Quadrupole Ordering in Clathrate Compound Ce_3Pd_<20>Si_6

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Author(s)

Abstract

Low-temperature elastic properties of the clathrate compound Ce_3Pd_<20>Si_6 were investigated using ultrasonic measurements. Pronounced softening of elastic constants (C_<11>-C_<12>)/2 and C_<44> with decreasing temperature indicates a precursor of electric quadrupole ordering due to a Γ_8 quartet ground sate with an orbital degeneracy for 8c site of a Ce ion. A minimum of (C_<11>-C_<12>)/2 at T_C=170mK indicates a transition from paramagnetic phase I to an ordered phase III. Applied magnetic fields induce an antiferro-quadrupole (AFQ) ordered phase II with highly anisotropic character depending on the field direction, which resembles the AFQ phase with O_<xy>-type order parameter in CeB_6 with the Γ_8 ground sate. The order paramater of the phase III may be characterized by either magnetic dipole or magnetic octupole. The Γ_7 ground state at 4a site may fall into a singlet screened by conduction electrons at low temperatures without long-range magnetic ordering.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 78(2), "24716-1"-"24716-9", 2009-02-15

    The Physical Society of Japan (JPS)

References:  29

Codes

  • NII Article ID (NAID)
    110007097862
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00319015
  • NDL Article ID
    9800634
  • 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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