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Pressure-induced insulating state in (La,Sr)CoO3

R. Lengsdorf, M. Ait-Tahar, S. S. Saxena, M. Ellerby, D. I. Khomskii, H. Micklitz, T. Lorenz, and M. M. Abd-Elmeguid
Phys. Rev. B 69, 140403(R) – Published 6 April 2004
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Abstract

We have investigated the effect of pressure on the electronic, magnetic, and structural properties on a single crystal of conducting, ferromagnet (TC=157K) La0.82Sr0.18CoO3 located near the boundary of the metal-insulator transition. Contrary to the results reported on related systems, we find a transition from the conducting state to an insulating state and a decrease of TC with increasing pressure while the lattice structure remains unchanged. We show that this unusual behavior is driven by a gradual change of the spin state of Co3+ ions from magnetic intermediate-spin (t2g5eg1;S=1) to a nonmagnetic low-spin (t2g6eg0;S=0) state.

  • Received 19 December 2003

DOI:https://doi.org/10.1103/PhysRevB.69.140403

©2004 American Physical Society

Authors & Affiliations

R. Lengsdorf1, M. Ait-Tahar1, S. S. Saxena2, M. Ellerby3, D. I. Khomskii1,4, H. Micklitz1, T. Lorenz1, and M. M. Abd-Elmeguid1

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
  • 2Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CD3 0HE, United Kingdom
  • 3Department of Physics and Astronomy, University College of London, Gower Street, London WC IE6BT, United Kingdom
  • 4Laboratory of Solid State Physics, Groningen University, Nijenborgh 4, 9722 AG Groningen, The Netherlands

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Vol. 69, Iss. 14 — 1 April 2004

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