Magnetic properties of monoclinic lanthanide orthoborates, LnBO<inf>3</inf>, Ln = Gd, Tb, Dy, Ho, Er, Yb
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Publication Date
2018-02Journal Title
Materials Research Bulletin
ISSN
0025-5408
Publisher
Elsevier BV
Volume
98
Pages
173-179
Type
Article
This Version
AM
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Mukherjee, P., Wu, Y., Lampronti, G., & Dutton, S. (2018). Magnetic properties of monoclinic lanthanide orthoborates, LnBO<inf>3</inf>, Ln = Gd, Tb, Dy, Ho, Er, Yb. Materials Research Bulletin, 98 173-179. https://doi.org/10.1016/j.materresbull.2017.10.007
Abstract
The lanthanide orthoborates, $Ln$BO$_3$, $Ln$ = Gd, Tb, Dy, Ho, Er, Yb
crystallise in a monoclinic structure with the magnetic $Ln^{3+}$ forming an
edge-sharing triangular lattice. The triangles are scalene, however all
deviations from the ideal equilateral geometry are less than 1.5%. The bulk
magnetic properties are studied using magnetic susceptibility, specific heat
and isothermal magnetisation measurements. Heat capacity measurements show
ordering features at $T \leq$ 2 K for $Ln$ = Gd, Tb, Dy, Er. No ordering is
observed for YbBO$_3$ at $T \geq$ 0.4 K and HoBO$_3$ is proposed to have a
non-magnetic singlet state. Isothermal magnetisation measurements indicate
isotropic Gd$^{3+}$ spins and strong single-ion anisotropy for the other
$Ln^{3+}$. The change in magnetic entropy has been evaluated to determine the
magnetocaloric effect in these materials. GdBO$_3$ and DyBO$_3$ are found to be
competitive magnetocaloric materials in the liquid helium temperature regime.
Relationships
Is supplemented by: https://www.repository.cam.ac.uk/handle/1810/267759
Sponsorship
Winton Programme for the Physics of Sustainability
Funder references
Engineering and Physical Sciences Research Council (EP/M000524/1)
Identifiers
External DOI: https://doi.org/10.1016/j.materresbull.2017.10.007
This record's URL: https://www.repository.cam.ac.uk/handle/1810/277581
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: http://creativecommons.org/licenses/by-nc-nd/4.0/
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