Evidence from mechanical measurements for flux-lattice melting in single-crystal YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8

P. L. Gammel, L. F. Schneemeyer, J. V. Wasczak, D. J. Bishop

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Abstract

We have studied flux-lattice melting in single crystals of YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8 using a high-Q mechanical oscillator. In YBa2Cu3O7 with an applied magnetic field Hc^, flux-lattice melting occurs at Hc2 as in a conventional three-dimensional superconductor. However, for Hc^ flux-lattice melting occurs 3.2 K below Hc2. We believe that this is evidence for a transition into a vortex-liquid state similar to that seen in two-dimensional superconducting films. For Bi2.2Sr2Ca0.8Cu2O8 the effect is even more pronounced; with a bulk superconducting transition of 75 K, the flux-lattice melting in this material occurs in both orientations near 30 K.

Original languageEnglish
Pages (from-to)1666-1669
Number of pages4
JournalPhysical Review Letters
Volume61
Issue number14
DOIs
StatePublished - 1 Jan 1988

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