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Quadrupolar Kondo Effect in Non-Kramers Doublet System PrInAg2

Osamu Suzuki·Hiroyuki S. Suzuki·Hideaki Kitazawa·Giyuu Kido·Takafumi Ueno·Takashi Yamaguchi·Yuichi Nemoto·Terutaka Goto
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Abstract

We performed ultrasonic measurement on the rare-earth intermetallic compound PrInAg_2 to examine the quadrupolar Kondo effect associated with the non-Kramers Gamma_3 doublet ground state. The characteristic softening of the elastic constant (c_{11}-c_{12})/2 below 10 K in PrInAg_2 is attributed to a Curie term in quadrupolar susceptibility for the quadrupole O_2^2=J_x^2-J_y^2 of the stable Gamma_3 ground state. (c_{11}-c_{12})/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 T_K of ~ 0.86 K, the behavior of (c_{11}-c_{12})/2 is described in terms of quadrupolar susceptibility for the stable 4f^2 state.

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Osamu Suzuki, Hiroyuki S. Suzuki, Hideaki Kitazawa, Giyuu Kido, Takafumi Ueno, Takashi Yamaguchi, Yuichi Nemoto, Terutaka Goto. 2006-01-19. Quadrupolar Kondo Effect in Non-Kramers Doublet System PrInAg2. https://doi.org/10.1143/jpsj.75.013704

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