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ORDER-DISORDER COEXISTENCE AND LIMIT OF METASTABILITY IN VORTEX LATTICES
 

Summary: ORDER-DISORDER COEXISTENCE AND
LIMIT OF METASTABILITY IN VORTEX LATTICES
E.Y. Andrei, Z.L. Xiao, O. Dogru
Department of Physics and Astronomy, Rutgers University,
Piscataway, New Jersey 08855 USA
P. Shuk and M. Greenblatt
Department of Chemistry, Rutgers University,
Piscataway, New Jersey 08855 USA
1. INTRODUCTION
Magnetic vortices in pure type II superconductors at low temperatures are ex-
pected to form a broken-symmetry state with long range translational order ie a
vortex crystal. As the temperature or field is increased the vortex crystal should
melt into a vortex liquid [1-4]. But this simple phase diagram is significantly altered
in real samples where material imperfections and the resulting random pinning po-
tential destroy the long range order[5-7]. Thus in relatively clean systems the low
temperature vortex lattice is replaced by a Bragg glass, where the lattice maintains its
topological order but supports local elastic distortions to accommodate the random
potential[8]. This state is expected to exhibit power law Bragg peaks in scattering
experiments[9]. With increasing field, temperature or strength of random potential,
the Bragg glass "melts" into a disordered state where Bragg peaks are no longer seen

  

Source: Andrei, Eva Y. - Department of Physics and Astronomy, Rutgers University

 

Collections: Materials Science; Physics