A-site Randomness Effect on Structural and Physical Properties of Ba-based Perovskite Manganites

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Abstract

The discovery of novel structural and physical properties in the <I>A</I>-site ordered manganite <I>R</I>BaMn<SUB>2</SUB>O<SUB>6</SUB> (<I>R</I>=Y and rare earth elements) has demanded new comprehension about perovskite manganese oxides. In the present study, the <I>A</I>-site disordered form, <I>R</I><SUB>0.5</SUB>Ba<SUB>0.5</SUB>MnO<SUB>3</SUB>, has been investigated and compared with both <I>R</I>BaMn<SUB>2</SUB>O<SUB>6</SUB> and <I>R</I><SUB>0.5</SUB><I>A</I><SUB>0.5</SUB>MnO<SUB>3</SUB> (<I>A</I>: Sr, Ca) in the structures and electromagnetic properties. <I>R</I><SUB>0.5</SUB>Ba<SUB>0.5</SUB>MnO<SUB>3</SUB> has a primitive cubic perovskite cell in the structure and magnetic glassy states are dominant as its ground state, in contrast to the ordinary disordered <I>R</I><SUB>0.5</SUB><I>A</I><SUB>0.5</SUB>MnO<SUB>3</SUB> (<I>A</I>: Sr, Ca). In Pr-compounds with various degrees of Pr/Ba randomness at the <I>A</I>-sites, the <I>A</I>-site disorder gradually suppresses both ferromagnetic and A-type antiferromagnetic transitions and finally leads to a magnetic glassy state in Pr<SUB>0.5</SUB>Ba<SUB>0.5</SUB>MnO<SUB>3</SUB>. A peculiar behavior, multi-step magnetization and resistivity change, has been observed in Pr<SUB>0.5</SUB>Ba<SUB>0.5</SUB>MnO<SUB>3</SUB>. These properties could be closely related to any spatial heterogeneity caused by the random distribution of Ba<SUP>2+</SUP> and <I>R</I><SUP>3+</SUP> with much different ionic radius.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 73(8), 2283-2291, 2004-08-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110001954967
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00319015
  • NDL Article ID
    7052263
  • 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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