Pressure dependence of the superconducting transition temperature in nominal Rb0.5Cs2.5C60

R. Movshovich; J. D. Thompson; Chia-Chun Chen; C. M. Lieber

doi:10.1103/PhysRevB.49.3619

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Pressure dependence of the superconducting transition temperature in nominal Rb0.5Cs2.5C60

R. Movshovich, J. D. Thompson, Chia-Chun Chen, C. M. Lieber

DOI 10.1103/PhysRevB.49.3619 · Physical Review B

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Abstract

We report measurements of the superconducting transition temperature in a compound with a nominal composition Cs2.5Rb0.5C60 under hydrostatic pressure of up to 15.5 kbars. We observe two transitions, at temperatures T* and Tc in this pelletized sample. We identify the lower temperature transition T* with the onset of intergranular shielding currents. The upper transition temperature Tc(P) falls on a universal Tc(P) curve, defined from similar data obtained previously on K3C60 and Rb3C60, after we shift the pressure axis for our data by -2.6 kbars. We identify Tc as a superconducting transition in Rb2CsC60 on the basis of the compressibility analysis and published values of the lattice parameters for alkali-doped C60, as well as Tc(P=0) and (dTc/dP)P=0.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Cs2.5Rb0.5C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.5	Pressure unresolved	onset
Rb2CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31.8	Pressure unresolved	onset
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Cs2RbC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown