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Manganese-mediated ferromagnetism in La2Fe1−x Mn2x Cr1−x O6 perovskite oxides

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Abstract

We have investigated the structure and magnetic properties of the perovskite oxides of the formula La2Fe1−x Mn2x Cr1−x O6 (0 < x < 1.0). For 0 < x ≤ 0.5, the members adopt the orthorhombic (Pbnm) structure, where the transition metal atoms are disordered at the 4b sites and the MO6 (M = Fe, Mn, Cr) octahedra become increasingly distorted with increasing x. For 0.65 ≤ x < 1.0, the members adopt the rhombohedral (R-3c) structure that is similar to LaMnO3+δ (δ ≥ 0.1) where the MO6 octahedra are undistorted. While the magnetic properties of the latter series are largely similar to the parent LaMnO3+δ arising from the double-exchange (DE) between mixed valent MnIII/MnIV, the magnetic properties of the orthorhombic members show a distinct (albeit weak) ferromagnetism (T C ∼ 200 K) that seems to arise from a MnIII-mediated superexchange (SE) between FeIII/CrIII in the disordered perovskite structure containing FeIII, MnIII and CrIII.

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Authors and Affiliations

  1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560 012, India

    R. M. Tiwari, Abanti Nag, N. Y. Vasanthacharya & J. Gopalakrishnan

  2. Department of Physics, St. Xavier’s College, Ahmedabad, 380 009, India

    Mrudul Gadhvi

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  1. R. M. Tiwari
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  2. Mrudul Gadhvi
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  3. Abanti Nag
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  4. N. Y. Vasanthacharya
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  5. J. Gopalakrishnan
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Correspondence to J. Gopalakrishnan.

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Tiwari, R.M., Gadhvi, M., Nag, A. et al. Manganese-mediated ferromagnetism in La2Fe1−x Mn2x Cr1−x O6 perovskite oxides. J Chem Sci 122, 529–538 (2010). https://doi.org/10.1007/s12039-010-0087-7

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  • DOI: https://doi.org/10.1007/s12039-010-0087-7

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