Anomalous flux jump and supercooling phenomenon around the order-disorder transition in MgB2 single crystals

M. Chotoku, T. Nojima, A. Ochiai, H. Aoki, H. G. Lee, S. I. Lee

Research output: Contribution to journalArticle

Abstract

We have performed the detailed measurements of temperature dependence of magnetization M(T) on MgB2 single crystals in a wide range of field H using torque magnetometry. In a field region, where the peak effect in M(H) is observed, we find that M(T) of the warming branch increases monotonously with T and exhibits a small step-like increase at T1*, which is related to the order-disorder transition, while M(T) of the cooling branch, showing the larger values than that in warming branch below T1*, drops suddenly toward the warming branch at T2*. We ascribe this anomalous behavior of M(T) of the cooling branch to a supercooling phenomenon of disordered phase, which transforms to the ordered state at T2*.

Original languageEnglish
Pages (from-to)1132-1135
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - 2009 Oct 15

Keywords

  • MgB
  • Order-disorder transition
  • Single crystal
  • Vortex matter physics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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