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Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: f-Electron Systems and Heavy Fermions II

TT 18.3: Talk

Monday, March 12, 2018, 15:30–15:45, H 3005

Kondo-lattice ferromagnets and their peculiar order along the magnetically hard axis — •Daniel Hafner1, Binod Rai2, Jacintha Banda1, Kristin Kliemt3, Cornelius Krellner3, Jörg Sichelschmidt1, Christoph Geibel1, Emilia Morosan2, and Manuel Brando11Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany — 2Physics and Astronomy Department, Rice University, Houston, Texas 77005, USA — 3Physikalisches Institut, Johann Wolfgang Goethe-Universität, D-60438 Frankfurt am Main, Germany

We show that ferromagnetism in Ce- and Yb- based Kondo-lattice systems often aligns along the magnetically hard axis. This counter-intuitive phenomenon was believed to be a rare case, but our comparative study suggests that this is rather the common case in these materials. We discuss possible theoretical scenarios by analyzing differences and similarities between all these systems. Differences appear in properties such as Curie temperatures TC, crystalline structures, size of the ordered magnetic moment and crystal electric field ground state. Similarities lie in a usual Kondo temperature TK of a few Kelvin, a comparable magnetic anisotropy and a non mean-field like transition in specific heat, hinting at an important role of fluctuations.

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