Magnetic and structural properties of the double-perovskite Ca_2FeReO_6

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dc.creatorWesterburg, W.
dc.creatorLang, O.
dc.creatorFelser, C.
dc.creatorTremel, W.
dc.creatorWaldeck, M.
dc.creatorRenz, F.
dc.creatorGuetlich, P.
dc.creatorRitter, C.
dc.creatorJakob, G.
dc.date2000-04-17
dc.date.accessioned2026-07-07T02:37:23Z
dc.date.available2026-07-07T02:37:23Z
dc.descriptionWe suceeded in the preparation of polycrystalline Ca_2FeReO_6 which has a Curie temperature of 540 K, the highest value of all magnetic perovskites investigated up to now. This material has been characterised by X-ray and neutron powder diffraction. We found at 548 K a monoclinic unit cell (space group P2_1/n) with a=5.4366(5) A, b=5.5393(5) A, c=7.7344(5) A, and beta=90.044(4) deg. For low temperatures a phase separation in two monoclinic phases with identical cell volume is observed in neutron scattering. The two phases possess different magnetic structure and coercivity. 57-Fe-Moessbauer spectroscopy measurements show the presence of four different Fe(3+) positions indicating two different phases at room temperature, indistinguishable in the diffraction experiments. The conductivity is thermally activated for all temperatures and no significant magnetoresistivity is observed.
dc.descriptionRevTeX, 8 pages, 12 EPS figures, 5 Tables, submitted to J. Phys.: Condens. Matter
dc.identifierhttps://arxiv.org/abs/cond-mat/0004275
dc.identifierhttp://arxiv.org/abs/cond-mat/0004275
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/16271
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleMagnetic and structural properties of the double-perovskite Ca_2FeReO_6
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