Anisotropy in the Superconductivity of Deformed Re Single Crystals

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Abstract
Single crystals of rhenium with a resistivity ratio (ρ300°K/ρ4.2°K) of approximately 1500 were grown by the floating-zone technique. The crystals were then deformed by tension. Samples were selected where the deformation took place primarily on one slip system, i.e., on the (101̄0) slip plane along the slip direction. Measurements of the resistance were made to determine the variation of the critical current with applied magnetic field. The deformed samples revealed an anisotropy in the transition field (the transition field being the field at which the smallest measureable amount of normality is observed) increasing with decreasing current as one approaches the range where filamentary conduction is important. The transition field was a minimum when the field was perpendicular to the active slip plane. The anisotropy at low current disappeared upon annealing the samples at 2700°C for 1.5 h and only the demagnetization effects remained. These results can be interpreted in terms of the anisotropic dislocation density introduced by this particular deformation.