Strong coupling effects on the upper critical field of the heavy-fermion 
superconductor UBe13

Thomas, F.; Wand, B.; Lühmann, T.; Gegenwart, P.; Stewart, G. R.; Steglich, F.; Brison, J. P.; Buzdin, A.; Glémot, L.; Flouquet, J.

doi:10.1007/BF00755113

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Strong coupling effects on the upper critical field of the heavy-fermion superconductor UBe₁₃

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Citation

Thomas, F., Wand, B., Lühmann, T., Gegenwart, P., Stewart, G. R., Steglich, F., et al. (1996). Strong coupling effects on the upper critical field of the heavy-fermion superconductor UBe₁₃. Journal of Low Temperature Physics, 102(1-2), 117-132. doi:10.1007/BF00755113.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-E631-A

Abstract

The upper critical field H-c2(T) of a high quality single crystal of UBe13 is studied with very low noise resistivity measurements. It shows a large but finite slope of -45 T/K, an unusual temperature dependence with an inflexion point at T/T-c similar to 0.5 and a large saturated limit for T-->0 of can be H-c2(0) = 14 T. The complete temperature dependence of H-c2(T) described by a simple model of strong coupling superconductor, assuming a full Pauli limitation and the occurence of a non-uniform superconducting state (FFLO state) at low temperature.