New Stacking Variations of the Charge and Orbital Ordering in the Metal-Ordered Manganite YBaMn_2O_6

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Author(s)

    • Kageyama H. KAGEYAMA H.
    • Material Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo
    • Nakajima T. NAKAJIMA T.
    • Material Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo
    • UEDA Y.
    • Material Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo
    • YOSHIZAWA H.
    • Neutron Scattering Laboratory, Institute for Solid State Physics, The University of Tokyo
    • OHOYAMA K.
    • Institute for Materials Research, Tohoku University

Abstract

We performed transmission electron microscopy (TEM) and powder neutron diffraction experiments on an <I>A</I>-site ordered manganese perovskite YBaMn<SUB>2</SUB>O<SUB>6</SUB> which undergoes unusual and multiple phase transitions. In the paramagnetic insulating phase, the so-called <I>CE</I> type of charge and orbital ordering was observed in the monoclinic <I>a</I>–<I>b</I> plane, which has been frequently observed for the ordinary solid solution of <I>A</I><SUB>1−<I>x</I></SUB><SUP>3+</SUP><I>A<SUB>x</SUB></I><SUP>′2+</SUP>MnO<SUB>3</SUB> around <I>x</I>=0.5. TEM revealed, however, a fourfold periodicity along the <I>c</I> axis, suggesting a new stacking pattern, in which planes of the <I>CE</I> type are built up according to the sequence [ααββ…]. Interestingly, when the system entered the antiferromagnetic state below 195 K, this stacking pattern changed into [αααα…] or [αβαβ…], suggesting a close interplay between spins and orbitals. The obtained stacking patterns were strongly correlated to the inherent structural alternation, i.e., the Y/Ba order along the <I>c</I> axis.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 72(2), 241-244, 2003-02-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110001954397
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00319015
  • NDL Article ID
    6444689
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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