Structural difference between a superconducting sodium cobalt oxide and its related phase

被引：55

作者：

Takada, K

Sakurai, H

Takayama-Muromachi, E

Izumi, F

Dilanian, RA

Sasaki, T

机构：

[1] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

[2] Natl Inst Mat Sci, Superconducting Mat Ctr, Tsukuba, Ibaraki 3050044, Japan

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 01期

关键词：

superconductivity; layered material; hydrous sodium cobalt oxide;

D O I：

10.1016/S0022-4596(03)00336-0

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Monolayer hydrate (MLH) NaxCoO2 (.) gamma'H2O was obtained from superconducting bilayer hydrate (BLH) NaxCoO2 (.) gammaH(2)O by partial extraction of H2O molecules between the CoO2 layers. Magnetization measurements indicated that electron densities in the CoO2 layer of the MLH phase remained unchanged after the water extraction. Nevertheless, superconductivity was completely suppressed in the MLH phase. This strongly suggests that the highly 2D nature in the BLH phase due to its thick insulating layers consisting of H2O molecules and Na+ ions plays an important role for inducing superconductivity. (C) 2003 Elsevier Inc. All rights reserved.

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页码：372 / 376

页数：5

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