Multigap Superconductivity in the Heavy Fermions PrOs4Sb12 and CeCoIn5: a thermal transport study at very low temperatures - Softcover

SEYFARTH, Gabriel

Softcover

ISBN 10: 3838312619 ISBN 13: 9783838312613

Publisher: LAP Lambert Academic Publishing, 2009

Synopsis

In this work we report thermal conductivity 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 thermal contact resistances on the setup. A strong increase in the low temperature field dependence of thermal conductivity in PrOs4Sb12 and CeCoIn5 reveals the existence of a characteristic field scale much smaller than the upper critical field Hc2. This high field sensitivity of heat transport does not correspond to predictions for ordinary type II or unconventional superconductors with gap nodes, but rather supports a multigap superconductivity scenario, reminiscent of the case of MgB2. Moreover, in PrOs4Sb12, the temperature dependence of thermal conductivity 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.

About this title

About the Author

Born 1978 in Munich, studies of physics/engineering in Ilmenau, Karlsruhe and Grenoble 1998-2004, PhD 2006 with J.P. Brison, Néel Institute-Grenoble on thermal transport in Heavy Fermion superconductors. Postdocs: University of California (single crystal growth with Z. Fisk/A. Bianchi) & University of Geneva (high pressure studies with D. Jaccard)

Edition details

• Publisher: LAP Lambert Academic Publishing
• Publication date: 2009
• ISBN 10: 3838312619
• ISBN 13: 9783838312613
• Binding: Paperback
• Language: English
• Number of pages: 168