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The temperature dependence of the magnetic field penetration depth lambda (T) is determined down to 0.2Tc by the ac-susceptibility measurements on the Rb3C60 fine powder with small, about 1 K, variation in the grains' superconducting transition temperatures. The lambda (T) temperature dependence is exponential at low temperatures, which allows us to determine the energy gap Delta 0=1.7kBTc. Deviations of the experimental dependence lambda (T) from BCS are small and can be explained by strong-coupling theory.
ї1994 The American Physical Society
PACS:
74.25.Ha, 74.70.Wz