Systematic experiments on the transition to the normal state in superconducting tantalum single crystals doped with interstitially dissolved nitrogen impurities are presented. On the low-κ side of the magnetic phase diagram, where at some low temperature 0 <T * <T ca transition from type I to type II superconductivity occurs, a new effect has been observed, as reported briefly elsewhere: because of the correlation ofH c 2 with crystal directions, at fixed temperatures nearT *, whether the sample is a type I or a type II superconductor depends on which crystal direction is oriented parallel to the external field. In the type II superconducting range all samples display anH c 2 anisotropy effect, which is commonly observed in cubic superconductors, even in the extreme dirty limit (α~12). However, the second anisotropy coefficient (l = 6 component) is found to be negligibly small in all tantalum samples.
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Sporna, J.F., Seidl, E. & Weber, H.W. Anisotropy of the superconductive to normal transition in tantalum-nitrogen single crystals. J Low Temp Phys 37, 639–661 (1979). https://doi.org/10.1007/BF00113876
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DOI: https://doi.org/10.1007/BF00113876