Phys. Rev. Lett. 76, 835–838 (1996)Discontinuity of Reversible Magnetization in Untwinned YBCO Single Crystals at the First Order Vortex Melting TransitionReceived 26 June 1995; published in the issue dated 29 January 1996 We report magnetization measurements on clean and untwinned YBa2Cu3O6.95 single crystals with extremely low pinning. For the first time, an irreversibility line well below the vortex melting line has been achieved. A discontinuity in the magnetization at the vortex melting transition is observed, indicating a first order transition. The entropy change at the phase transition is 0.8kB per vortex per CuO2 double layer at 10 kOe and 0.6kB per vortex per CuO2 double layer at 40 kOe, in reasonable agreement with theoretical calculations. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.835
DOI:
10.1103/PhysRevLett.76.835
PACS:
74.60.Ge, 74.25.Ha, 74.72.Bk
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