Structure and magnetism of a new hexagonal polymorph of Ba${}_3$Tb(BO${}_3$)${}_3$ with a quasi-2D triangular lattice

Abstract

This article reports the structural and magnetic characterisation of a new hexagonal ($P{6}_{3}cm$) 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 (${\theta }_{CW}=-7.15$ K) and no sharp ordering transition at $T\ge 2$ K, but analysis of ${\chi }^{\prime }(T)$, 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.

References in corpus (4)

• Continuous excitations of the triangular-lattice quantum spin liquid YbMgGaO4
• Crystalline Electric Field Randomness in the Triangular Lattice Spin-Liquid YbMgGaO${}_4$
• Magnetic properties of monoclinic lanthanide orthoborates, $Ln$BO${}_3$, $Ln$ = Gd, Tb, Dy, Ho, Er, Yb
• Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4

Cited by in corpus (3)

• Realization of Quantum Dipoles in Triangular Lattice Crystal Ba3Yb(BO3)3
• Low-temperature magnetic behaviour on the triangular lattice in hexagonal Ba${}_3$Tb(BO${}_3$)${}_3$
• Magnetic and magnetocaloric effect in the stuffed honeycomb antiferromagnet GdInO3 polycrystalline