2000/04/17 by W. Westerburg, Westerburg, W., O. Lang +20
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Solid-state spectroscopy and crystallography #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0004275
RevTeX, 8 pages, 12 EPS figures, 5 Tables, submitted to J. Phys.: Condens. Matter
arxiv created 2000/04/17 · openalex publication_date 2000/04/17 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We suceeded in the preparation of polycrystalline Ca2FeReO6 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 P21/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.