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

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

Pressure dependence of superconductivity in the Na₂Rb_0.5Cs_0.5C₆₀ fulleride

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

The pressure dependence of the superconducting transition temperature T_c of the primitive cubic quaternary fulleride Na₂Rb_0.5Cs_0.5C₆₀ (T_c=8.4K 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 Na₂CsC₆₀, we find that the evolution of T_c with interfullerene spacing in Na₂Rb_0.5Cs_0.5C₆₀ mimics that observed for Na₂CsC₆₀ and is comparable to the fee fulleride K₃C₆₀. However, the rate of change, dT_c/da, is about 5-6 times smaller than that reported for the quaternary fullerides Na₂Rb_1-xCs_xC₆₀ 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 language	English
Pages (from-to)	4439-4444
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	59
Issue number	6
Publication status	Published - 1999
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics

Cite this

@article{970612d1a6a04933a18295ed2ac5e786,

title = "Pressure dependence of superconductivity in the Na2Rb0.5Cs0.5C60 fulleride",

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 Pa{\=3} fullerides.",

author = "Brown, {Craig M.} and Taishi Takenobu and Konstantinos Kordatos and Kosmas Prassides and Yoshihiro Iwasa and Katsumi Tanigaki",

year = "1999",

language = "English",

volume = "59",

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journal = "Physical Review B-Condensed Matter",

issn = "0163-1829",

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TY - JOUR

T1 - Pressure dependence of superconductivity in the Na2Rb0.5Cs0.5C60 fulleride

AU - Brown, Craig M.

AU - Takenobu, Taishi

AU - Kordatos, Konstantinos

AU - Prassides, Kosmas

AU - Iwasa, Yoshihiro

AU - Tanigaki, Katsumi

PY - 1999

Y1 - 1999

N2 - 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.

AB - 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.

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SN - 0163-1829

VL - 59

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JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

IS - 6

ER -

Pressure dependence of superconductivity in the Na₂Rb_0.5Cs_0.5C₆₀ fulleride

Abstract

ASJC Scopus subject areas

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