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Ferromagnetism in diluted Pb1 − x − y Ge x Cr y Te magnetic semiconductors

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Abstract

Magnetic properties of Pb1 − x − y Ge x Cr y Te alloys (x = 0.02–0.20, y = 0.01–0.08) were studied. It was detected that the magnetic susceptibility of alloys consists of two contributions: the paramagnetic Curie-Weiss part (the temperature region is T < 50 K) caused, probably, by the Cr3+ ion paramagnetism, and the high-temperature ferromagnetic part (T < 300 K). The dependences of the concentration of magnetic centers on the composition of the matrix were obtained from the paramagnetic and ferromagnetic contributions. It was shown that a decrease in the concentration of paramagnetic centers can be, at least qualitatively, explained by the transformation of the electronic structure as the germanium concentration increases. A phenomenological model was suggested, which explains the behavior of magnetic properties as the chromium content increases, and possible mechanisms of ferromagnetic ordering in studied alloys are discussed.

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Authors and Affiliations

  1. Faculty of Physics, Moscow State University, Moscow, 119991, Russia

    E. P. Skipetrov, M. G. Mikheev, F. A. Pakpour & L. A. Skipetrova

  2. Faculty of Materials Science, Moscow State University, Moscow, 119991, Russia

    N. A. Pichugin

  3. Institute of Materials Science Problems, National Academy of Sciences of Ukraine, Chernovtsy, 274001, Ukraine

    E. I. Slyn’ko & V. E. Slyn’ko

Authors
  1. E. P. Skipetrov
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  2. M. G. Mikheev
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  3. F. A. Pakpour
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  4. L. A. Skipetrova
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  5. N. A. Pichugin
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  6. E. I. Slyn’ko
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  7. V. E. Slyn’ko
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Correspondence to E. P. Skipetrov.

Additional information

Original Russian Text © E.P. Skipetrov, M.G. Mikheev, F.A. Pakpour, L.A. Skipetrova, N.A. Pichugin, E.I. Slyn’ko, V.E. Slyn’ko, 2009, published in Fizika i Tekhnika Poluprovodnikov, 2009, Vol. 43, No. 3, pp. 316–323.

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Skipetrov, E.P., Mikheev, M.G., Pakpour, F.A. et al. Ferromagnetism in diluted Pb1 − x − y Ge x Cr y Te magnetic semiconductors. Semiconductors 43, 297–304 (2009). https://doi.org/10.1134/S1063782609030075

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  • DOI: https://doi.org/10.1134/S1063782609030075

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