Abstract
The specific heat of the ZrB12 compound in the normal and superconducting states (T C ≈ 6 K) has been studied in the 1.9–7 K temperature range for high-quality single crystals with different relative contents of boron isotopes. For Zr10B12, ZrnatB12, and Zr11B12 dodecaborides, the electron density of states and the electronphonon coupling constant, λe-ph ∼ 0.4, are found. The dependence of the thermodynamic and upper critical fields, as well as of the Ginzburg-Landau parameter (κ = 0.8–1.14) on temperature and isotope composition is determined. The results suggest the existence of the magnetic field induced phase transition at T* = 4–5 K, which is not related to the transition from type-I to type-II superconductivity. The possibilities of the existence of two-gap superconductivity and a structural phase transition at T* in zirconium dodecaboride are discussed.
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Original Russian Text © N.E. Sluchanko, A.N. Azarevich, A.V. Bogach, S.Yu. Gavrilkin, V.V. Glushkov, S.V. Demishev, A.V. Dukhnenko, A.B. Lyashchenko, K.V. Mitsen, V.B. Filipov, 2011, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2011, Vol. 94, No. 8, pp. 685–689.
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Sluchanko, N.E., Azarevich, A.N., Bogach, A.V. et al. 10B–11B isotope substitution and superconductivity in ZrB12 . Jetp Lett. 94, 642–646 (2011). https://doi.org/10.1134/S0021364011200136
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DOI: https://doi.org/10.1134/S0021364011200136