Anisotropic magnetoresistivity and magnetic entropy change in HoAl2

We report a correlation between magnetoresistivity Δρmag and magnetic entropy change ΔSmag for specified crystallographic directions of a HoAl2 single crystal. This ferromagnetic compound shows differentiated behavior among the members of the RAl2 series due to the presence of spontaneous spin reori...

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Bibliographic Details
Published inIntermetallics Vol. 75; pp. 51 - 53
Main Authors de Souza, M.V., Plaza, E.J.R., Campoy, J.C.P.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2016
Subjects
Anisotropy
Magnetocaloric effect
Magnetoresistivity
Spin reorientation
Spin reorientation
Magnetocaloric effect
Anisotropy
Magnetoresistivity
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Summary:We report a correlation between magnetoresistivity Δρmag and magnetic entropy change ΔSmag for specified crystallographic directions of a HoAl2 single crystal. This ferromagnetic compound shows differentiated behavior among the members of the RAl2 series due to the presence of spontaneous spin reorientation. We discussed this effect in order to establish a relationship between the two quantities studied. The calculations were performed using a self-consistent model based on a Hamiltonian containing exchange, Zeeman and crystal field terms. We found that the normalized relation {Δρmag} = (T/TC)m{ΔSmag}, with m=0.1 for the [100] and [110] directions matches satisfactorily the two quantities.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2016.05.005