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Selective spin-state switch and metal-insulator transition in GdBaCo2O5.5

C. Frontera, J. L. García-Muñoz, A. Llobet, and M. A. G. Aranda
Phys. Rev. B 65, 180405(R) – Published 26 April 2002
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Abstract

Ultrahigh resolution synchrotron diffraction data for GdBaCo2O5.5 throw new light on the metal-insulator transition of Co3+ Ba-cobaltites. An anomalous expansion of CoO6 octahedra is observed at the phase transition on heating, while CoO5 pyramids show the normal shrinking at the closing of the gap. The insulator-to-metal transition is attributed to a sudden excitation of some electrons in the octahedra (t2g6 state) into the Co eg band (final t2g4eg2 state). The t2g5eg1 state in the pyramids does not change and the structural study also rules out a d3x2r2/d3y2r2 orbital ordering at TMI.

  • Received 8 January 2002

DOI:https://doi.org/10.1103/PhysRevB.65.180405

©2002 American Physical Society

Authors & Affiliations

C. Frontera1, J. L. García-Muñoz1, A. Llobet2, and M. A. G. Aranda3

  • 1Institut de Ciència de Materials de Barcelona, CSIC, Campus universitari de Bellaterra, E-08193 Bellaterra, Spain
  • 2Laboratoire de Magnetisme Louis Néel, CNRS 25 Avenue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France
  • 3Departamento de Química Inorgánica, Cristalografía y Mineralogía Universidad de Málaga, 29071 Málaga, Spain

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Vol. 65, Iss. 18 — 1 May 2002

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