Magnetic properties of monoclinic lanthanide orthoborates, LnBO<inf>3</inf>, Ln = Gd, Tb, Dy, Ho, Er, Yb

Authors
Mukherjee, Paromita  ORCID logo  https://orcid.org/0000-0001-5121-6280
Lampronti, GI 
Dutton, SE 

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Article
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Abstract

The lanthanide orthoborates, LnBO3, Ln = Gd, Tb, Dy, Ho, Er, Yb crystallise in a monoclinic structure with the magnetic Ln3+ 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≤ 2 K for Ln = Gd, Tb, Dy, Er. No ordering is observed for YbBO3 at T≥ 0.4 K and HoBO3 is proposed to have a non-magnetic singlet state. Isothermal magnetisation measurements indicate isotropic Gd3+ spins and strong single-ion anisotropy for the other Ln3+. The change in magnetic entropy has been evaluated to determine the magnetocaloric effect in these materials. GdBO3 and DyBO3 are found to be competitive magnetocaloric materials in the liquid helium temperature regime.

Publication Date
2018
Online Publication Date
Acceptance Date
2017-10-04
Keywords
Inorganic compounds, Magnetic properties, X-Ray diffraction, Crystal structure, Specific heat
Journal Title
Materials Research Bulletin
Journal ISSN
0025-5408
1873-4227
Volume Title
98
Publisher
Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/M000524/1)
Winton Programme for the Physics of Sustainability
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