A Ferrimagnetic Manganese Oxide with a Layered Perovskite Structure: YBaMn2O5

Authors

  • Jon P. Chapman,

    1. IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 OHE (UK)
    2. Department of Chemistry, Lensfield Road, University of Cambridge, Cambridge CB2 1EW (UK), Fax: Int. code +(1223) 336362, e-mail: jpa14@cam.ac.uk
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  • Dr. J. Paul Attfield,

    Corresponding author
    1. IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 OHE (UK)
    2. Department of Chemistry, Lensfield Road, University of Cambridge, Cambridge CB2 1EW (UK), Fax: Int. code +(1223) 336362, e-mail: jpa14@cam.ac.uk
    • IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 OHE (UK) and Department of Chemistry, Lensfield Road, University of Cambridge, Cambridge CB2 1EW (UK), Fax: Int. code +(1223) 336362, e-mail: jpa14@cam.ac.uk
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  • Dr. Michele Molgg,

    1. BICC Cables Ltd., Superconductivity Group, Hedgeley Road, Hebburn, Tyne & Wear NE31 1XR (UK)
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  • Dr. Chris M. Friend,

    1. BICC Cables Ltd., Superconductivity Group, Hedgeley Road, Hebburn, Tyne & Wear NE31 1XR (UK)
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  • Dr. Tim P. Beales

    1. BICC Cables Ltd., Superconductivity Group, Hedgeley Road, Hebburn, Tyne & Wear NE31 1XR (UK)
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  • We thank A. Tyler (IRC), Dr. G. Wltschek (IRC) and Dr. L. Le Lay (BICC) for assistance with measurements. J. P. C. thanks BICC Cables Ltd. and the UK Engineering and Physical Sciences Research Council for a CASE studentship. This work was funded by BICC Cables Ltd. and the European Union under contract BRE2-CT93-3035.

Abstract

original image

A structure reminiscent of the YBa2Cu3O7 superconductor is shown by the novel reduced manganese perovskite YBaMn2O5 (on the right), in which double layers of MnO5 square pyramids enclose the Ba2+ ions (large spheres), while Y3+ ions (medium-sized black spheres) lie between the layers. Unlike many oxidized Mn perovskites, YBaMn2O5 does not exhibit magnetoresistive effects. Instead a ferrimagnetic transition occurs at 167 K which may be due to Mn2+/Mn3+ valence and spin ordering.

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