Half-Metallicity in Pb2CoReO6 Double Perovskite and High Magnetic Ordering Temperature in Pb2CrReO6 Perovskite
Source abstract
Abstract
Pb 2 MReO 6 (M = Co, Cr) perovskites were prepared by high pressure–high temperature method. Rietveld refinements of synchrotron powder X-ray diffraction show that the crystal structure of Pb 2 CoReO 6 is trigonal (space group R -3) with almost complete ordering of Co and Re cations, while Pb 2 CrReO 6 (space group Pm-3m ) is a cubic perovskite with one single site for Cr and Re atoms. The difference between the symmetry and the degree of order was further clarified by X-ray absorption spectroscopy that establishes formal oxidation states in these phases as Pb 2 Co 2+ Re 6+ O 6 and Pb 2 Cr 3+ Re 5+ O 6 . Pb 2 CrReO 6 is a simple perovskite with a high magnetic ordering temperature of 643 K. Pb 2 CoReO 6 is a double perovskite with −23% high field negative magnetoresistance at 10 K and 9 T. First-principles calculations of Pb 2 CoReO 6 indicate a half metallic electronic structure.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Multiferroics and related materials · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, United States
Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794, United States
Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, United States
Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9 West, PO Box 1000, Palisades, New York 10964, United States
Funding
Ministerio de Economía y Competitividad · Det Frie Forskningsråd · U.S. Department of Defense · Division of Materials Research
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