Anikin M. S.1,2, Tarasov E. N.1,2, Zinin A. V.1,2, Kudrevatykh N. V.1,2, Neznakhin D. S.1,2, Semkin M. A.1,2,3, Knyazev M. I.1,2, Selezneva N. V.1,2, Andreev S. V.1,2
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Email: maksim.anikin@urfu.ru
To clarify the nature of the anomalously high magnetocaloric effect at low temperatures in the RMe2 Laves type phases with "non-magnetic" rare-earth ions (R=Y or Lu) and 3d elements of the Fe group (Me=Fe, Co), the Y(Co1-xFe_x)2 (x=0.12-0.20) and Lu(Co0.84Fe0.16)2 compositions have been synthesized and their magnetic and magnetocaloric properties were investigated (isothermal magnetic entropy change Δ Sm and adiabatic temperature change Δ Tad). It has been established that the iron concentration increases and/or Y by Lu replacement with unchanged Co : Fe ratio gives rise in the energy of the d-d exchange interaction, which is followed by an increase in the Curie temperature value as well as by the low-temperature anomaly shift on the Δ S_m(T) dependence to a higher temperatures range. Keywords: magnetocaloric effect, adiabatic temperature change, magnetic moments, Laves phase, Curie temperature, mictomagnetism.
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