Two-Step Melting of the Vortex Solid in Layered Superconductors with Random Columnar Pins

Phys. Rev. Lett. 91, 127002 – Published 18 September 2003
Chandan Dasgupta and Oriol T. Valls

Abstract

We consider the melting of the vortex solid in highly anisotropic layered superconductors with a small concentration of random columnar pinning centers. Using large-scale numerical minimization of a free-energy functional, we find that melting of the low-temperature, nearly crystalline vortex solid (Bragg glass) into a vortex liquid occurs in two steps as the temperature increases: the Bragg glass and liquid phases are separated by an intermediate Bose glass phase. A suitably defined local melting temperature exhibits spatial variation similar to that observed in experiments.

DOI: http://dx.doi.org/10.1103/PhysRevLett.91.127002

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  • Received 11 April 2003
  • Published 18 September 2003

© 2003 The American Physical Society

Authors & Affiliations

Chandan Dasgupta1,2,* and Oriol T. Valls3,†

  • 1Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA
  • 2Department of Physics, Indian Institute of Science, Bangalore 560012, India
  • 3Department of Physics and Minnesota Supercomputer Institute, University of Minnesota, Minneapolis, Minnesota 55455-0149, USA

  • *Electronic address: cdgupta@physics.iisc.ernet.in
  • Electronic address: otvalls@umn.edu

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