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Enhancement of the colossal magnetoresistance in Eu1 − x Ca x B6

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Abstract

The transport and magnetic properties of single crystal samples of substitutional solid solutions Eu1 − x Ca x B6 (0 ≤ x ≤ 0.26) have been studied at temperatures 1.8–300 K in magnetic fields up to 80 kOe. It has been shown that an increase in the calcium concentration results in the suppression of the charge transport accompanied by an increase in the amplitude of the colossal magnetoresistance (CMR) up to the value (ρ(0) − ρ(H))/ρ(H) ≈ 7 × 105 detected for x = 0.26 at liquid-helium temperature in a field of 80 kOe. The transition from the hole-like conductivity to the electron-like conductivity has been observed in the Eu0.74Ca0.26B6 solid solution in the CMR regime at T < 40 K. The Hall mobility values μH = 200−350 cm2/(V s) estimated for charge carriers in the strongly disordered matrix of the Eu0.74Ca0.26B6 solid solution are comparable with the charge carrier mobility μH = 400−600 cm2/(V s) for the undoped EuB6 compound. The anomalous behavior of the transport and magnetic parameters of the Eu1 − x Ca x B6 solid solutions is discussed in terms of a metal-insulator transition predicted within the double exchange model for this system with low carrier density.

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Authors and Affiliations

  1. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia

    V. V. Glushkov, M. A. Anisimov, A. V. Bogach, S. V. Demishev, N. A. Samarin & N. E. Sluchanko

  2. Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudny, Moscow oblast, 141700, Russia

    V. V. Glushkov & M. A. Anisimov

  3. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, ul. Krzhyzhanovskogo, Kiev, 03680, Ukraine

    A. V. Dukhnenko, A. V. Levchenko, V. B. Filippov & N. Yu. Shitsevalova

  4. National Research Nuclear University MEPhI, Kashirskoe sh. 31, Moscow, 115409, Russia

    A. V. Kuznetsov & O. A. Churkin

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  1. V. V. Glushkov
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  2. M. A. Anisimov
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  3. A. V. Bogach
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  4. S. V. Demishev
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  5. A. V. Dukhnenko
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  6. A. V. Kuznetsov
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  7. A. V. Levchenko
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  8. N. A. Samarin
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  9. V. B. Filippov
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  10. O. A. Churkin
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  11. N. Yu. Shitsevalova
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  12. N. E. Sluchanko
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Correspondence to V. V. Glushkov.

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Original Russian Text © V.V. Glushkov, M.A. Anisimov, A.V. Bogach, S.V. Demishev, A.V. Dukhnenko, A.V. Kuznetsov, A.V. Levchenko, N.A. Samarin, V.B. Filippov, O.A. Churkin, N.Yu. Shitsevalova, N.E. Sluchanko, 2010, published in Zhurnal Éksperimental’noĭ i Teoretĭcheskoĭ Fiziki, 2010, Vol. 138, No. 2, pp. 277–281.

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Glushkov, V.V., Anisimov, M.A., Bogach, A.V. et al. Enhancement of the colossal magnetoresistance in Eu1 − x Ca x B6 . J. Exp. Theor. Phys. 111, 246–250 (2010). https://doi.org/10.1134/S1063776110080157

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  • DOI: https://doi.org/10.1134/S1063776110080157

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