Journal
APPLIED PHYSICS LETTERS
Volume 120, Issue 8, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0081688
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Funding
- National Natural Science Foundation of China [52002383]
- Ningbo Municipal Bureau of Science and Technology [202003N4365]
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This study investigates the magnetic properties and magnetocaloric performance of two high-entropy perovskites. It is found that a spin-glass phase occurs at low temperatures in the high-entropy compounds, leading to a sluggish magnetic transition. The increase in configurational entropy results in large refrigerant capacity for these materials.
The high-entropy concept has been recently proposed to be a promising paradigm to enhance the magnetocaloric properties of materials. Motivated by this, the magnetic properties and the magnetocaloric performance of two high-entropy perovskites (Dy1/4Ho1/4Er1/4Tb1/4)FeO3 and (Gd1/5Dy1/5Ho1/5Er1/5Tb1/5)FeO3 have been investigated. The magnetic measurements indicate that a spin-glass phase occurs at low temperatures in the high-entropy compounds, which is induced by the strong compositional disorder of rare-earth sublattice. The glassy state can lead to a sluggish magnetic transition and consequently a potential improvement in the magnetocaloric performance. Due to the increase in configurational entropy, large refrigerant capacity of 247 and 203 J/kg for a magnetic field change of 70 kOe is obtained in the (Gd1/5Dy1/5Ho1/5Er1/5Tb1/5)FeO3 and (Dy1/4Ho1/4Er1/4Tb1/4)FeO3 compounds, respectively. Our findings highlight the availability of spin order control through tuning the configurational entropy and demonstrate the key role of high-entropy design in enhancing the magnetocaloric properties of materials.
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