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Non-Fermi liquid behavior in nonlinear susceptibility in Pr$$_{0.05}$$La$$_{0.95}$$Pb$$_3$$

Kawae, Tatsuya*; Koga, Mikito*; Sato, Yoshiaki*; Makiyama, Shun*; Inagaki, Yuji*; Tateiwa, Naoyuki  ; Fujiwara, Tetsuya*; Suzuki, Hiroyuki*; Kitai, Tetsuo*

We measure the temperature dependence of the nonlinear susceptibility $${chi}_3$$ in Pr$$_{0.05}$$La$$_{0.95}$$Pb$$_3$$. $${chi}_3$$ reflects the fluctuation of the quadrupolar moments. Non-Fermi liquid behavior of $${chi}_3$$ with $$lnT$$-dependence is detected below 2.5 K, suggesting that the screening of the quadrupolar moments is responsible for the anomalous behavior at low temperatures. These results provide a direct evidence for the crucial role of the quadrupolar moments in Pr$$_{0.05}$$La$$_{0.95}$$Pb$$_3$$.

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