59Co-NMR knight shift of superconducting NaxCoO2•yH2O

被引：76

作者：

Kobayashi, Y ^{[1
]}

Yokoi, M ^{[1
]}

Sato, M ^{[1
]}

机构：

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

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2003年 / 72卷 / 10期

关键词：

NaxCoO2 center dot yH(2)O; superconductivity; NMR; knight shift;

D O I：

10.1143/JPSJ.72.2453

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Layered Co oxide NaxCoO2.yH(2)O with the superconducting transition temperature T-c = 4.5 K has been studied by Co-59-NMR. The Knight shift K estimated from the observed spectra of a powder sample exhibits almost temperature (T)-independent behavior above T-c and decreases with decreasing T below T-c. This result and the existence of the coherence peak in the spin-lattice relaxation rate versus T curve reported by the present authors indicate, naively speaking, that the singlet order parameter with s-wave symmetry is realized in NaxCoO2.yH(2)O. Differences in the observed behaviors between the spectra of a nonaligned sample and those of an aligned sample embedded in epoxy adhesive by applying an external magnetic field are discussed.

引用

页码：2453 / 2455

页数：3