Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 34.8: Talk

Wednesday, March 18, 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 Custers¹ — ¹Dept. 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 (Ce_1−xLa_x)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.