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Ultrasound Measurements on the Skutterudite Compound SmOs4P12
Yoshiki Nakanishi,Gen Koseki,Dai Tamura,Kohei Kurita,Takeshi Saito,Minoru Koseki,Mitsuteru Nakamura,Masahito Yoshizawa,Yuya Koyota,Chihiro Sekine,Takehiko Yagi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have investigated the elastic properties of the Sm-based filled skutterudite compoundSmOs4P12 for the first time. The measurements were performed on polycrystalline samples preparedat high temperatures and high pressures by using a wedge-type, cubic anvil, high-pressureapparatus. A clear and steep decrease was observed at an antiferromagnetic transition temperatureof 4.5 K in the temperature dependence of both the longitudinal and the transverse elastic constants. Absence of a precursor behavior reminds us of the multipolar ordering, possibly octupolarordering, observed in the isostructural system SmRu4P12. The transition is robust against an externalmagnetic field. We argue that the low-lying degenerate levels derived from the 4f-multipletground state of the Sm ion is split by the crystalline electric field in SmOs4P12. Furthermore, wediscuss the phononic properties, which include the ionic degrees of freedom for the rattling motion,and compare them with the values for other isostructural systems.
Ultrasonic Investigation of the Eu-based Intermetallic System EuZn₂Ge₂
Shinya Kudo,Kazuki Saito,Takuto Sato,Mitsuteru Nakamura,Masahito Yoshizawa,Kazuhei Wakiya,Yoshiki Nakanishi,Hikaru Hirabayashi,Shinji Michimura,Masashi Kosaka 한국물리학회 2023 새물리 Vol.73 No.12
In this study, an elastic property of EuZn₂Ge₂ with the tetragonal ThCr₂Si₂-type structure has been investigated by ultrasonic measurements. Elastic constants C<SUB>33</SUB> and C<SUB>44</SUB> were measured as a function of temperature and magnetic _eld applied along the [001] direction. A previous study reported that EuZn₂Ge₂ exhibited three magnetic phase transitions at T<SUB>N1</SUB> = 14.9 K, T<SUB>N2</SUB> = 8.4 K, and T<SUB>t</SUB> = 5 K. We found that an elastic anomaly appeared in the temperature dependence of both of C<SUB>33</SUB> and C<SUB>44</SUB> at T<SUB>N2</SUB>. On the other hand, the corresponding anomaly was hardly visible at T<SUB>N1</SUB> and T<SUB>t</SUB>. These results suggest that a magneto-elastic coupling at T<SUB>N2</SUB> may be relatively large compared with those at T<SUB>N1</SUB> and T<SUB>t</SUB>.