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Interplay between structural instability and lattice dynamics in EuRh2(PxAs1x)2

A. Barla, M. Chefki, C. Huhnt, M. Braden, O. Leupold, R. Rüffer, J. P. Sanchez, A. Wurth, A. Mewis, and M. M. Abd-Elmeguid
Phys. Rev. B 69, 100102(R) – Published 22 March 2004
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Abstract

The interplay between the crystallographic structure, valence state, and lattice dynamics of the series EuRh2(PxAs1x)2 (x=0, 0.5, and 1) has been investigated using x-ray diffraction, the 151Eu Mössbauer effect, and the 151Eu nuclear inelastic scattering of synchrotron radiation, respectively. We show that the first-order, isostructural phase transition (αphaseβphase), which occurs at xc0.85, is not connected with a change of the Eu2+ valence state but is associated with a significant modification of the Eu partial phonon density of states (PDOS). Lattice dynamical calculations on EuRh2(PxAs1x)2 show that the observed change in the PDOS can be attributed to the structural change at the phase transition.

  • Received 30 October 2003

DOI:https://doi.org/10.1103/PhysRevB.69.100102

©2004 American Physical Society

Authors & Affiliations

A. Barla1, M. Chefki2, C. Huhnt2, M. Braden2, O. Leupold1, R. Rüffer1, J. P. Sanchez3, A. Wurth4, A. Mewis4, and M. M. Abd-Elmeguid2

  • 1European Synchrotron Radiation Facility, 6 rue Jules Horowitz, F-38043 Grenoble Cedex 9, France
  • 2II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
  • 3Département de Recherche Fondamentale sur la Matière Condensée, CEA Grenoble, 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France
  • 4Institut für Anorganische Chemie und Strukturchemie II, Universitätsstrasse 1, D-40225 Düsseldorf, Germany

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Issue

Vol. 69, Iss. 10 — 1 March 2004

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