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arXiv · 1904.11513

Antiferromagnetic ordering and dipolar interactions of YbAlO$_3$

L. S. Wu·S. E. Nikitin·M. Brando·L. Vasylechko·G. Ehlers·M. Frontzek·A. T. Savici·G. Sala·A. D. Christianson·M. D. Lumsden·A. Podlesnyak
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Abstract

In this paper we report low-temperature magnetic properties of the rare-earth perovskite material YbAlO$_3$. Results of elastic and inelastic neutron scattering experiment, magnetization measurements along with the crystalline electrical field (CEF) calculations suggest that the ground state of Yb moments is a strongly anisotropic Kramers doublet, and the moments are confined in the $ab$-plane, pointing at an angle of $\varphi = \pm 23.5^{\circ}$ to the $a$-axis. With temperature decreasing below $T_{\rm N}=0.88$ K, Yb moments order into the coplanar, but non-collinear antiferromagnetic (AFM) structure $AxGy$, where the moments are pointed along their easy-axes. In addition, we highlight the importance of the dipole-dipole interaction, which selects the type of magnetic ordering and may be crucial for understanding magnetic properties of other rare-earth orthorhombic perovskites. Further analysis of the broad diffuse neutron scattering shows that one-dimensional interaction along the $c$-axis is dominant, and suggests YbAlO$_3$ as a new member of one dimensional quantum magnets.

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L. S. Wu, S. E. Nikitin, M. Brando, L. Vasylechko, G. Ehlers, M. Frontzek, A. T. Savici, G. Sala, A. D. Christianson, M. D. Lumsden, A. Podlesnyak. 2019-04-25. Antiferromagnetic ordering and dipolar interactions of YbAlO$_3$. https://doi.org/10.1103/physrevb.99.195117

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