Competition between columnar pins and vortex screening: A doubly reentrant phase diagram

Ajay Nandgaonkar, D. G. Kanhere, and Nandini Trivedi
Phys. Rev. B 66, 104527 – Published 30 September 2002
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Abstract

We study the phase diagram of flux lines in superconductors with columnar pins. Based on numerical exact diagonalization simulations on small clusters, we get two phases of vortices: A low-temperature pinned glass with diverging tilt modulus and a high-temperature delocalized entangled vortex liquid. For random potential disorder we find a new phase transition temperature TBG from a pinned Bose glass to an entangled liquid that reduces with increasing vortex density. This occurs primarily because vortices screen the disorder potential and generate an effective weaker random potential with increasing vortex density. For a fixed fraction of randomly placed attractive columnar pins, we find a Mott-insulating phase when the vortex density exactly matches the density of pins at the matching field B=Bφ. We also find a transition from a strongly pinned Bose glass for B<Bφ to a weakly pinned Bose glass for B>Bφ as the vortex density is varied.

  • Received 20 November 2001

DOI:https://doi.org/10.1103/PhysRevB.66.104527

©2002 American Physical Society

Authors & Affiliations

Ajay Nandgaonkar1, D. G. Kanhere1, and Nandini Trivedi2

  • 1Department of Physics, University of Pune, Pune 411007, India
  • 2Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai 400005, India

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Vol. 66, Iss. 10 — 1 September 2002

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