Novel Phase Transition and the Pressure Effect in YbFe<SUB>2</SUB>Al<SUB>10</SUB>-type Ce<I>T</I><SUB>2</SUB>Al<SUB>10</SUB> (<I>T</I>=Fe, Ru, Os)

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Abstract

We have succeeded in growing single crystals of orthorhombic Ce<I>T</I><SUB>2</SUB>Al<SUB>10</SUB> (<I>T</I>=Fe, Ru, and Os) by the Al self-flux method for the first time, and measured their electrical resistivity ρ at pressures of up to 8 GPa, magnetic susceptibility χ, and specific heat <I>C</I> at ambient pressure. The results indicate that Ce<I>T</I><SUB>2</SUB>Al<SUB>10</SUB> belongs to the heavy fermion compounds. CeRu<SUB>2</SUB>Al<SUB>10</SUB> and CeOs<SUB>2</SUB>Al<SUB>10</SUB> show similar phase transitions at <I>T</I><SUB>0</SUB>=27.3 and 28.7 K, respectively. The temperature dependences of ρ, χ, and <I>C</I> in the ordered phases are well described by the thermally activated form, suggesting that a partial gap opens over the Fermi surfaces below <I>T</I><SUB>0</SUB>. When pressure is applied to CeRu<SUB>2</SUB>Al<SUB>10</SUB>, <I>T</I><SUB>0</SUB> disappears suddenly between 3 and 4 GPa, and CeRu<SUB>2</SUB>Al<SUB>10</SUB> turns into a Kondo semiconductor, and then into a metal. The similarity of Ce<I>T</I><SUB>2</SUB>Al<SUB>10</SUB> compounds under respective pressures suggests a scaling relation by some parameter controlling the unusual physics of these compounds.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 78(12), 123705-123705, 2009

    THE PHYSICAL SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130005437205
  • Text Lang
    ENG
  • ISSN
    0031-9015
  • Data Source
    J-STAGE 
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