A ballistic mutual-inductance technique has been employed to investigate the magnetic susceptibility of two uranium samples down to a temperature of 0.1^∘{}K. Both samples exhibited a superconducting transition in zero magnetic field at a temperature (Tc) of 0.68±{}0.02^∘{}K. The transitions were not sharp, being spread over a temperature interval of 0.45^∘{}K. The critical magnetic field of one of the samples was measured down to 0.37^∘{}K and a value of 720 gauss/deg was obtained for (dH/dT)_T=Tc. Consideration is given to the values of the electronic specific heat coefficients derived from the critical magnetic field data for uranium and titanium.
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Hein et al. (1957) studied this question.
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