Spectroscopic determination of crystal-field levels in CeRh2Si2 and CeRu2Si2 and of the 4f0 contributions in CeM2Si2 (M=Cu, Ru, Rh, Pd, and Au)

T. Willers, D. T. Adroja, B. D. Rainford, Z. Hu, N. Hollmann, P. O. Körner, Y.-Y. Chin, D. Schmitz, H. H. Hsieh, H.-J. Lin, C. T. Chen, E. D. Bauer, J. L. Sarrao, K. J. McClellan, D. Byler, C. Geibel, F. Steglich, H. Aoki, P. Lejay, A. Tanaka, L. H. Tjeng, and A. Severing
Phys. Rev. B 85, 035117 – Published 18 January 2012

Abstract

We have determined the ground-state wave functions and crystal-field-level schemes of CeRh2Si2 and CeRu2Si2 using linear polarized soft x-ray-absorption spectroscopy (XAS) and inelastic neutron scattering. We find large crystal-field splittings and ground-state wave functions which are made of mainly Jz = |±5/2 with some amount of |3/2 in both the compounds. The 4f0 contribution to the ground state of several members of the CeM2Si2 family with M=(Cu, Ru, Rh, Pd, and Au) has been determined with XAS, and the comparison reveals a trend concerning the delocalization of the f electrons. Absolute numbers are extracted from scaling to results from hard x-ray photoelectron spectroscopy on CeRu2Si2 by Yano et al. [Phys. Rev. B 77, 035118 (2008)].

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  • Received 26 August 2011

DOI:https://doi.org/10.1103/PhysRevB.85.035117

©2012 American Physical Society

Authors & Affiliations

T. Willers1, D. T. Adroja2, B. D. Rainford3, Z. Hu4, N. Hollmann4, P. O. Körner1,*, Y.-Y. Chin4, D. Schmitz5, H. H. Hsieh6, H.-J. Lin7, C. T. Chen7, E. D. Bauer8, J. L. Sarrao8, K. J. McClellan8, D. Byler8, C. Geibel4, F. Steglich4, H. Aoki9, P. Lejay10, A. Tanaka11, L. H. Tjeng4, and A. Severing1

  • 1Institute of Physics 2, University of Cologne, Zülpicher Straße 77, DE-50937 Cologne, Germany
  • 2ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, England, United Kingdom
  • 3Department of Physics and Astronomy, Southampton University, Southampton SO17 1BJ, England, United Kingdom
  • 4Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, DE-01187 Dresden, Germany
  • 5Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY 2, Albert-Einstein-Straße 15, DE-12489 Berlin, Germany
  • 6Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan
  • 7National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan
  • 8Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 9Graduate School of Science/Center for Low Temperature Science, Tohoku University, Aramaki-aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
  • 10Institut Néel, Centre National de la Recherche Scientifique, BP 166, FR-38042 Grenoble Cedex 9, France
  • 11Department of Quantum Matter, ADSM Hiroshima University, Higashi-Hiroshima 739-8530, Japan

  • *Present address: Institute for Physical Chemistry, University of Cologne, Luxenburger Str. 166, DE-50939 Cologne, Germany.

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Vol. 85, Iss. 3 — 15 January 2012

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