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Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: f-Electron Systems and Heavy Fermions I

TT 5.11: Vortrag

Montag, 12. März 2018, 12:30–12:45, H 3005

Optical response of Cerium-based clathratesFarzaneh Zamani1, •Stefan Kirchner2, and Silke Paschen31Physikalisches Institut and Bethe Center for Theoretical Physics, Universität Bonn, Germany — 2Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang 310058, China — 3Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria

Clathrates are a class of caged compounds that display a wide range of physical properties as a function of host-guest composition. Cerium-based type-I clathrates are of particular interest due to their unusual thermoelectric properties with potential for application[1]. The origin of the observed thermopower enhancement at comparatively high temperature in CeBa7Au6Si40, however, is still a matter of debate. While Kondo scattering does occur in the system, Curie-Weiss behavior prevails down to about 1K. In order to understand the role of the rattling modes in the thermopower enhancement we address the optical response of CeBa7Au6Si40. In particular, we investigate if a model of phonon-enhanced Kondo scattering can explain the differences observed [2] in the optical conductivity of CeBa7Au6Si40 and its rare-earth free reference compound.
A. Prokofiev et al.,Nature Mat. 12, 1096-1101 (2013).
G. Johnstone et al., unpublished.

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