Pressure dependence of superconductivity in the Na2Rb0.5Cs0.5C60 fulleride

被引：18

作者：

Brown, CM ^{[1
]}

Takenobu, T

Kordatos, K

Prassides, K

Iwasa, Y

Tanigaki, K

机构：

[1] Univ Sussex, Sch Chem Phys & Environm Sci, Brighton BN1 9QJ, E Sussex, England

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[3] Japan Adv Inst Sci & Technol, Tatsunokuchi, Ishikawa 9231292, Japan

[4] Osaka City Univ, Fac Sci, Dept Mat Sci, Sumiyoshi Ku, Osaka 5588585, Japan

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.59.4439

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The pressure dependence of the superconducting transition temperature T-c of the primitive cubic quaternary fulleride Na2Rb0.5Cs0.5C60 (T-c = 8.4 K at ambient pressure) is studied by the ac susceptibility technique to 2.5 kbar. The observed value of dT(c/)dP is - 1.22(2) K/kbar. Using the compressibility data available for Na2CsC6.0, we find that the evolution of T-c with interfullerene spacing in Na2Rb0.5Cs0.5C60 mimics that observed for Na2CsC60 and is comparable to the fcc fulleride K3C60. However, the rate of change, dT(c/)da, is about 5-6 times smaller than that reported for the quaternary fullerides Na2Rb1-xCsxC60 as a function of x at ambient pressure, implying the presence of a strong alkali-metal specific effect, responsible for the differing effects of chemical and physical pressure on the superconducting properties of Pa (3) over bar fullerides.

引用

页码：4439 / 4444

页数：6

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