镧系钽酸盐中拉伸金刚石晶格的磁性
Magnetism on the stretched diamond lattice in lanthanide orthotantalates
摘要：
磁Ln $^{3+}$离子在铁磁锰矿和白钨矿晶体结构形成一个扭曲或拉伸的金刚石晶格，预计主机外来磁基态。本研究合成了铌钽酸盐$M$ -LnTaO $_4$（Ln = Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er）多晶样品，并利用粉末衍射、体磁测量和热容对其进行了表征。TbTaO $_4$在2.25 K下反铁磁性地排列成具有$\vec{k}=0$、磁性空间群14.77（$P2_1$ $'/c$）和平行于$a$ -轴的Tb矩的相称磁性单元。在所研究的其他材料中没有观察到磁序，从而留下了在$T<2$ K下奇异磁态的可能性。
英文摘要：
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.
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