Electrical-resistivity, magnetic-susceptibility, and specific-heat data reveal that UBe f 3 is superconducting below 0.85 K. Highly anomalous low-temperature electronic properties in both the normal and superconducting states result in an enormous electronic specific-heat coefficient y = 1.1 J/mole K and a corresponding magnetic susceptibility y = 1.5&&10 emu/mole. The superconducting state appears to be extremely stable with an initial slope of the temperature derivative of the critical field (BH, 2/BT) q, =-257 kOe/K.
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