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Condensed Matter > Materials Science
Title: Magnetism on the stretched diamond lattice in lanthanide orthotantalates
(Submitted on 3 Mar 2022 (v1), last revised 7 Apr 2022 (this version, v2))
Abstract: The magnetic Ln$^{3+}$ ions in the fergusonite and scheelite crystal structures form a distorted or stretched diamond lattice which is predicted to host exotic magnetic ground states. In this study, polycrystalline samples of the fergusonite orthotantalates $M$-LnTaO$_4$ (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er) are synthesized and then characterized using powder diffraction and bulk magnetometry and heat capacity. TbTaO$_4$ orders antiferromagnetically at 2.25 K into a commensurate magnetic cell with $\vec{k}=0$, magnetic space group 14.77 ($P2_1$$'/c$) and Tb moments parallel to the $a$-axis. No magnetic order was observed in the other materials studied, leaving open the possibility of exotic magnetic states at $T<2$ K.
Submission history
From: Nicola Kelly [view email][v1] Thu, 3 Mar 2022 11:25:13 GMT (6523kb,D)
[v2] Thu, 7 Apr 2022 07:49:12 GMT (6523kb,D)
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