Lower critical fields of alkali-metal-doped fullerene superconductors

V. Buntar; F. M. Sauerzopf; H. W. Weber

doi:10.1103/PhysRevB.54.R9651

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Lower critical fields of alkali-metal-doped fullerene superconductors

V. Buntar, F. M. Sauerzopf, H. W. Weber

DOI 10.1103/PhysRevB.54.R9651 · Physical Review B

T1

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Abstract

We report on the lower critical field of fullerene superconductors derived from a "trapped magnetic moment" method. Superconducting K3C60, Rb3C60, and RbCs2C60 crystals and powders with shielding fractions between 3 and 100% were investigated. In contrast to all previous investigations made by other methods, the values of Hc1 are much smaller and of the order of 1 mT at T=0. We show that the smallness of Hc1 is not related to Josephson junctions and granularity, but is an intrinsic property of the fullerenes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
RbCs2C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown