Magnetic structure of undistorted hexagonal ferrites, Lu0.2In0.8FeO3

Abstract

We report on the crystal and magnetic structure of bulk hexagonal (Lu,In)FeO3. Neutron powder diffraction revealed that Lu0.2In0.8FeO3 has a single-phase P63/mmc structure down to T ≈ 3 K and shows an antiferromagnetic transition at TN ≈ 164 K. Unlike the distorted hexagonal LuFeO3 family with an A2(Γ2)-type spin configuration, undistorted hexagonal Lu0.2In0.8FeO3 shows either an A1(Γ1) or a B1(Γ3)-type spin configuration below TN, which does not produce the c-directional canted ferromagnetic moment. A significant reduction in the ordered magnetic moment was observed at 3 K without trimerization, and hints of a magnetic cluster state were observed in the paramagnetic phase near room temperature. Therefore, the system presents a rare example to study the geometrically frustrated magnetism in the undistorted hexagonal magnet that has a perfect triangular lattice below room temperature.

Structural, Electrical, and Magnetic Properties of Hexagonal Lu0.5−xZrxSc0.5FeO3 Ceramics

“…The characteristic Bragg peaks of the polar P6 3 cm space group are observed near 23° and 35.5°, suggesting ferroelectric property, which originates from the unit cell tripling distorted from nonpolar P6 3 /mmc . [ 28 ] Figure 2c–e shows the experimental and refined XRD curves for LSFO, LZSFO0.02, and LZSFO0.05. The detailed refinement cell parameters and reliability factors varying with x are displayed in Table 1 .…”