Quadrupolar Kondo Effect in Non-Kramers Doublet System PrInAg<sub>2</sub>

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  • Quadrupolar Kondo Effect in Non-Kramers Doublet System PrInAg2

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We performed ultrasonic measurement on the rare-earth intermetallic compound PrInAg2 to examine the quadrupolar Kondo effect associated with the non-Kramers Γ3 doublet ground state. The characteristic softening of the elastic constant (c11−c12)⁄2 below 10 K in PrInAg2 is attributed to the Curie term in quadrupolar susceptibility for the quadrupole O22=Jx2−Jy2 of the stable Γ3 ground state. (c11−c12)⁄2 turns to a slight increase with the −lnT dependence below 0.1 K, which suggests the quenching of the quadrupolar moment in the quadrupolar Kondo state. Under applied magnetic fields of 10 T and 15 T above 8.7 T corresponding to the Kondo temperature TK of ∼0.86 K, the behavior of (c11−c12)⁄2 is described in terms of quadrupolar susceptibility for the stable 4f2 state.

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