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Structural and Magnetic Properties of Co(Cr1−y Al y )2O4 (y=0.0–0.2) Compounds

Journal of Superconductivity and Novel Magnetism volume 26, pages 1607–1610 (2013)Cite this article

Abstract

We present the structural and magnetic properties of Co(Cr1−y Al y )2O4 compounds prepared by the sol-gel technique for y=0.00,0.025,0.05,0.075,0.10,0.15 and 0.20. It has been observed that non-magnetic Al+3 substitution for Cr+3 enhances the magnetization at low temperatures compared to that of the parent compound. With increase in Al concentration spiral magnetic transition observed at around 24 K becomes less prominent, without affecting the ferrimagnetic transition temperature at around 97 K. The saturation magnetization values after subtracting the paramagnetic contribution vary from 0.036 μB/f.u to 0.376 μB/f.u. The enhanced ferromagnetic interaction and resultant magnetization could be explained in terms of decrease in Cr+3–O–Cr+3 bond angle with increase in doping concentration.

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References

  1. Eerenstein, W., Mathur, N.D., Scott, J.F.: Multiferroic and magnetoelectric materials. Nature 442, 759–765 (2006)

    ADS  Article  Google Scholar 

  2. Yamasaki, Y., Miyasaka, S., Kaneko, Y., He, J.-P., Arima, T., Tokura, Y.: Magnetic reversal of the ferroelectric polarization in a multiferroic spinel oxide. Phys. Rev. Lett. 96, 207204 (2006)

    ADS  Article  Google Scholar 

  3. Katsura, H., Nagaosa, N., Balatsky, A.V.: Spin current and magnetoelectric effect in noncollinear magnets. Phys. Rev. Lett. 95, 057205 (2005)

    ADS  Article  Google Scholar 

  4. Menyuk, N., Dwight, K., Wold, A.: Ferrimagnetic spiral configurations in cobalt chromite. J. Phys. 25(5), 528–536 (1964)

    Article  Google Scholar 

  5. Chang, L.J., Huang, D.J. Li, W.-H. Cheong, S.-W. Ratcliff, W. Lynn, J.W. Crossover from incommensurate to commensurate magnetic orderings in CoCr2O4. J. Phys. Condens. Matter 21, 456008 (2009)

    ADS  Article  Google Scholar 

  6. Pronin, A.V., Uhlarz, M., Beyer, R., Fischer, T., Wosnitza, J., Gorshunov, B.P., Komandin, G.A., Prokhorov, A.S., Dressel, M., Bush, A.A., Torgashev, V.I.: B–T phase diagram of CoCr2O4 in magnetic fields up to 14 T. Phys. Rev. B 85, 012101 (2012)

    ADS  Article  Google Scholar 

  7. Lawes, G., Melot, B., Page, K., Ederer, C., Hayward, M.A., Proffen, Th., Seshadri, R.: Dielectric anomalies and spiral magnetic order in CoCr2O4. Phys. Rev. B 74, 024413 (2006)

    ADS  Article  Google Scholar 

  8. Tristan, N., Hemberger, J., Krimmel, A., Krug von Nidda, H.A., Tsurkan, V., Loidl, A.: Geometric frustration in the cubic spinels MAl2O4 (M = Co, Fe, and Mn). Phys. Rev. B 72(17), 174404 (2005)

    ADS  Article  Google Scholar 

  9. Melot, B.C., Page, K., Seshadri, R., Stoudenmire, E.M., Balent, L., Bergman, D.L., Proffen, T.: Phys. Rev. B 80(10), 104420 (2009)

    ADS  Article  Google Scholar 

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Acknowledgements

R.P. acknowledges Ulhas V. Vaidya for his help in the experiments and B. Samantaray, N.S. Sangeetha and S. Mohanty for their help in Rietveld refinement with the FULL PROFF program.

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Authors and Affiliations

  1. Department of Physics, Indian Institute of Technology Guwahati, Guwahati, 781039, India

    R. Padam, D. Pal & S. Ravi

  2. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, 400005, India

    A. K. Grover & S. Ramakrishnan

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  1. R. Padam
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  2. D. Pal
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  3. S. Ravi
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  4. A. K. Grover
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  5. S. Ramakrishnan
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Correspondence to D. Pal.

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Padam, R., Pal, D., Ravi, S. et al. Structural and Magnetic Properties of Co(Cr1−y Al y )2O4 (y=0.0–0.2) Compounds. J Supercond Nov Magn 26, 1607–1610 (2013). https://doi.org/10.1007/s10948-012-1924-3

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  • DOI: https://doi.org/10.1007/s10948-012-1924-3

Keywords

  • Spinels
  • Oxides and magnetism