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Flux Line Lattice Melting Transition in YBa2Cu3O6.94 Observed in Specific Heat Experiments

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Science  30 Aug 1996:
Vol. 273, Issue 5279, pp. 1210-1212
DOI: 10.1126/science.273.5279.1210

Abstract

When a magnetic field penetrates a type II superconductor, it forms a lattice of thin quantized filaments called magnetic vortices. Resistance, magnetization, and neutron diffraction experiments have shown that the vortex lattice of high-temperature superconductors can melt along a line in the field-temperature plane. The calorimetric signature of melting on this line was observed in a high-accuracy adiabatic specific heat experiment performed on YBa2Cu3O6.94. The specific heat of the vortex liquid was greater than that of the vortex solid.

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