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Nature of long-range order in the vortex lattice of high-Tc superconductors

Recent neutron data on the disappearance of long-range order in the vortex lattice of BSCCO at fields of order 1 kGauss is interpreted in terms of the results of a monte carlo simulation of the thermodynamics of the vortex lattice in a pure system. We show that the neutron data is consistent with a disorder-driven phase transition from a vortex crystal at low fields to a vortex glass at higher fields.