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Magnetic ground state of the Ising-like antiferromagnet DyScO3


Nikitin,  S. E.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wu, L. S., Nikitin, S. E., Frontzek, M., Kolesnikov, A. I., Ehlers, G., Lumsden, M. D., et al. (2017). Magnetic ground state of the Ising-like antiferromagnet DyScO3. Physical Review B, 96(14): 144407, pp. 1-9. doi:10.1103/PhysRevB.96.144407.

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.