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Absence of orbital rotation in superconducting CeCu2Ge2

J.-P. Rueff, J. M. Ablett, F. Strigari, M. Deppe, M. W. Haverkort, L. H. Tjeng, and A. Severing
Phys. Rev. B 91, 201108(R) – Published 26 May 2015
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Abstract

We address the recently proposed orbital transition scenario in heavy fermion compounds exhibiting two superconducting domes. Our method of choice is nonresonant inelastic x-ray scattering (NIXS) which probes charge densities and can be modeled quantitatively. Our NIXS results of CeCu2Ge2, a model system of this class of materials, are well described by considering the same sequence of orbitals at all temperatures, thus putting into question whether orbital transitions are related to the formation of the second superconducting dome. The discrepancy between experimental findings and prediction could be due to the lack of accuracy in the theoretical description of the 4f states.

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  • Received 7 November 2014
  • Revised 30 April 2015

DOI:https://doi.org/10.1103/PhysRevB.91.201108

©2015 American Physical Society

Authors & Affiliations

J.-P. Rueff1,2,*, J. M. Ablett1, F. Strigari3, M. Deppe4, M. W. Haverkort4, L. H. Tjeng4, and A. Severing3

  • 1Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, Boîte Postale 48, 91192 Gif-sur-Yvette Cedex, France
  • 2Laboratoire de Chimie Physique–Matière et Rayonnement, CNRS-UMR 7614, Université Pierre et Marie Curie, F-75005 Paris, France
  • 3Institute of Physics II, University of Cologne, Zülpicher Straße 77, D-50937 Cologne, Germany
  • 4Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, D-01187 Dresden, Germany

  • *Corresponding author: jean-pascal.rueff@synchrotron-soleil.fr

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Issue

Vol. 91, Iss. 20 — 15 May 2015

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