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Journal Articles

Precise magnetization measurements down to 500 mK using a miniature $$^3$$He cryostat and a closed-cycle $$^3$$He gas handling system installed in a SQUID magnetometer without continuous-cooling functionality

Shimamura, Kazutoshi*; Wajima, Hiroki*; Makino, Hayato*; Abe, Satoshi*; Haga, Yoshinori; Sato, Yoshiaki*; Kawae, Tatsuya*; Yoshida, Yasuo*

Japanese Journal of Applied Physics, 61(5), p.056502_1 - 056502_7, 2022/05

https://doi.org/10.35848/1347-4065/ac5bb0
 Times Cited Count：0 Percentile：0(Physics, Applied)

Journal Articles

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*

JPS Conference Proceedings (Internet), 3, p.012030_1 - 012030_6, 2014/06

https://doi.org/10.7566/JPSCP.3.012030

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$$_3$$.

Journal Articles

Nonlinear susceptibility measurement for quadrupolar response in a dilute $${Gamma}_3$$ non-Kramers doublet system 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*

Journal of the Physical Society of Japan, 82(7), p.073701_1 - 073701_4, 2013/07

https://doi.org/10.7566/JPSJ.82.073701
 Times Cited Count：10 Percentile：56.47(Physics, Multidisciplinary)

We measure the temperature dependence of the nonlinear susceptibility $${chi}_3$$, which reflects the fluctuation of quadrupolar moments in, Pr$$_{0.05}$$La$$_{0.95}$$Pb$$_{3}$$ which a $${Gamma}_3$$ non-Kramers doublet in the crystal-electric-field ground state to provide evidence of the quadrupolar Kondo effect. Non-Fermi liquid behavior of $${chi}_3$$ with a - ln $$T$$ dependence is detected in the [100] and [110] directions below $$T$$ $${approx}$$ 2.5 K, suggesting the screening of quadrupolar moments. In contrast, $${chi}_3$$ in the [111] direction becomes constant below $$T$$ $${approx}$$ 3 K. The observed features indicate that a low-lying $${Gamma}_3$$ doublet plays a crucial role in the anomalous properties of Pr$$_x$$La$$_{1-x}$$Pb$$_3$$.

Journal Articles

Pressure-induced valence change in the rare earth metals; The Case of praseodymium

Tateiwa, Naoyuki; Nakagawa, Akitoshi*; Fujio, Kazuhiko*; Kawae, Tatsuya*; Takeda, Kazuyoshi*

Journal of Alloys and Compounds, 408-412, p.244 - 247, 2006/02

https://doi.org/10.1016/j.jallcom.2005.04.032
 Times Cited Count：2 Percentile：22.09(Chemistry, Physical)

The rare earth metal praseodymium (Pr) transforms from the d-fcc crystal structure (Pr-III) to $$alpha$$-U one (Pr-IV) at 20 GPa with a large volume collapse ($${Delta}V/V$$ = 0.16), which is associated with the valence change of the Pr ion. The two 4f electrons in the Pr ion is supposed to be itinerant in the Pr-IV phase. In order to investigate the electronic state of the phase IV, we performed the high-pressure electrical resistance measurement using the diamond anvil cell up to 32 GPa. In the Pr-IV phase, the temperature dependence of the resistance shows an upward negative curvature, suggestting the narrow quasiparticle band of the 4f electrons near the Fermi energy. A new phase boundary is found at $$T_0$$ in the Pr-IV phase. From the temperature and magnetic field dependences of the resistance at 26 GPa, the ground state of the Pr-IV phase is suggested to be magnetic. Several possibilities for the origin of $$T_0$$ are discussed.

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