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

Craig M. Brown, Taishi Takenobu, Konstantinos Kordatos, Kosmas Prassides, Yoshihiro Iwasa, Katsumi Tanigaki

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21 Citations (Scopus)

Abstract

The pressure dependence of the superconducting transition temperature Tc of the primitive cubic quaternary fulleride Na2Rb0.5Cs0.5C60 (Tc=8.4K at ambient pressure) is studied by the ac susceptibility technique to 2.5 kbar. The observed value of dTc/dP is -1.22(2) K/kbar. Using the compressibility data available for Na2CsC60, we find that the evolution of Tc with interfullerene spacing in Na2Rb0.5Cs0.5C60 mimics that observed for Na2CsC60 and is comparable to the fee fulleride K3C60. However, the rate of change, dTc/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 Pa3̄ fullerides.

Original languageEnglish
Pages (from-to)4439-4444
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number6
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Brown, C. M., Takenobu, T., Kordatos, K., Prassides, K., Iwasa, Y., & Tanigaki, K. (1999). Pressure dependence of superconductivity in the Na2Rb0.5Cs0.5C60 fulleride. Physical Review B - Condensed Matter and Materials Physics, 59(6), 4439-4444.