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Two-Phase Regime in the Magnetic Field-Temperature Phase Diagram of a Type-II Superconductor

L. L. A. Adams·Klaus Halterman·Oriol T. Valls·A. M. Goldman
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Abstract

The magnetic field and temperature dependencies of the magnetic moments of superconducting crystals of ${\rm V_{3}Si}$ have been studied. In a constant magnetic field and at temperatures somewhat below the superconducting transition temperature, the moments are hysteretic in temperature. However the magnetic moment-magnetic field isotherms are reversible and exhibit features that formally resemble the pressure-volume isotherms of the liquid-gas transition. This suggests the existence of a first-order phase transition, a two-phase regime, and a critical point in the superconducting phase diagram. The entropy change, determined from the data using the Clausius-Clapeyron equation, is consistent with estimates based on the difference in the vortex densities of the two phases.

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L. L. A. Adams, Klaus Halterman, Oriol T. Valls, A. M. Goldman. 2002-06-06. Two-Phase Regime in the Magnetic Field-Temperature Phase Diagram of a Type-II Superconductor. https://arxiv.org/abs/cond-mat/0206091

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