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Magnetic and structural properties of the double-perovskite Ca_2FeReO_6

W. Westerburg·O. Lang·C. Felser·W. Tremel·M. Waldeck·F. Renz·P. Guetlich·C. Ritter·G. Jakob
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Abstract

We 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.

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W. Westerburg, O. Lang, C. Felser, W. Tremel, M. Waldeck, F. Renz, P. Guetlich, C. Ritter, G. Jakob. 2000-04-17. Magnetic and structural properties of the double-perovskite Ca_2FeReO_6. https://arxiv.org/abs/cond-mat/0004275

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