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Percolation effects in the conductivity and magnetoresistance of compacted chromium dioxide powder

  • Proceedings of the International Symposium “Order, Disorder, and Properties of Oxides (ODPO-12)”
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Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

The resistive and magnetoresistive properties of a submicron (120 nm) compacted CrO2 powder with a Curie temperature of ∼385 K were investigated in the temperature range of 5–430 K for magnetic fields of up to 1.6 T. The specimen revealed a nonmetallic temperature dependence of resistance and high negative magnetoresistance (MR) (20%) in a low-temperature range. The MR magnitude rapidly decreased with an increase in temperature and was less than 0.3% for T > 200 K. Such MR behavior is shown to be characteristic for granular systems with spin-dependent intergranular tunneling. Some features of MR behavior in a low-temperature range (lower than 40 K) can be attributed to the percolation nature of the tunnel conductivity of such a granular system in the presence of a limited number of dominant conducting current paths.

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Authors and Affiliations

  1. Verkin Physicotechnical Institute of Low Temperatures, Kharkov, 61103, Ukraine

    B. I. Belevtsev, N. V. Dalakova, E. Yu. Beliayev & Yu. A. Kolesnichenko

  2. St. Petersburg State University, St. Petersburg, 198504, Russia

    M. G. Osmolowsky & A. A. Selutin

Authors
  1. B. I. Belevtsev
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  2. N. V. Dalakova
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  3. M. G. Osmolowsky
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  4. E. Yu. Beliayev
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  5. A. A. Selutin
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  6. Yu. A. Kolesnichenko
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Corresponding author

Correspondence to B. I. Belevtsev.

Additional information

Original Russian Text © B.I. Belevtsev, N.V. Dalakova, M.G. Osmolowsky, E.Yu. Beliayev, A.A. Selutin, Yu.A. Kolesnichenko, 2010, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2010, Vol. 74, No. 8, pp. 1111–1114.

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Belevtsev, B.I., Dalakova, N.V., Osmolowsky, M.G. et al. Percolation effects in the conductivity and magnetoresistance of compacted chromium dioxide powder. Bull. Russ. Acad. Sci. Phys. 74, 1062–1065 (2010). https://doi.org/10.3103/S1062873810080071

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  • DOI: https://doi.org/10.3103/S1062873810080071

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