Observation of bulk superconductivity in NaxCoO2•yH2O and NaxCoO2•yD2O powder and single crystals -: art. no. 217001

被引：88

作者：

Jin, R ^{[1
]}

Sales, BC

Khalifah, P

Mandrus, D

机构：

[1] Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA

[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.91.217001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Poly- and single-crystalline NaxCoO2 has been successfully intercalated with H2O and D2O as confirmed by x-ray diffraction and thermogravimetric analysis. Resistivity, magnetic susceptibility, and specific heat measurements show bulk superconductivity with T-c close to 5 K in both cases. The substitution of deuterium for hydrogen has an effect on T-c of less than 0.2 K. Investigation of the resistivity anisotropy of NaxCoO2.yH(2)O single crystals shows (a) almost zero resistivity below T-c, and (b) an abrupt upturn at T(*)similar to52 K in both the ab plane and the c direction. The implications of our results on the possible superconducting mechanism will be discussed.

引用

页数：4

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