Experimental evidence for a multicritical point in the magnetic phase diagram for the mixed state of clean untwinned
- 14 June 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 70 (24), 3800-3803
- https://doi.org/10.1103/physrevlett.70.3800
Abstract
We report on transport measurements in fields up to 16 T in clean, untwinned single crystals of which indicate that there is a critical end point for first-order melting in the H-T phase diagram in the mixed state of that system. Our data show that at a well defined value of the magnetic field, the phase boundary sharply changes slope where the first-order melting transition gives way to a second-order vortex-glass transition. These data suggest that the recently observed first-order transition is robust in the presence of a finite amount of disorder and that the vortex-glass transition only occurs for disorder beyond a certain critical amount.
Keywords
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