Magnetic and magnetocaloric properties of R sub(6Mn) sub(2)3 (R=Y, Nd, Sm, Gd-Tm, Lu) compounds

The magnetic and magnetocaloric properties of the R sub(6Mn) sub(2)3 compounds (R=Y, Nd, Sm, Gd-Tm, Lu) are investigated from DC magnetization measurements. The results are analyzed and discussed in connection with previously published data. These binaries crystallize in the cubic Th sub(6Mn) sub(2)...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2011-11, Vol.323 (21), p.2690-2695
Main Authors: Lemoine, P, Verniere, A, Mazet, T, Malaman, B
Format: Article
Language:English
Subjects:
Cooling
Ground state
Magnetic properties
Magnetization
Neodymium
Order disorder
Rare earth compounds
Rare earth metals
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Summary:The magnetic and magnetocaloric properties of the R sub(6Mn) sub(2)3 compounds (R=Y, Nd, Sm, Gd-Tm, Lu) are investigated from DC magnetization measurements. The results are analyzed and discussed in connection with previously published data. These binaries crystallize in the cubic Th sub(6Mn) sub(2)3 type of structure (Fm-3m). The Mn sublattice orders at high temperature (398 K=T sub(C=505 K) with a collinear ferrimagnetic structure. The R sublattice orders at lower temperature (100 K) with a non-collinear arrangement. By opposition with the usual behaviour in intermetallics, light rare-earth compounds (R=Nd and Sm) have a lower ground state magnetization than the heavy rare-earth compounds (R=Gd-Tm). This manifests in their magnetocaloric response near the R ordering temperature: the compounds with R=Gd-Tm display a normal magnetocaloric effect of moderate magnitude (50 mJ cm) super(-)3 K super(-1 for a field variation of 5 T) while those with R=Nd and Sm present an inverse magnetocaloric effect of weaker magnitude. The potential interest of these phases for cooling applications is briefly discussed.)
ISSN:0304-8853
DOI:10.1016/j.jmmm.2011.06.012