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Yosikazu Isikawa,Toshio Mizushima,Souta Miyamoto,Keigou Kumagai,Mako Nakahara,Hiroaki Okuyama,Takashi Tayama,Tomohiko Kuwai,Pascal Lejay 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The temperature dependences of the magnetization and the specific heat of the ferromagneticcompound DyFe2Zn20 have been measured in detail in various magnetic fields. We have observedanomalous magnetic behaviors, i.e., a strong anisotropy at 2 K, the disappearance of this anisotropyat temperatures between approximately 30 K and Tc, and an anomalous behavior of the specificheat in magnetic fields at temperatures near 20 K. These anomalous phenomena have been analyzedbased on the strong exchange interaction between the Fe itinerant electrons and the Dy localizedelectrons, as well as the crystalline electric field, the Zeeman energy, and an usual exchange interactionbetween two Dy atoms. The higher Tc of DyFe2Zn20 compared with that of DyRu2Zn20 iscaused by this exchange interaction between the Fe and the Dy atoms.