High vortex mobility in Hg-1201

D. Maurer, H. Breitzke, K. Lüders, M. Baenitz, D. A. Pavlov, E. V. Antipov

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We report on detailed investigations of the mixed state in the mercury based high-Tc superconductor HgBa2CuO4 (Hg-1201) by means of ac and dc magnetization measurements. Over large parts of the superconducting phase diagram the vortex mobility turned out to be remarkably high. From knowledge of the phase boundaries and the irreversibility line also determined, it became clear that in Hg-1201 thermal activation strongly supports the flux diffusion in both liquid and solid vortex phases. Thermally assisted flux diffusion widely stops here only for temperatures well below the melting line. In particular, the strong decrease of vortex mobility within the solid phase suggests a transition between different regimes originating from a different nature of vortex pinning, i.e. collective or single, and indicates a weak to strong pinning crossover of vortex matter in pure Hg-1201. A phenomenological description of the flux dynamics based on the classic diffusion formalism has been performed.

Original languageEnglish
Article number150
Pages (from-to)613-617
Number of pages5
JournalJournal of Physics: Conference Series
Volume43
Issue number1
DOIs
Publication statusPublished - 1 Jun 2006
Externally publishedYes

Keywords

  • Hg-based high-T superconductors
  • Phase deagram
  • Vortex dynamics

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