Field-driven topological glass transition in a model flux line lattice

Details Field-driven topological glass transition in a model flux line lattice Field-driven topological glass transition in a model flux line lattice

1996-04-29

arxiv.org/abs/cond-mat/9604171v1

Physics

Condensed Matter

11 pages, 4 figures available upon request via snail mail from ryu@pacific.mps.ohio-state.edu

Scientific paper

10.1103/PhysRevLett.77.2300

We show that the flux line lattice in a model layered HTSC becomes unstable above a critical magnetic field with respect to a plastic deformation via penetration of pairs of point-like disclination defects. The instability is characterized by the competition between the elastic and the pinning energies and is essentially assisted by softening of the lattice induced by a dimensional crossover of the fluctuations as field increases. We confirm through a computer simulation that this indeed may lead to a phase transition from crystalline order at low fields to a topologically disordered phase at higher fields. We propose that this mechanism provides a model of the low temperature field--driven disordering transition observed in neutron diffraction experiments on ${\rm Bi_2Sr_2CaCu_2O_8\, }$ single crystals.

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