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Multiband Superconductivity in the Heavy Fermion compounds PrOs4Sb12 and CeCoIn5

Abstract : In this thesis, we present thermal conductivity (κ)
measurements on the heavy fermion superconductors
PrOs4Sb12 (Tc~1.75K) and CeCoIn5 (Tc~2.35K). After an introduction to these compounds, particular emphasis is put on the experimental technique, which has allowed reliable measurements down to 10mK and in magnetic fields up to 6.5T. As an original part of this work, we developed a method to fully characterize (quantitatively) the electric and thermal contact resistances on the setup.

A strong increase in the low temperature field dependence of κ in PrOs4Sb12 and CeCoIn5 reveals the
existence of a characteristic field scale much smaller than Hc2. This high field sensitivity of κ does not
correspond to predictions for ordinary type II or unconventional superconductors with gap nodes, but rather supports a multiband superconductivity scenario, reminiscent of the case of MgB2.
Moreover, in PrOs4Sb12, the temperature dependence
of κ points to fully open gaps on the whole Fermi
surface, whereas strong suppression of inelastic scattering impedes any conclusion on the gap topology on CeCoIn5.
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Contributor : Gabriel Seyfarth <>
Submitted on : Thursday, January 11, 2007 - 3:29:15 PM
Last modification on : Friday, December 18, 2020 - 1:34:03 PM
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  • HAL Id : tel-00123887, version 1




Gabriel Seyfarth. Multiband Superconductivity in the Heavy Fermion compounds PrOs4Sb12 and CeCoIn5. Superconductivity [cond-mat.supr-con]. Université Joseph-Fourier - Grenoble I, 2006. English. ⟨tel-00123887⟩



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