Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Correlated Electrons: Heavy Fermions

TT 8.11: Vortrag

Montag, 27. März 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.