Abstract
The width of superconducting-normal transitions for inhomogeneous ellipsoidal superconductors in an applied magnetic field is calculated. A simple model is used for the variation in transition temperature with position and the range of this variation is assumed to be larger than the Landau-Ginzburg coherence length. It is found that the decrease in transition width with increasing applied magnetic fields at low fields occurs because the boundaries between superconducting and normal regions begin to be determined less by the inhomogeneities and more by the loss of condensation energy between domains, and by sample surface effects. At higher fields, the transition width increases with applied field because of the finite demagnetization coefficient.
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Koonce, C.S. Superconducting transition widths in applied magnetic fields. J Low Temp Phys 24, 597–610 (1976). https://doi.org/10.1007/BF00657169
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DOI: https://doi.org/10.1007/BF00657169