Simulation of Flux Lines with Columnar Pins: Bose Glass and Entangled Liquids

Details Simulation of Flux Lines with Columnar Pins: Bose Glass and Entangled Liquids Simulation of Flux Lines with Columnar Pins: Bose Glass and Entangled Liquids

2000-08-28

arxiv.org/abs/cond-mat/0008405v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures, one figure in .gif format; use xv to convert to .eps

Scientific paper

10.1103/PhysRevLett.86.4092

Using path integral Monte Carlo we simulate a 3D system of up to 1000 magnetic flux lines by mapping it onto a system of interacting bosons in (2+1)D. With increasing temperature we find a first order melting of flux lines from an ordered solid to an entangled liquid signalled by a finite entropy jump and sharp discontinuities in the defect density and the structure factor $S({\bf G})$ at the first reciprocal lattice vector. In the presence of a small number of strong columnar pins, we find that the crystal is transformed into a Bose glass phase with patches of crystalline order nucleated around the trapped vortices but with no overall positional or orientational order. This glassy phase melts into a defected entangled liquid through a continuous transition.

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