Supercooling of the disordered vortex lattice in Bi_2Sr_2CaCu_2O_8+d

Abstract

Time-resolved local induction measurements near to the vortex lattice order-disorder transition in optimally doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ single crystals shows that the high-field, disordered phase can be quenched to fields as low as half the transition field. Over an important range of fields, the electrodynamical behavior of the vortex system is governed by the co-existence of the two phases in the sample. We interpret the results in terms of supercooling of the high-field phase and the possible first order nature of the order-disorder transition at the ``second peak''.

4 pages, 3 figures. Submitted to Nature, July 10th, 1999; Rejected August 8th for lack of broad interest Submitted to Physical Review Letters September 10th, 1999

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