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arXiv · 1709.06904

Magnetic ground state of the Ising-like antiferromagnet DyScO$_3$

L. S. Wu·S. E. Nikitin·M. Frontzek·A. I. Kolesnikov·G. Ehlers·M. D. Lumsden·K. A. Shaykhutdinov·E. -J. Guo·A. T. Savici·Z. Gai·A. S. Sefat·A. Podlesnyak
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Abstract

We report the low temperature magnetic properties of the DyScO$_3$ perovskite, which were characterized by means of single crystal and powder neutron scattering, and by magnetization measurements. Below $T_{\mathrm{N}}=3.15$ K, Dy$^{3+}$ moments form an antiferromagnetic structure with an easy axis of magnetization lying in the $ab$-plane. The magnetic moments are inclined at an angle of $\sim\pm{28}^{\circ}$ to the $b$-axis. We show that the ground state Kramers doublet of Dy$^{3+}$ is made up of primarily $|\pm 15/2\rangle$ eigenvectors and well separated by crystal field from the first excited state at $E_1=24.9$ meV. This leads to an extreme Ising single-ion anisotropy, $M_{\perp}/M_{\|}\sim{0.05}$. The transverse magnetic fluctuations, which are proportional to $M^{2}_{\perp}/M^{2}_{\|}$, are suppressed and only moment fluctuations along the local Ising direction are allowed. We also found that the Dy-Dy dipolar interactions along the crystallographic $c$-axis are 2-4 times larger than in-plane interactions.

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L. S. Wu, S. E. Nikitin, M. Frontzek, A. I. Kolesnikov, G. Ehlers, M. D. Lumsden, K. A. Shaykhutdinov, E. -J. Guo, A. T. Savici, Z. Gai, A. S. Sefat, A. Podlesnyak. 2017-09-20. Magnetic ground state of the Ising-like antiferromagnet DyScO$_3$. https://doi.org/10.1103/physrevb.96.144407

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