Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.47: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Uniaxial pressure effects on the superconductivity of CeCoIn5 — •Kai Grube1, Sebastian Zaum1,2, Roland Schäfer1, Eric D. Bauer3, Christoph Meingast1, and Hilbert v. Löhneysen1,2 — 1Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe, Germany — 3Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
The heavy-fermion superconductor CeCoIn5 shows strongly anisotropy thermodynamic and transport properties due to its tetragonal crystal structure. A comparison with its cubic parent compound CeIn3, with an order of magnitude smaller transition temperature Tc, suggests the importance of anisotropy for the superconducting pairing mechanism in these alloys. We have performed thermal expansion and magnetostriction measurements along the a- and c-axes of CeCoIn5 single crystals. From measurements transverse and longitudinal to magnetic fields up to B = 14 T, it has been possible to calculate the uniaxial pressure effects on the superconductivity, dTc/dpi (i = a, c) and dBc2/dpi, and the Grüneisen parameters, Γa(T,B) and Γc(T,B). We will discuss the stress and strain dependences of the characteristic energy scales and relate them to the effects of hydrostatic pressure, magnetic field, and doping.