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MBE, LPE와 $\mu$ - PD 기술에 의한 산화물재료의 개선된 단결정 성장방법
윤대호,Masahito Yoshizawa 한국결정성장학회 1995 韓國結晶成長學會誌 Vol.5 No.4
The growth processes of improved methods for MBE, LPE and $\mu$ - PD methods are discussed taking the oxide materials, especially those of Bi - Sr - Ca - Cu family $LiNbO_3$ and $K_3Li_2Nb_5O_{15}$ family as examples. It is suggested that the crystal growth far from equilibr iu m including composition homogeneity has been achieved to satisfy in understanding and controlling the atomic interfaces. 분자션 에피텍시얼(MBE)법, 액상 에피텍시열(LPE)법과 마이크로 인상($\mu$ - PD)법 에 의한 단결정 성장에 있어서의 새로운 접근을 논의하였다. 재료로써는 Bi-Sr-Ca-Cu계, $K_3Li_2Nb_5O_{15}$계의 산화물을 사용하였으며, 비평형영역으로 부터의 고품질(균일 조성 및 저결함 밀도) 결정성장은 원자수준의 계면제어에 의해 가능함을 고찰할 수 있였다.
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>.
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.