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Abstract:
We report on the low-temperature magnetic properties of the DyScO3 perovskite, which were characterized by means of single crystal and powder neutron scattering, and by magnetization measurements. Below T-N = 3.15 K, Dy3+ 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 similar to +/- 28 degrees to the b axis. We show that the ground-state Kramers doublet of Dy3+ is made up of primarily |+/- 15/2 > eigenvectors and well separated by a crystal field from the first excited state at E-1 = 24.9 meV. This leads to an extreme Ising single-ion anisotropy, M-perpendicular to/M-parallel to similar to 0.05. The transverse magnetic fluctuations, which are proportional to M-perpendicular to(2)/M-parallel to(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 two to four times larger than in-plane interactions.
