Weak to strong pinning crossover in Hg-1201

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

Research output: Contribution to journalArticlepeer-review

3 Citations (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 B-T phase diagram the vortex mobility turned out to be remarkably high. From knowledge of the phase boundaries and the melting line, in particular, 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. The strong decrease of flux 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.

Original languageEnglish
Pages (from-to)219-223
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume445-448
Issue number1-2
DOIs
Publication statusPublished - 1 Oct 2006
Externally publishedYes

Keywords

  • Hg-based high-T superconductors
  • Phase diagram
  • Pinning

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