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

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

研究成果: Article査読

5 被引用数 (Scopus)

抄録

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*.

本文言語English
論文番号052189
ジャーナルJournal of Physics: Conference Series
150
5
DOI
出版ステータスPublished - 2009

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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