Instabilities and disorder-driven first-order transition of the vortex lattice

Details Instabilities and disorder-driven first-order transition of the vortex lattice Instabilities and disorder-driven first-order transition of the vortex lattice

2000-08-06

arxiv.org/abs/cond-mat/0008092v1

Phys. Rev. Lett. 85, 3712 (2000).

Physics

Condensed Matter

Superconductivity

12 pages 3 figures. Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.85.3712

Transport studies in a Corbino disk geometry suggest that the Bragg glass phase undergoes a first-order transition into a disordered solid. This transition shows a sharp reentrant behavior at low fields. In contrast, in the conventional strip configuration, the phase transition is obscured by the injection of the disordered vortices through the sample edges, which results in the commonly observed vortex instabilities and smearing of the peak effect in NbSe2 crystals. These features are found to be absent in the Corbino geometry, in which the circulating vortices do not cross the sample edges.

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