Observation of vortex lattice melting in large untwinned YBa2Cu3O7-x single crystals
C. M. Aegerter, H. Keller, S. H. Lloyd, P. G. Kealey, E. M. Forgan, S. T. Johnson, T. M. Riseman, R. Cubitt, S. L. Lee, C. Ager, D. McK. Paul, I. M. Savic, M. Yethiraj, S. Tajima, A. Rykov
Abstract
We present a study of the vortex lattice in untwinned YBa2Cu3O7-x crystals, using a combination of muon spin rotation and neutron small angle scattering measurements. Both methods show a very sharp melting temperature consistent with a first order transition. The dependence of the melting temperature on the angle of the field with respect to the crystallographic c-axis is studied. The results are compared to thermal measurements.
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