Disorder Driven Melting of the Vortex Line Lattice

Details Disorder Driven Melting of the Vortex Line Lattice Disorder Driven Melting of the Vortex Line Lattice

2000-12-11

arxiv.org/abs/cond-mat/0012184v1

Phys. Rev. Lett. 87, 137001 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, 6 eps figures

Scientific paper

10.1103/PhysRevLett.87.137001

We use Monte Carlo simulations of the 3D uniformly frustrated XY model, with uncorrelated quenched randomness in the in-plane couplings, to model the effect of random point pins on the vortex line phases of a type II superconductor. We map out the phase diagram as a function of temperature T and randomness strength p for fixed applied magnetic field. We find that, as p increases to a critical value p_c, the first order vortex lattice melting line turns parallel to the T axis, and continues smoothly down to low temperature, rather than ending at a critical point. The entropy jump across this line at p_c vanishes, but the transition remains first order. Above this disorder driven transition line, we find that the helicity modulus parallel to the applied field vanishes, and so no true phase coherent vortex glass exists.

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