
A polycrystalline sample LuCrO3 has been characterized by neutron powder diffraction (NPD) and magnetization measurements. Its crystal structure has been Rietveld refined from NPD data in space group Pnma; this perovskite contains strongly tilted CrO6 octahedra with extremely bent Cr—O—Cr superexchange angles of ∼142°. The NPD data show that below Néel temperature (T N ≃ 131 K), the magnetic structure can be defined as an A-type antiferromagnetic arrangement of Cr3+ magnetic moments, aligned along the b axis, with a canting along the c axis. A noticeable magnetostrictive effect is observed in the unit-cell parameters and volume upon cooling down across T N. The AC magnetic susceptibility indicates the onset of magnetic ordering below 112.6 K; the magnetization isotherms below T N show a nonlinear behaviour that is associated with the described canting of the Cr3+ magnetic moments. From the Curie–Weiss law, the effective moment of the Cr3+ sublattice is found to be μeff = 3.55 μB (calculated 3.7 μB) while the ΘCW parameter yields a value of −155 K, indicating antiferromagnetic interactions. There is a conspicuous increase of T N upon the application of external pressure, which must be due to shortening of the Cr—O bond length under compression that increases the orbital overlap integral.
Pressure-dependent magnetization, Lutetium chromite, Materiales, pressure increment of Néel temperature, G-type magnetic structure, lutetium chromite, Moment canting, Física, pressure-dependent magnetization, Pressure increment of Néel temperature, Magnetic Structures, moment canting
Pressure-dependent magnetization, Lutetium chromite, Materiales, pressure increment of Néel temperature, G-type magnetic structure, lutetium chromite, Moment canting, Física, pressure-dependent magnetization, Pressure increment of Néel temperature, Magnetic Structures, moment canting
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