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MA: Fachverband Magnetismus

MA 66: Poster 3

MA 66.20: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG2

Study of spin reorientation in NdFe_0.5Mn_0.5O₃ — Ankita Singh¹, Avijeet Ray¹, Anil Kumar Jain², Padmanabhan Balasubramanian¹, Tulika Maitra¹, and •Vivek Kumar Malik¹ — ¹Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247 667, India — ²Solid State Physics Division, Bhabha Atomic Research Center, Mumbai, 400 085, India

The structural, magnetic, and electronic properties of NdFe_0.5Mn_0.5O₃ have been studied in detail using bulk magnetization, neutron/x-ray diffraction and first principle density functional theory. The material crystallizes in the orthorhombic Pbnm structure, where both Mn and Fe occupy the same crystallographic site (4b). Mn/Fe sublattice of the compound orders in to a G-type antiferromagnetic phase close to 250 K. The magnetic structure belongs to Γ₁ irreducible representation with spins aligned along the crystallographic b direction which is highly unusual, since most of the orthoferrites and orthochromites order in the Γ₄ representation below the Néel temperature. Below 70 K, the magnetic structure coexists as a sum of two irreducible representations (Γ₁+Γ₂) as seen from neutron diffraction. At 6 K, the magnetic structure belongs entirely to Γ₂ representation with spins aligned antiferromagnetically along the crystallographic c direction having a small ferromagnetic component (F_x). The unusual spin reorientation and correlation between magnetic ground state and electronic properties have been investigated using first principle calculations in the GGA+U+SO formalism.