Disordered Type-II Superconductors: A Universal Phase Diagram for Low-T$_c$ Systems

Details Disordered Type-II Superconductors: A Universal Phase Diagram for Low-T$_c$ Systems Disordered Type-II Superconductors: A Universal Phase Diagram for Low-T$_c$ Systems

2000-07-27

arxiv.org/abs/cond-mat/0007451v1

Physics

Condensed Matter

Superconductivity

23 pages, 9 figures

Scientific paper

10.1016/S0921-4534(00)01767-6

A universal phase diagram for weakly pinned low-T$_c$ 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-NbSe$_2$ and several other low-T$_c$ materials which is independent of the microscopic mechanisms of superconductivity in these systems.

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