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Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 66: Poster 3

MA 66.20: Poster

Friday, March 24, 2017, 09:30–13:00, P2-OG2

Study of spin reorientation in NdFe0.5Mn0.5O3Ankita Singh1, Avijeet Ray1, Anil Kumar Jain2, Padmanabhan Balasubramanian1, Tulika Maitra1, and •Vivek Kumar Malik11Department 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 NdFe0.5Mn0.5O3 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 (Γ12) 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 (Fx). 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.

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