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TT: Tiefe Temperaturen
TT 8: Correlated Electrons: Heavy Fermions
TT 8.11: Talk
Monday, March 27, 2006, 17:15–17:30, HSZ 301
Low-energy interactions in the heavy-fermion state of Ce3Rh4Sn13 — •Ulrike Köhler1, André Strydom2, Adam Pikul1, Silke Paschen3, Niels Oeschler1, and Frank Steglich1 — 1MPI CPfS, Nöthnitzer Straße 40, 01187 Dresden, Germany — 2Physics Dept., University of Johannesburg, South Africa — 3Institut für Festkörperphysik, TU Wien, Austria
Previous magnetization measurements on Ce3Rh4Sn13 were reported with a Curie-Weiss behaviour and a small Weiss temperature of -14 K. No magnetic ordering was observed down to 2 K. The resistivity displayed a negative temperature coefficient from room temperature down to 4.2 K apart from a minimum near 30 K, which was attributed to Kondo interactions. These intriguing properties, together with the lack of any thermodynamic data on Ce3Rh4Sn13 prompted us to study this compound by magnetization, resistivity, Hall effect, specific heat and thermal transport between 40 mK and 300 K and in applied magnetic fields. The results point to the relevance of a particularly small crystal-electric field splitting together with a low-temperature Kondo interaction, both of which become evanescent in the ground state of strongly correlated electrons in Ce3Rh4Sn13.