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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>.