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Structure and magnetism of a new hexagonal polymorph of Ba$_3$Tb(BO$_3$)$_3$ with a quasi-2D triangular lattice | Nicola Kelly
; Cheng Liu
; Siân Dutton
; | Date: |
30 Jul 2020 | Abstract: | This article reports the structural and magnetic characterisation of a new
hexagonal ($P6_3cm$) low-temperature phase of Ba$_3$Tb(BO$_3$)$_3$,
isostructural with the heavier lanthanide borates with formula
Ba$_3$Ln(BO$_3$)$_3$ (Ln = Dy-Lu). The crystal structure contains a
quasi-two-dimensional (2D) triangular lattice of Tb$^{3+}$ ions and is
predicted to display unusual magnetic behaviour as a result of the low
dimensionality. Magnetic susceptibility $chi(T)$ shows antiferromagnetic
interactions ($ heta_{CW} = -7.15$ K) and no sharp ordering transition at $T
geq 2$ K, but analysis of $chi’(T)$, isothermal magnetisation and heat
capacity suggests the possibility of short-range ordering at $T approx 10$ K.
The material exhibits an inverse magnetocaloric effect at $T < 4$ K. | Source: | arXiv, 2007.15453 | Services: | Forum | Review | PDF | Favorites |
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