Sensitivity of magnetic properties to chemical pressure in lanthanide garnets $L{n}_3{A}_2{X}_3{\text{O}}_{12}$, $Ln$ = Gd, Tb, Dy, Ho, $A$ = Ga, Sc, In, Te, $X$ = Ga, Al, Li

Abstract

A systematic study of the structural and magnetic properties of three-dimensionally frustrated lanthanide garnets $L{n}_3{A}_2{X}_3{\text{O}}_{12}$, $Ln$ = Gd, Tb, Dy, Ho, $A$ = Ga, Sc, In, Te, $X$ = Ga, Al, Li is presented. Garnets with $Ln$ = Gd show magnetic behaviour consistent with isotropic Gd${}^{3+}$ spins; no magnetic ordering is observed for T $\ge$ 0.4 K. Magnetic ordering features are seen for garnets with $Ln$ = Tb, Dy, Ho in the temperature range 0.4 < T < 2.5 K, however the nature of the magnetic ordering varies for the different $Ln$ as well as for different combinations of $A$ and $X$. The changes in magnetic behaviour can be explained by tuning of the magnetic interactions and changes in the single-ion anisotropy. The change in magnetic entropy is evaluated from isothermal magnetisation measurements to characterise the magnetocaloric effect in these materials. Among the Gd garnets, the maximum change in magnetic entropy per mole (15.45 J K${}^{-1}$ mol${}_{\text{Gd}}^{-1}$) is observed for Gd${}_3$Sc${}_2$Ga${}_3$O${}_{12}$ at 2 K, in a field of 9 T. The performance of Dy${}_3$Ga${}_5$O${}_{12}$ as a magnetocaloric material surpasses the other garnets with $Ln$ = Tb, Dy, Ho.

22 pages, 7 figures, 1 supplementary figure, accepted for publication in Journal of Physics: Condensed Matter

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• Magnetic Frustration in Lead Pyrochlores
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• Geometric frustration on the trillium lattice in a magnetic metal-organic framework
• Magnetic order and single-ion anisotropy in Tb${}_3$Ga${}_5$O${}_{12}$
• Magnetism on the stretched diamond lattice in lanthanide orthotantalates
• Spin dynamics of the director state in frustrated hyperkagome systems
• Relieving the frustration through Mn${}^{3+}$ substitution in Holmium Gallium Garnet
• Low-temperature magnetic behaviour on the triangular lattice in hexagonal Ba${}_3$Tb(BO${}_3$)${}_3$
• Magnetic Properties of the Quasi-1D Magnesium Lanthanide Borates Mg$Ln$B${}_5$O${}_{10}$
• Bulk magnetic properties of distorted square lattice compounds M'-LnTaO4 (Ln = Tb, Dy, Ho, Er)