Magnetocaloric effect in RAl$_{2}$ (R=Nd, Sm, and Tm): Promising for cryogenic refrigeration close to liquid helium temperature
Magnetocaloric effect in RAl$_{2}$ (R=Nd, Sm, and Tm): Promising for cryogenic refrigeration close to liquid helium temperature
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...
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Personal Name(s): | Patra, M. |
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Majumdar, S. / Giri, S. (Corresponding Author) / Xiao, Y. / Chatterji, T. | |
Contributing Institute: |
Streumethoden; JCNS-2 JARA-FIT; JARA-FIT Streumethoden; PGI-4 |
Published in: | Journal of alloys and compounds, 531 (2012) S. 55 - 58 |
Imprint: |
Lausanne
Elsevier
2012
|
DOI: |
10.1016/j.jallcom.2012.03.076 |
Document Type: |
Journal Article |
Research Program: |
JCNS In-house Research with PNI Neutrons Exploratory materials and phenomena Spin-based and quantum information |
Publikationsportal JuSER |
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. |