%0 Journal Article
%A Patra, M.
%A Majumdar, S.
%A Giri, S.
%A Xiao, Y.
%A Chatterji, T.
%T Magnetocaloric effect in RAl$_{2}$ (R=Nd, Sm, and Tm): Promising for cryogenic refrigeration close to liquid helium temperature
%J Journal of alloys and compounds
%V 531
%@ 0925-8388
%C Lausanne
%I Elsevier
%M FZJ-2015-03811
%P 55 - 58
%D 2012
%X NdAl2 and TmAl2 single-crystals display Curie temperature (TC) at 76.5 and 6.0 K, which are significantly close to liquid nitrogen and helium (THe) temperatures, respectively. Maximum entropy-change (−ΔSM) for 0–70 kOe are 35.9 and 8.9 J/kg-K at TC with large cooling efficiency 655 and 398 J/kg for TmAl2 and NdAl2, respectively. Adiabatic temperature change at THe for 0–20 kOe is 3.7 K for TmAl2. This is promising for cryogenic refrigeration down to sub-Kelvin temperature using an electromagnet. The −ΔSM for SmAl2 is low (∼0.5 J/kg-K at TC for 0–70 kOe). The direction-dependent anisotropy in thermal and field variations of ΔSM, and a reasonable correlation between ΔSM and magnetoresistance are realized for NdAl2 and TmAl2.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000304061100012
%R 10.1016/j.jallcom.2012.03.076
%U https://juser.fz-juelich.de/record/201517