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The temperature dependence of magnetization and specific heat of theferromagnetic compound DyFe2Zn20 has been measured in detail in variousmagnetic fields. We have observed anomalous magnetic behavior, i.e., a stronganisotropy at 2 K, disappearance of this anisotropy between approximately 30 Kand T_c, and anomalous behavior of the specific heat in the magnetic fieldsnear 20 K. These anomalous phenomena have been analyzed based on the strongexchange interaction between the Fe itinerant electrons and the Dy localizedelectrons as well as the crystalline electric field, Zeeman energy, and anusual exchange interaction between two Dy atoms. The higher T_c of DyFe2Zn20compared with that of DyRu2Zn20 is caused by this exchange interaction betweenthe Fe and Dy atoms.

Enhancement of Curie temperature due to the coupling between Fe itinerant electrons and Dy localized electrons in DyFe2Zn20