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High-pressure Studies of DyB2C2
Hiroki Yamauchi,Toyotaka Osakabe,Masashi Kosaka,Eiichi Matsuoka,Hideya Onodera 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We performed single-crystal neutron diffraction experiments and electrical resistivity measurementsunder high pressure on DyB2C2 showing both the antiferroquadrupolar (AFQ) and antiferromagnetic(AFM) orders. The N´eel temperature TN increases gradually with increasing pressure andsaturates at pressures above 5.2 GPa while the AFQ transition temperature TQ decreases almostmonotonically up to 3.13 GPa and seems to merge with TN at around 6 – 7 GPa. These resultsindicate that the application of pressure suppresses the AFQ ordering in DyB2C2 and simultaneouslyenhances the AFM interaction between 4f spins. The suppression of the AFQ ordering canbe interpreted as being due to the restriction of the local strain associated with the AFQ transitioncaused by applying pressure.
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>.