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Effect of Size Reduction on Magnetic Ordering in Sm1−x Ca x MnO3 (x = 0.35, 0.65 and 0.92) Manganites: Magnetic and EMR Studies

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Abstract

We have employed the highly sensitive electron magnetic resonance technique complimented by magnetization measurements to study the impact of size reduction on the magnetic ordering in nanosized Sm1−x Ca x MnO3 (x = 0.35, 0.65 and 0.92). In the bulk form, x = 0.35 sample shows a charge ordering transition at 235 K followed by a mixed magnetic phase, the sample with x = 0.65 exhibits charge order below 275 K and shows an antiferromagnetic insulator phase below 135 K while that with x = 0.92 has a ferromagnetic-cluster glass ground state. Thus, a comparative study of magnetic ground states of bulk and nanoparticles (diameter ~25 nm) enables us to investigate size-induced effects on different types of magnetic ordering. It is seen that in the bulk samples the temperature dependences of the EPR parameters are quite different from each other. This difference diminishes for the nanosamples where all the three samples show qualitatively similar behavior. The magnetization measurements corroborate this conclusion.

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Acknowledgments

S.V.B. thanks University Grants Commission (UGC) and Indian National Science Academy (INSA) for financial support. K.N.A. acknowledges Visvesvaraya Technological University for project funds. L.R.G. acknowledges University Grants Commission for a teacher fellowship award.

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Authors and Affiliations

  1. Department of Physics, Dr. Ambedkar Institute of Technology, Bangalore, 560056, India

    Lora Rita Goveas & K. N. Anuradha

  2. Department of Physics, Indian Institute of Science, Bangalore, 560012, India

    K. S. Bhagyashree & S. V. Bhat

  3. St. Joseph’s College of Arts and Science, Bangalore, 560027, India

    Lora Rita Goveas

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  1. Lora Rita Goveas
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  2. K. S. Bhagyashree
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Correspondence to Lora Rita Goveas.

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Goveas, L.R., Bhagyashree, K.S., Anuradha, K.N. et al. Effect of Size Reduction on Magnetic Ordering in Sm1−x Ca x MnO3 (x = 0.35, 0.65 and 0.92) Manganites: Magnetic and EMR Studies. Appl Magn Reson 46, 967–976 (2015). https://doi.org/10.1007/s00723-015-0647-6

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  • DOI: https://doi.org/10.1007/s00723-015-0647-6

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