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 URu_1.7Fe_1.3Si₂ — •Martin Sundermann^1,2,3, Andrea Amorese^1,2, Hasan Yavaş³, Pieter Glatzel⁴, Maurits W. Haverkort⁵, Brian Maple⁶, Liu Hao Tjeng², and Andrea Severing^1,2 — 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 — 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 0.4µ_B. 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 URu_1.7Fe_0.3Si₂ and compare these with results of URu₂Si₂.