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Upper Critical Magnetic Field of the Heavy-Fermion Superconductor UBe13
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https://doi.org/10.1103/physrevlett.54.477Abstract
The temperature dependence of the upper critical magnetic field Hc2(T) of the heavy-fermion superconductor UBe13 was determined resistively. The magnitude of the initial slope of Hc2(T), ∼420 kOe/K, is the largest value ever reported for a bulk superconductor. The curve of Hc2 vs T has an extremely unusual shape with a linear region that persists to very low temperatures. The anomalous shape of Hc2(T) cannot be accounted for by current theories of either conventional or p-wave superconductivity.
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