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Properties of the Ferrimagnetic Double-Perovskites A2FeReO6 (A=Ba and Ca)

Published online by Cambridge University Press:  10 February 2011

W. Prellier ,
V. Smolyaninova ,
A. Biswas ,
C. Galley ,
R.L. Greene ,
K. Ramesha  and
J. Gopalakrishnan
W. Prellier
Affiliation:
Center for Superconductivity Research and Department of Physics, University of Maryland, College Park, MD 20472, USA Current address: Laboratoire CRISMAT-ISMRA, CNRS UMR 6508, 6 Bd. du Maréchal Juin, 14050 Caen, France
V. Smolyaninova
Affiliation:
Center for Superconductivity Research and Department of Physics, University of Maryland, College Park, MD 20472, USA
A. Biswas
Affiliation:
Center for Superconductivity Research and Department of Physics, University of Maryland, College Park, MD 20472, USA
C. Galley
Affiliation:
Center for Superconductivity Research and Department of Physics, University of Maryland, College Park, MD 20472, USA
R.L. Greene
Affiliation:
Center for Superconductivity Research and Department of Physics, University of Maryland, College Park, MD 20472, USA
K. Ramesha
Affiliation:
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
J. Gopalakrishnan
Affiliation:
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
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Abstract

We have synthesized ceramics of A2FeReO6 double-perovskites A2FeReO6 (A=Ba, Ca). Structural characterizations indicate a cubic structure with a=8.0854(1) Å for Ba2FeReO6 and a distorted monoclinic symmetry with a=5.396(1) Å, b=5.522(1) Å, c=7.688(2) Å and β=90.4° for Ca2FeReO6. The barium compound is metallic from 5K to 385K, i.e. no metal-insulator transition has been seen up to 385K, and the calcium compound is semiconducting from 5K to 385K. Magnetization measurements show a ferrimagnetic behavior for both materials, with Tc =315 K for Ba2FeReO6 and above 385K for Ca2FeReO6. At 5K we observed, only for Ba2FeReO6, a negative magnetoresistance of 10% in a magnetic field of 5T. Electrical, magnetic and thermal properties are discussed and compared to those of the analogous compounds Sr2Fe(Mo,Re)O6 recently studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 23
Copyright
Copyright © Materials Research Society 2000

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