Properties of the ferrimagnetic double perovskites A2FeReO6 (A= Ba and Ca)

Prellier, W. ; Smolyaninova, V. ; Biswas, Amlan ; Galley, C. ; Greene, R. L. ; Ramesha, K. ; Gopalakrishnan, J. (2000) Properties of the ferrimagnetic double perovskites A2FeReO6 (A= Ba and Ca) Journal of Physics: Condensed Matter, 12 (6). pp. 965-973. ISSN 0953-8984

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Ceramics of A2 FeReO6 double perovskites have been prepared and studied for A = Ba and Ca. Ba2FeReO6 has a cubic structure (Fm3m) with a ≈ 8.0854(1) Å whereas Ca2 FeReO6 has a monoclinic symmetry with a ≈ 5.396(1) Å, b ≈5.522(1) Å, c ≈ 7.688(2) Å and β= 90.4° (P21/n) . The barium compound is metallic from 5 K to 385 K, i.e. no metal - insulator transition has been seen up to 385 K, and the calcium compound is semiconducting from 5 K to 385 K. At 5 K, we observed a negative magnetoresistance of 10% in a magnetic field of 50 kOe for Ba2 FeReO6. Magnetization measurements show a ferrimagnetic behaviour for both materials, with Tc= 315 K for Ba2 FeReO6 and above 385 K for Ca2 FeReO6. A specific heat measurement on the barium compound gave an electron density of states at the Fermi level, N( EF), equal to 5.9 × 1024 eV-1 mol-1. Electrical, magnetic and thermal properties are discussed and compared to those of the analogous compounds Sr2 Fe(Mo,Re)O6.

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Deposited On:13 Nov 2010 13:30
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