Magnetization Jump in a Model for Flux Lattice Melting at Low Magnetic Fields

Details Magnetization Jump in a Model for Flux Lattice Melting at Low Magnetic Fields Magnetization Jump in a Model for Flux Lattice Melting at Low Magnetic Fields

1997-03-29

arxiv.org/abs/cond-mat/9703251v3

Physics

Condensed Matter

updated figures and texts. new movies available at http://www.physics.ohio-state.edu:80/~ryu/jj.html. Accepted for publication

Scientific paper

10.1103/PhysRevLett.78.4629

Using a frustrated XY model on a lattice with open boundary conditions, we numerically study the magnetization change near a flux lattice melting transition at low fields. In both two and three dimensions, we find that the melting transition is followed at a higher temperature by the onset of large dissipation associated with the zero-field XY transition. It is characterized by the proliferation of vortex-antivortex pairs (in 2D) or vortex loops (in 3D). At the upper transition, there is a sharp increase in magnetization, in qualitative agreement with recent local Hall probe experiments.

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