Abstract
The thermodynamics of the mixed state of niobium is reconsidered. Critical fieldsH c (t),H c1(t),and H c2(t), Maki parameters κ1 and κ2, magnetization, and specific heat are measured with a computer-controlled magnetometer and calorimeter. The results show quantitative discrepancies with the isotropic Gorkov-Brandt theory over almost the whole mixed state. Computations based on Fermi surface anisotropy using a scaling ofH c2 provide a much better agreement with the experimental magnetization curves already in the limit of “weak nonlocality,” thus suggesting a numerical evaluation of the anisotropic terms in the Gorkov-Brandt theory.
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