59Co-NMR knight shift of aligned crystals and polycrystalline samples of superconducting Na0.3CoO2•1.3H2O

被引：48

作者：

Kobayashi, Y ^{[1
]}

Watanabe, H ^{[1
]}

Yokoi, M ^{[1
]}

Moyoshi, T ^{[1
]}

Mori, Y ^{[1
]}

Sato, M ^{[1
]}

机构：

[1] Nagoya Univ, Div Mat Sci, Dept Phys, Chikusa Ku, Nagoya, Aichi 4648602, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2005年 / 74卷 / 06期

关键词：

Na0.3CoO2 center dot 1.3H(2)O; superconductivity; NMR; knight shift;

D O I：

10.1143/JPSJ.74.1800

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The temperature (T) dependence of the Co-59-NMR Knight shifts K of Na0.3CoO2 center dot 1.3H(2)O has been studied, where samples of randomly oriented powder and aligned crystals have been used for the applied magnetic fields H parallel to ab plane and H parallel to c-axis, respectively. For both directions of H, the shift K decreases below the superconducting transition temperature T-c(H) with decreasing T, indicating that the superconducting electron pairs are in the singlet state. The upper critical fields H-c2(T) determined from the K(H)-T curves are found to be consistent with the values reported from the resistivity measurements for both directions of H.

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页码：1800 / 1805

页数：6

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