TY  - JOUR
AU  - Patra, M.
AU  - Majumdar, S.
AU  - Giri, S.
AU  - Xiao, Y.
AU  - Chatterji, T.
TI  - Magnetocaloric effect in RAl$_{2}$ (R=Nd, Sm, and Tm): Promising for cryogenic refrigeration close to liquid helium temperature
JO  - Journal of alloys and compounds
VL  - 531
SN  - 0925-8388
CY  - Lausanne
PB  - Elsevier
M1  - FZJ-2015-03811
SP  - 55 - 58
PY  - 2012
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000304061100012
DO  - DOI:10.1016/j.jallcom.2012.03.076
UR  - https://juser.fz-juelich.de/record/201517
ER  -