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

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 $|\pm 15/2⟩$ 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, $M_{\perp }/M_{\Vert }\sim 0.05$. The transverse magnetic fluctuations, which are proportional to $M_{\perp }^2/M_{\Vert }^2$, 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.

9 pages and 6 figures; to be published in Phys. Rev. B

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