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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 18.7: Talk

Monday, March 12, 2018, 16:45–17:00, H 3005

Bulk sensitive probe of 5f occupation and charge density in URu2Si2 and URu1.7Fe1.3Si2 — •Martin Sundermann1,2,3, Andrea Amorese1,2, Hasan Yavaş3, Pieter Glatzel4, Maurits W. Haverkort5, Brian Maple6, Liu Hao Tjeng2, and Andrea Severing1,21University 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 — 5Institute for Theoretical Physics, Heidelberg University, Heidelberg, Germany — 6University of California, San Diego, La Jolla, California, USA

URu2Si2 goes into a nonmagnetic hidden order (HO) phase at 17.7 K and becomes superconducting below 1.5K. The order parameter of the second-order phase transition into the HO phase in URu2Si2 is still a mystery, despite 30 years of research. Interestingly, with applied pressure (p ≥ 0.7GPa) the HO is replaced with antiferromagnetic order with large ordered moments of 0.4µB. This phase can also be reached by substitution of Fe on the Ru site. In the Fe substituted samples the ordered moment is even larger. Here we have addressed the questions whether the 5f occupation and/or the ground state wave function change with Fe substitution. We will present high energy resolution fluorescence detection M-edge and non-resonant inelastic x-ray scattering O-edge data of URu1.7Fe0.3Si2 and compare these with results of URu2Si2.

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