Strong coupling effects on the upper critical field of the heavy-fermion superconductor UBe13 |
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| Authors: | F Thomas B Wand T Lühmann P Gegenwart G R Stewart F Steglich J P Brison A Buzdin L Glémot J Flouquet |
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| Affiliation: | (1) Technische Hochschule Darmstadt, Hochulstr. 8, D-64289 Darmstadt, Germany;(2) Department of Physics, University of Florida, 32611 Gainesville, Florida;(3) Universität Augsburg, D-86159 Augsburg, Germany;(4) Centre de Recherches sur les Très Basses Températures, CNRS, BP 166, 38042 Grenoble-Cédex 9, France;(5) CEA, Département de Recherche Fondamentale sur la Matière Condensée, SPSMS/LCP, 38054 Grenoble-Cédex 9, France;(6) Institute for High Pressure Physics, 142092 Troitsk, Russia |
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| Abstract: | The upper critical fieldH
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 atT/T
C
 0.5 and a large saturated limit forT 0 ofH
c2
(0) = 14 T. The complete temperature dependence ofH
c2
(T) can be 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. |
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