Magnetothermal properties of Ho1_xDyxAl2 (x=0, 0.05, 0.10, 0.15, 0.25 and 0.50) compounds

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Ribeiro, P.O.
Alho, B.P.
De Oliveira, R.S.
Nóbrega, E.P.
de Sousa, V.S.R.
von Ranke, P.J.
Biswas, Anis
Khan, Mahmud
Mudryk, Y.
Pecharsky, V.K.
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Iowa State University Digital Repository, Ames IA (United States)
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

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Magnetic and magnetocaloric properties of Ho1_xDyxAl2 compounds with x = 0, 0.05, 0.10, 0.15, 0.25 and 0.50, modelled using a Hamiltonian that includes the exchange interactions between Ho-Dy, Ho-Ho and Dy-Dy ions in addition to the crystalline electric field and the Zeeman effects, have been compared with those determined experimentally. In order to reproduce experimentally observed global ferromagnetic ordering temperatures and spin reorientation transition temperatures as xDy varies, the exchange interactions between Ho-Dy and Ho-Ho were set as free parameters and adjusted to match the experimental results. We demonstrate that heat capacity of polycrystalline materials in non-zero magnetic fields can be satisfactory reproduced by using the average of multiple magnetic field directions with respect to the crystallographic coordinate system, while reasonably good agreement between experimentally determined and theoretically predicted magnetocaloric effects can be achieved considering an average of only three field directions.
This is a manuscript of an article published as Ribeiro, P. O., B. P. Alho, R. S. De Oliveira, E. P. Nóbrega, V. S. R. de Sousa, P. J. von Ranke, Anis Biswas, Mahmud Khan, Y. Mudryk, and V. K. Pecharsky. "Magnetothermal properties of Ho1-xDyxAl2 (x= 0, 0.05, 0.10, 0.15, 0.25 and 0.50) compounds." Journal of Magnetism and Magnetic Materials 544 (2022): 168705. DOI: 10.1016/j.jmmm.2021.168705. Copyright 2021 Elsevier B.V. Posted with permission. DOE Contract Number(s): AC02-07CH11358