Temperature- and pressure-induced spin-state transitions in LaCoO3

György Vankó, Jean-Pascal Rueff, Aleksi Mattila, Zoltán Németh, and Abhay Shukla
Phys. Rev. B 73, 024424 – Published 26 January 2006

Abstract

We report the continuous variation of the spin moment of cobalt in LaCoO3 across its temperature and pressure-induced spin transitions evidenced with Kβ emission spectra. The first thermal transition is best described by a transition to an orbitally nondegenerate intermediate spin (S=1) state. In parallel, continuous redistribution of the 3d electrons is also indicated by partial fluorescence yield x-ray absorption spectra. At high pressure, our study confirms that the material becomes low spin between 40 and 70 kbar at room temperature.

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  • Received 26 September 2005

DOI:https://doi.org/10.1103/PhysRevB.73.024424

©2006 American Physical Society

Authors & Affiliations

György Vankó1, Jean-Pascal Rueff2, Aleksi Mattila3, Zoltán Németh4, and Abhay Shukla5

  • 1European Synchrotron Radiation Facility, Boîte Postale 220 F-38043 Grenoble Cedex 9, France
  • 2Laboratoire de Chimie Physique - Matière et Rayonnement (UMR CNRS 7614), Université Paris 6, 11 rue Pierre et Marie Curie, F-75231 Paris Cedex 05, France
  • 3Division of X-ray Physics, Department of Physical Sciences, P.O. Box 64, FIN-00014, University of Helsinki, Finland
  • 4Department of Nuclear Chemistry, Eötvös Loránd University, Pázmány sétány 1/A, H-1118 Budapest, Hungary
  • 5Institut de Minéralogie et de Physique des Milieux Condensées, Université Pierre et Marie Curie, 4 place Jussieu, F-75252 Paris Cedex 05, France

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Issue

Vol. 73, Iss. 2 — 1 January 2006

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