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Determining the local low-energy excitations in the Kondo semimetal CeRu4Sn6 using resonant inelastic x-ray scattering

Andrea Amorese, Kurt Kummer, Nicholas B. Brookes, Oliver Stockert, Devashibhai T. Adroja, André M. Strydom, Andrey Sidorenko, Hannes Winkler, Diego A. Zocco, Andrey Prokofiev, Silke Paschen, Maurits W. Haverkort, Liu Hao Tjeng, and Andrea Severing
Phys. Rev. B 98, 081116(R) – Published 27 August 2018
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Abstract

We have investigated the local low-energy excitations in CeRu4Sn6, a material discussed recently in the framework of strongly correlated Weyl semimetals, by means of Ce M5 resonant inelastic x-ray scattering (RIXS). The availability of both F522 and F722 excitations of the Ce 4f1 configuration in the spectra allows for the determination of the crystal-electric field (CEF) parameters that explain quantitatively the high-temperature anisotropy of the magnetic susceptibility. The absence of an azimuthal dependence in the spectra indicates that all CEF states are close to being rotational symmetric. We show further that the non-negligible impact of the Ǎ60 parameter on the ground state of CeRu4Sn6 leads to a reduction of the magnetic moment μc due to multiplet intermixing. This improves the agreement between CEF calculations and the experimentally determined magnetic susceptibility considerably at low temperatures. Deviations that persist at low temperatures for fields within the tetragonal plane are attributed to the Kondo interaction between 4f and conduction electrons. The RIXS results are consistent with inelastic neutron scattering data and are compared to the predictions from ab initio based electronic structure calculations.

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  • Received 13 June 2018
  • Revised 10 August 2018

DOI:https://doi.org/10.1103/PhysRevB.98.081116

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Andrea Amorese1,2, Kurt Kummer3, Nicholas B. Brookes3, Oliver Stockert2, Devashibhai T. Adroja4,5, André M. Strydom5, Andrey Sidorenko6, Hannes Winkler6, Diego A. Zocco6, Andrey Prokofiev6, Silke Paschen6, Maurits W. Haverkort7, Liu Hao Tjeng2, and Andrea Severing1,2

  • 1Institute of Physics II, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
  • 2Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, D-01187 Dresden, Germany
  • 3European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS40220, F-38043 Grenoble Cedex 9, France
  • 4ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon OX11 0QX, United Kingdom
  • 5Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
  • 6Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, A-1040 Vienna, Austria
  • 7Institute for Theoretical Physics, Heidelberg University, Philosophenweg 19, D-69120 Heidelberg, Germany

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Issue

Vol. 98, Iss. 8 — 15 August 2018

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