Metallic and nonmetallic double perovskites: A case study of A2FeReO6 (A=Ca,Sr,Ba)

J. Gopalakrishnan, A. Chattopadhyay, S. B. Ogale, T. Venkatesan, R. L. Greene, A. J. Millis, K. Ramesha, B. Hannoyer, and G. Marest
Phys. Rev. B 62, 9538 – Published 1 October 2000
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Abstract

We have investigated the structure and electronic properties of ferrimagnetic double perovskites, A2FeReO6 (A=Ca,Sr,Ba). The A=Ba phase is cubic (Fm3m) and metallic, while the A=Ca phase is monoclinic (P21/n) and nonmetallic. 57Fe Mössbauer spectroscopy shows that iron is present mainly in the high spin (S=52) Fe3+ state in the Ca compound, while it occurs in an intermediate state between high spin Fe2+ and Fe3+ in the Ba compound. It is argued that a direct Ret2gRet2g interaction is the main cause for the metallic character of the Ba compound; the smaller size of Ca and the monoclinic distortion (which lifts the degeneracy of t2g states) seem to disrupt the Re-Re interaction in the case of the Ca compound, making it nonmetallic for the same electron count.

  • Received 18 April 2000

DOI:https://doi.org/10.1103/PhysRevB.62.9538

©2000 American Physical Society

Authors & Affiliations

J. Gopalakrishnan*, A. Chattopadhyay, S. B. Ogale, T. Venkatesan, and R. L. Greene

  • Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742

A. J. Millis

  • Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, New Brunswick, New Jersey 08854

K. Ramesha

  • Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India

B. Hannoyer

  • Laboratoire d’ Analyse Spectroscopique et de Traitement de Surface des Matériaux, Université de Rouen, 76821 Mont-Saint-Aignan Cedex, France

G. Marest

  • Institut de Physique Nucléaire de Lyon, IN2P3 et Université Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France

  • *Present address: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India.

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Vol. 62, Iss. 14 — 1 October 2000

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