Quadrupole ordering in clathrate compound Ce3Pd20Si6

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  • Quadrupole Ordering in Clathrate Compound Ce<SUB>3</SUB>Pd<SUB>20</SUB>Si<SUB>6</SUB>

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Low-temperature elastic properties of the clathrate compound Ce3Pd20Si6 were investigated using ultrasonic measurements. Pronounced softening of elastic constants (C11C12)⁄2 and C44 with decreasing temperature indicates a precursor of electric quadrupole ordering due to a Γ8 quartet ground sate with an orbital degeneracy for 8c site of a Ce ion. A minimum of (C11C12)⁄2 at TC=170 mK 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 Oxy-type order parameter in CeB6 with the Γ8 ground sate. The order paramater of the phase III may be characterized by either magnetic dipole or magnetic octupole. The Γ7 ground state at 4a site may fall into a singlet screened by conduction electrons at low temperatures without long-range magnetic ordering.

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