Vortex matter in superconducting mesoscopic disks: Structure, magnetization, and phase transitions

Details Vortex matter in superconducting mesoscopic disks: Structure, magnetization, and phase transitions Vortex matter in superconducting mesoscopic disks: Structure, magnetization, and phase transitions

1998-06-04

arxiv.org/abs/cond-mat/9806056v1

Phys. Rev. B 58, R5948 (1998).

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.58.R5948

The dense vortex matter structure and associated magnetization are calculated for type-II superconducting mesoscopic disks. The magnetization exhibits generically first-order phase transitions as the number of vortices changes by one and presents two well-defined regimes: A non-monotonous evolution of the magnitude of the magnetization jumps signals the presence of a vortex glass structure which is separated by a second-order phase transition at $H_{c2}$ from a condensed state of vortices (giant vortex) where the magnitude of the jumps changes monotonously. We compare our results with Hall magnetometry measurements by Geim et al. (Nature 390, 259 (1997)) and claim that the magnetization exhibits clear traces of the presence of these vortex glass states.

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