Spin-orbital ordering and mesoscopic phase separation in the double perovskite Ca2FeReO6

Granado, E and Huang, Q and Lynn, JW and Gopalakrishnan, J and Greene, RL and Ramesha, K (2002) Spin-orbital ordering and mesoscopic phase separation in the double perovskite Ca2FeReO6. In: Physical Review B: Condensed Matter and Materials Physics, 66 (6). 064409.

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Abstract

Neutron powder diffraction measurements on Ca2FeReO6 reveal that this double perovskite orders ferrimagnetically and shows anomalous lattice parameter behavior below T-C=521 K. Below similar to300 K and similar to160 K we observe that the high-T monoclinic crystal structure separates into two and three monoclinic phases, respectively. A magnetic field suppresses the additional phases at low T in favor of the highest-T phase. These manifestations of the orbital degree of freedom of Re 5d electrons indicate that these electrons are strongly correlated and the title compound is a Mott insulator, with competing spin-orbitally ordered states.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	28 Jul 2011 06:43
Last Modified:	28 Jul 2011 06:43
URI:	http://eprints.iisc.ac.in/id/eprint/39407

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