The quasiorder-disorder phase transition and peak effect in MgB2 type-II superconducting materials and thin films

Ming Ju Chou, Herng-Er Horng

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    The peak effect and the quasiorder-disorder first-order phase transition for Magnesium diboride, MgB2, superconducting bulk materials have been studied. The peak values of the critical current density Jc, and the exact peak positions together with its corresponding half-widths for a constant temperature as well as for a constant applied magnetic field have been calculated by considering the quantum, thermal as well as random fluctuations of the vortex lattice. The results for MgB2 bulk materials are in agreement with the experiment. The peak effect for MgB2 superconducting thin films is also predicted theoretically. The expected peak effect may be observed provided that doping or other experimental techniques are applied to improve the flux pinning of the MgB2 superconducting thin films.

    Original languageEnglish
    Pages (from-to)128-135
    Number of pages8
    JournalAnnalen der Physik (Leipzig)
    Volume19
    Issue number1-2
    DOIs
    Publication statusPublished - 2010 Feb 1

    Keywords

    • Collective pinning
    • Intermetallic compound
    • Peak effect
    • Quasiorder-disorder phase transition

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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