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Magnetization and Neutron Diffraction Studies on Nanocrystalline Tetragonal SrFeO3−δ

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Abstract

Magnetization, AC susceptibility and neutron diffraction measurements are carried out on a nanocrystalline tetragonal SrFeO3−δ system prepared through solid-state reaction. Observed coercivity is due to uncompensated spins from the surface of the nanoparticle and broken bonds at the surface. Finite size effect plays a major role in hysteresis. The irreversibility in magnetization above the Néel temperature (T N) is due to the short-range correlation effect and the presence of local anisotropy field. Based on magnetization, AC susceptibility and neutron diffraction studies, we conclude that the nanocrystalline tetragonal SrFeO3−δ is an antiferromagnet with Néel temperature around 79 K.

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Acknowledgements

Dr. A. Sendil Kumar thanks the National Academy of Sciences (India) for the Research Associateship under the Scheme of Senior Scientist Platinum Jubilee Fellow awarded to Prof. Anil K. Bhatnagar. The authors thank the Centre for Nanotechnology and Central Instrumentation Laboratory (CIL) of the University of Hyderabad for the experimental facilities to carry out this work.

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Authors and Affiliations

  1. School of Physics, University of Hyderabad, Hyderabad, Telangana, 500046, India

    A. Sendil Kumar & S. Srinath

  2. UGC-DAE Consortium for Scientific Research, R-5 Shed, B.A.R.C., Mumbai, 400085, India

    P. D. Babu

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  1. A. Sendil Kumar
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  2. P. D. Babu
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  3. S. Srinath
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Correspondence to A. Sendil Kumar.

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Kumar, A.S., Babu, P.D. & Srinath, S. Magnetization and Neutron Diffraction Studies on Nanocrystalline Tetragonal SrFeO3−δ . J Supercond Nov Magn 30, 3155–3159 (2017). https://doi.org/10.1007/s10948-017-4125-2

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  • DOI: https://doi.org/10.1007/s10948-017-4125-2

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