# Antiferromagnetic ordering and dipolar interactions of YbAlO$_3$

## TL;DR

This study investigates the magnetic properties of YbAlO$_3$, revealing antiferromagnetic order, anisotropic Yb moments confined in the plane, and the significance of dipolar interactions, positioning YbAlO$_3$ as a potential one-dimensional quantum magnet.

## Contribution

It provides detailed experimental and theoretical insights into the magnetic structure and interactions of YbAlO$_3$, highlighting the role of dipole-dipole interactions and one-dimensional magnetic behavior.

## Key findings

- Yb moments form a non-collinear AFM structure below 0.88 K.
- Dipole-dipole interactions influence magnetic ordering.
- YbAlO$_3$ exhibits dominant one-dimensional interactions along the c-axis.

## 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.