Enhanced cryogenic magnetocaloric performance and the existence of short-range magnetic correlations in frustrated diamond geometries

The magnetocaloric effect in the cryogenic temperature regime has gained enormous attention due to its application in the field of cryogenic refrigeration technology, which is required for quantum computing, space sciences and basic research activities. In this context, Gd- and Dy-based frustrated s...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2024-07, Vol.57 (29), p.295304
Main Authors: Kumar, Jogendra, Mukherjee, K
Format: Article
Language:English
Subjects:
geometrical frustration
magnetic refrigeration
short-range magnetic correlations
stretched diamond lattice
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Summary:The magnetocaloric effect in the cryogenic temperature regime has gained enormous attention due to its application in the field of cryogenic refrigeration technology, which is required for quantum computing, space sciences and basic research activities. In this context, Gd- and Dy-based frustrated systems are considered as promising cryogenic magnetocaloric materials. Hence, in this paper the magnetic and magnetocaloric properties of GdTaO 4 , GdNbO 4 and DyNbO 4 are comprehensively investigated. Structural analysis suggests that these compounds crystallize in a monoclinic structure, wherein magnetic ions form an elongated diamond geometry. Analysis of magnetization, heat capacity and field-dependent magnetic entropy changes confirms the presence of short-range magnetic correlations in these compounds. Additionally, a remarkably large magnetic entropy change and relative cooling power are noted. The mechanical efficiency is found to be comparable to (or even better than) those reported for good magnetic refrigerants. Our study suggests that GdTaO 4 , GdNbO 4 and DyNbO 4 can be regarded as promising cryogenic magnetic refrigerant materials.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/ad3bc2