor ratio (g(ab)/g(c)) decreases significantly as the composition is changed from the Curie-Weiss metal with x=0.75 to the paramagnetic metal with x=0.3. Fully hydrated Na0.3CoO2.1.3H(2)O samples have a larger susceptibility than nonhydrated Na0.3CoO2 samples, as well as a higher degree of anisotropy. In addition, the fully hydrated compound contains a small additional fraction of anisotropic localized spins.
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页码：144526 / 1
页数：6
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