Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: f-Electron Systems and Heavy Fermions I
TT 5.1: Vortrag
Montag, 12. März 2018, 09:30–09:45, H 3005
X-ray absorption study of Sn and Cd substituted CeCoIn5 — Kai Chen1,6, Fabio Strigari1, Martin Sundermann1,2,3, Stefano Agrestini2, Zhiwei Hu2, Davide Betto4, Kurt Kummer4, Javier Herrero5, Steffen Wirth2, and •Andrea Severing1,2 — 1University of Cologne, Institute of Physics II, Cologne, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 3PETRA III, Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — 4European Synchrotron Radiation Facility (ESRF), Grenoble, France — 5ALBA Synchrotron, Barcelona, Spain — 6present address: SOLEIL Synchrotron, Saclay, France
In a previous soft x-ray absorption investigation of the crystal-electric field wave function of the CeRh1−xIrxIn5 substitution series we showed that changes in the cerium wave function correlate with the phase diagram while these changes anticorrelate with the lattice anisotropy. Here we will present the crystal-electric field wave functions for two other related substitution series: CeCo(In1−xCdx)5 and CeCo(In1−ySny)5. The parent compound CeCoIn5 is an unconventional superconductor (Tc=2.3 K) with a field-induced antiferromagnetic quantum critical point inside the superconducting dome. The substitution of tiny amounts of In by Cd or Sn suppresses superconductivity. Sakai et al. suspected that Cd and Sn doping has a different impact on hybridization. Our soft x-ray absorption results strongly support this conjecture and show that M-edge XAS is a very sensitive probe of the direction dependence of hybridization.