Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819347 | Physica C: Superconductivity and its Applications | 2009 | 4 Pages |
Abstract
We have studied the order-disorder transition in high quality MgB2 single crystals, using a torque magnetometry combined with a 'vortex shaking' technique. In the wide range of temperature T, field H and the H direction, we succeed in obtaining reversible magnetization curves Mrev(T, H) by shaking the pinned vortices. Especially at low temperatures below 25Â K and high fields, where the irreversible magnetization curve exhibits the peak effect due to the order-disorder transition, it is found that the peak is transformed into the clear step in Mrev(H). Similar step-like behavior is also observed in the temperature dependence of magnetization Mrev(T). These results give direct evidence that the order-disorder transition, which is hidden by the large hysteresis of magnetization, has the nature of first-order transition.
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
T. Nojima, K. Takahashi, M. Chotoku, A. Ochiai, H. Aoki, H.-G. Lee, S.-I. Lee,