Observation of first-order transitions of the vortex lattice in MgB 2 single crystals

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Measurements of reversible magnetization have been performed on high quality MgB2 single crystals using torque magnetometry combined with the 'vortex shaking' technique. At high temperatures above 26 K, a step like decrease in the magnetization curve is observed at Hm with and without shaking. This anomaly can be ascribed to the first order vortex lattice melting transition. At low temperature below 25 K, where the irreversible magnetization curve reveals the peak effect, we succeed in suppressing the hysteresis completely by shaking and observing the clear step in the reversible magnetization curve at the field H* for the peak effect. The entropy change, estimated from the step of the reversible magnetization at Hm is 2-3 times larger than that at H*.

Original languageEnglish
Article number052189
JournalJournal of Physics: Conference Series
Volume150
Issue number5
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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