2001/03/31 by Gautam I. Menon
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.65.104527
published as Phys. Rev. B, 65, 104527, (2002) · 70 pages, 9 postscript figures, modified title and minor changes in published version
openalex publication_date 2002/03/04 · arxiv created 2002/07/12 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A general phenomenology for phase behavior in the mixed phase of type-II superconductors with weak point pinning disorder is outlined. We propose that the ``Bragg glass'' phase generically transforms via two separate thermodynamic phase transitions into a disordered liquid on increasing the temperature. The first transition is into a glassy phase, topologically disordered at the largest length scales; current evidence suggests that it lacks the long-ranged phase correlations expected of a ``vortex glass.'' This phase has a significant degree of short-ranged translational order, unlike the disordered liquid, but no quasi-long-range order, in contrast to the Bragg glass. This glassy phase, which we call a ``multidomain glass,'' is confined to a narrow sliver at intermediate fields, but broadens out both for much larger and much smaller field values. Estimates for translational correlation lengths in the multidomain glass indicate that they can be far larger than the interline spacing for weak disorder, suggesting a plausible mechanism by which signals of a two-step transition can be obscured. Calculations of the Bragg glass--multidomain glass and the multidomain glass--disordered liquid phase boundaries are presented and compared to experimental data. We argue that these proposals provide a unified picture of the available experimental data on both high-Tc and low-Tc materials, simulations, and current theoretical understanding.