Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.12: Poster
Montag, 31. März 2014, 15:00–19:00, P2
Effect of reduced dimensionality on superconductivity in CeCoIn5 probed by thermal expansion and magnetostriction measurements — •Kai Grube1, Sebastian Zaum1,2, Felix Eilers1, Roland Schäfer1, Eric D. Bauer3, Joe D. Thompson3, and Hilbert v. Löhneysen1,2 — 1Karlsruhe Institute of Technology, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Karlsruhe Institute of Technology, Physikalisches Institut, 76131 Karlsruhe, Germany — 3Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
In CeCoIn5, a route towards reduced dimensionality is provided by an elongation of the unit cell along the c-axis. To determine the related strain dependences of Tc and Bc2, we measured thermal expansion and magnetostriction of CeCoIn5 single crystals. The dependence of the strong-coupling parameter was estimated by the ratio between specific heat discontinuity at Tc and Sommerfeld coefficient. Our results show that Bc2 grows with increasing c-axis lattice parameter due to an increase of the strong coupling nature of the superconductivity. This is in agreement with a recent study on artificial superlattices of alternating superconducting CeCoIn5 and metallic YbCoIn5 layers in which reducing dimensionality increases the ratio Bc2/Tc [1].
Y. Mizukami et al., Nature Phys. 7, 849 (2011).