Disordered Type-II Superconductors: A Universal Phase Diagram for Low-Tc Systems
Abstract
A universal phase diagram for weakly pinned low-Tc type-II superconductors is revisited and extended with new proposals. The low-temperature ``Bragg glass'' phase is argued to transform first into a disordered, glassy phase upon heating. This glassy phase, a continuation of the high-field equilibrium vortex glass phase, then melts at higher temperatures into a liquid. This proposal provides an explanation for the anomalies observed in the peak effect regime of 2H-NbSe2 and several other low-Tc materials which is independent of the microscopic mechanisms of superconductivity in these systems.
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