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Isotope effect in charge transport of LuB12

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Abstract

The galvanomagnetic properties of single-crystal samples with various isotopic boron compositions have been investigated for the first time for the normal state of superconductor LuB12 (T c ≈ 0.44 K). Precision measurements of the resistivity, Hall coefficient, and magnetic susceptibility have been performed over a wide temperature range of 2–300 K in magnetic fields up to 80 kOe. A change of the charge transport regime in this nonmagnetic compound with metallic conduction is shown to occur near T* ≈ 50−70 K. As a result, a sharp peak with significantly different amplitudes for Lu10B12 and Lu11B12 is recorded in the temperature dependences of the Hall coefficient R H(T) near T*. A significant (about 10%) difference (in absolute value) of the Hall coefficients R H for the Lu10B12 and Lu11B12 compounds at helium and intermediate temperatures has been found and the patterns of behavior of the dependence R H(H) for T < T* in an external magnetic field H ≤ 80 kOe for Lu10B12 and Lu11B12 are shown to differ significantly. Analysis of the Curie-Weiss contribution to the magnetic susceptibility χ(T) leads to the conclusion about the formation of magnetic moments μeff ≈ (0.13−0.19)μB in each unit cell of the fcc structure of LuB12 compounds with various isotopic compositions. The possibility of the realization of an electronic topological 2.5-order transition near T* and the influence of correlation effects in the 5d-band on the formation of a spin polarization near the rare-earth ions in LuB12 is discussed.

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Authors and Affiliations

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

    N. E. Sluchanko, A. N. Azarevich, A. V. Bogach, V. V. Glushkov, S. V. Demishev, A. V. Kuznetsov & K. S. Lyubshov

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

    A. N. Azarevich, V. V. Glushkov, S. V. Demishev & K. S. Lyubshov

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

    A. V. Kuznetsov

  4. Institute for Problems of Material Science, National Academy of Sciences of Ukraine, Kiev, 03680, Ukraine

    V. B. Filippov & N. Yu. Shitsevalova

Authors
  1. N. E. Sluchanko
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  2. A. N. Azarevich
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  3. A. V. Bogach
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  4. V. V. Glushkov
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  5. S. V. Demishev
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  6. A. V. Kuznetsov
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  7. K. S. Lyubshov
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  8. V. B. Filippov
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  9. N. Yu. Shitsevalova
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Correspondence to N. E. Sluchanko.

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Original Russian Text © N.E. Sluchanko, A.N. Azarevich, A.V. Bogach, V.V. Glushkov, S.V. Demishev, A.V. Kuznetsov, K.S. Lyubshov, V.B. Filippov, N.Yu. Shitsevalova, 2010, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 138, No. 2, pp. 315–320.

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Sluchanko, N.E., Azarevich, A.N., Bogach, A.V. et al. Isotope effect in charge transport of LuB12 . J. Exp. Theor. Phys. 111, 279–284 (2010). https://doi.org/10.1134/S1063776110080212

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  • DOI: https://doi.org/10.1134/S1063776110080212

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