Pressure-Induced Release of Magnetic Frustration in a Quasi-Kagome Antiferromagnet YbAgGe

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Author(s)

Abstract

We report on specific-heat measurements under various pressures up to 3.2GPa for a heavy-fermion antiferromagnet YbAgGe with a quasi-kagome lattice of Yb ions. For 0.5<P<P^*=1.6GPa, the magnetic transition temperature T_M remains constant at 0.85K, while above P^* the T_M increases linearly with a slope of 0.52K/GPa. Concomitantly, the specific-heat anomaly at T_M converts from a first-order type sharp peak to a second-order type jump. The magnetic entropy at T_M rises for P>P^*, whereas the Kondo temperature T_K does not change, contrary to the behavior expected from the Doniach phase diagram. These findings suggest that the sudden rise of T_M(P) for P>P^* is not due to the lowering of T_K but the release of the magnetic frustration.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 77(2), "23704-1"-"23704-3", 2008-02-15

    The Physical Society of Japan (JPS)

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  • Successive Magnetic Transitions in a Frustrated Compound YbAgGe

    UMEO Kazunori , YAMANE Kyoutarou , MURO Yuji , KATOH Kenichi , NIIDE Yuzuru , OCHIAI Akira , MORIE Takaaki , SAKAKIBARA Toshiro , TAKABATAKE Toshiro

    Journal of the Physical Society of Japan 73(3), 537-540, 2004-03-15

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Codes

  • NII Article ID (NAID)
    110006613872
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    00319015
  • NDL Article ID
    9377094
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS 
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