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Magnetoresistive properties of cold-pressed CrO2 powder, prepared by hydrothermal synthesis

  • Proceedings of the International Symposium “Order, Disorder, and Properties of Oxides” (ODPO-11)
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Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

The resistive, magnetoresistive and magnetic properties of cold-pressed CrO2, powder prepared by hydrothermal synthesis from chromic anhydride have been studied. The powder particles (with a mean diameter of about 120 nm) were nearly spherical. The particles stabilized with a β-CrOOH surface layer. The powder compact (with a Curie temperature of about 385 K) revealed nonmetallic temperature behavior of the resistance (with an R(T) dependence close to exponential at T < 20 K). A giant negative magnetoresistance (MR) (∼20% at T ≈ 5K) is found. MR decreased rapidly with an increase in temperature (to 0.3% at T > 200 K). Such MR behavior is shown to be typical of a system of magnetic grains with magnetic (spin-dependent) tunneling.

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Authors and Affiliations

  1. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov, 61103, Ukraine

    B. I. Belevtsev, N. V. Dalakova & E. Yu. Belyaev

  2. St. Petersburg State University, St. Petersburg, 199034, Russia

    M. G. Osmolovsky & A. A. Selyutin

Authors
  1. B. I. Belevtsev
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  2. N. V. Dalakova
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  3. M. G. Osmolovsky
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  4. E. Yu. Belyaev
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  5. A. A. Selyutin
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Corresponding author

Correspondence to B. I. Belevtsev.

Additional information

Original Russian Text © B.I. Belevtsev, N.V. Dalakova, M.G. Osmolovsky, E.Yu. Belyaev, A.A. Selyutin, 2009, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2009, Vol. 73, No. 8, pp. 1192–1195.

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Belevtsev, B.I., Dalakova, N.V., Osmolovsky, M.G. et al. Magnetoresistive properties of cold-pressed CrO2 powder, prepared by hydrothermal synthesis. Bull. Russ. Acad. Sci. Phys. 73, 1130–1133 (2009). https://doi.org/10.3103/S1062873809080334

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  • DOI: https://doi.org/10.3103/S1062873809080334

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