Large reversible magnetocaloric effect in the ferromagnetic pyrochlores R 2 Mn 2 O 7 ( R = Dy, Ho, Yb)
Journal of Magnetism and Magnetic Materials, ISSN: 0304-8853, Vol: 490, Page: 165494
2019
- 8Citations
- 17Captures
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Article Description
We report the large reversible magnetocaloric effect (MCE) in the cubic pyrochlores R 2 Mn 2 O 7 ( R = Dy, Ho, Yb) near their second-order ferromagnetic (FM) transition at T C ≈ 39 K due to a simultaneous FM ordering of rear-earth R 3+ and transition-metal Mn 4+ localized moments. Under the magnetic field change of 1 T (7 T), the maximum magnetic entropy change −Δ S M max is 5.7 (20.1), 4.3 (18.4), 3.9 (13.9) J·kg −1 ·K −1, and the estimated magnetic refrigerant capacity RC reaches 20.0 (564), 18.4 (503.7), 13.1 (371.4) J·kg −1 for Dy 2 Mn 2 O 7, Ho 2 Mn 2 O 7, and Yb 2 Mn 2 O 7, respectively. We have discussed their magnetic properties and its correlation with MCE in terms of the intrinsic single-ion anisotropy of R 3+ ions. Our results demonstrate that R 2 Mn 2 O 7 cubic pyrochlores constitute a promising material platform for magnetic refrigeration applications in the intermediate temperature range.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0304885319314258; http://dx.doi.org/10.1016/j.jmmm.2019.165494; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85068112108&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0304885319314258; https://dx.doi.org/10.1016/j.jmmm.2019.165494
Elsevier BV
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