Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: f-Electron Systems and Heavy Fermions 1

TT 34.8: Vortrag

Mittwoch, 18. März 2020, 11:30–11:45, HSZ 204

Investigation of Ce-based Materials with Multiple Inequivalent Kondo-sites.Jardoslav Valenta1, Petr Opletal1, Jan Fikáček1, Elen Duverger Nedellec1, Jiří Pospíšil1, Shinsaku Kambe2, Hironori Sakai2, Yo Tokunaga2, Russel E Walstedt3, Robert Küchler4, Jacintha Banda4, Manuel Brando4, and •Jeroen Custers11Dept. of Condensed Matter Physics, Charles University, Ke Karlovu, 5, 121 16 Praha, Czech Republic — 2Advanced Science Research Center, Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan — 3Physics Department, The University of Michigan, Ann Arbor, MI 48109, USA — 4Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187 Dresden, Germany

The vast majority of heavy fermion compounds investigated in close proximity to a magnetic quantum phase transition exhibit only one crystallographic site for the Rare Earth or Actinide ion. Here we present results on ongoing research on several Ce–based compounds with multiple Ce-sites. Recent 115In NQR/NMR results on Ce3PtIn11 which has two inequivalent Ce-sites, show evidence for two quantum critical points. Each can be associated with a particular Ce-site. Our investigation on a series of (Ce1−xLax)3Al11 reveals that, up to x = 0.25, we substitute La for Ce on the Ce2 site only. As the parent compound Ce3Al11 has 2 sites (Ce1: 2 atoms/f.u.; Ce2: 1 atom/f.u.) we thus can follow the evolution of removing one Kondo-site step by step. Finally we will present our first results on Ce3Rh5Ge7. This novel compound harbors 3 inequivalent Ce-sites.

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