Magnetic Phase Diagrams of Y-Diluted Antiferromagnet Tb_<1-x>Y_xB_2C_2 (0.2 ≦ x ≦ 0.5)

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Abstract

Magnetic <I>B</I>–<I>T</I> phase diagrams were examined by magnetization and specific heat experiments on the single crystalline Tb<SUB>1−<I>x</I></SUB>Y<I><SUB>x</SUB></I>B<SUB>2</SUB>C<SUB>2</SUB> (0.2≤<I>x</I>≤0.5) compounds, and neutron diffraction experiments was performed on the powder Tb<SUB>0.5</SUB>Y<SUB>0.5</SUB><SUP>11</SUP>B<SUB>2</SUB>C<SUB>2</SUB> sample. The magnetization curves evidence that the field-induced transition occurs from phase IV into phase II′ through a mixed phase of both phases, where phase IV is antiferromagnetic and phase II′ is a field-induced phase with the antiferromagnetic and antiferroquadrupolar order. The mixed phase (IV+II′) is enhanced by the Y-dilution, and the lower and upper verges of the mixed phase become clearer in the differential magnetization <I>dM</I>⁄<I>dB</I>–<I>B</I> curves. The Y-dilution results in scaling down of the ordered phases regions in the <I>B</I>–<I>T</I> space. The ways of scale down of the ordered phase are different between two field directions along the tetragonal [100] and [110]-axes, that is, the anisotropy of phase stability is increased by the Y dilution. It is supposed that the enhancement of anisotropic phase stability by the Y dilution may be due to the symmetry of the multipoles and the anisotropic multipolar interactions weakened by the Y dilution.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 75(7), "74704-1"-"74704-9", 2006-07-15

    The Physical Society of Japan (JPS)

References:  32

Codes

  • NII Article ID (NAID)
    110004777979
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00319015
  • NDL Article ID
    7973882
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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