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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2011, Volume 94, Issue 8, Pages 685–689
(Mi jetpl2364)
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This article is cited in 10 scientific papers (total in 10 papers)
CONDENSED MATTER
$^{10}$B–$^{11}$B isotope substitution and superconductivity in ZrB$_{12}$
N. E. Sluchankoa, A. N. Azarevichab, A. V. Bogacha, S. Yu. Gavrilkinc, V. V. Glushkovab, S. V. Demishevab, A. V. Dukhnenkod, A. B. Lyashchenkod, K. V. Mitsene, V. B. Filipovd a General Physics Institute named after A. M. Prokhorov, Russian Academy of Sciences
b Moscow Institute of Physics and Technology
c P. N. Lebedev Physical Institute, Russian Academy of Sciences
d Frantsevich Institute of Materials Science Problems, National Academy of Sciences of Ukraine
e P.N.Lebedev Physical Institute, the USSR Academy of Sciences
Abstract:
The specific heat of the ZrB$_{12}$ compound in the normal and superconducting states ($T_C\approx6$ 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 Zr$^{10}$B$_{12}$, Zr$^{\rm nat}$B$_{12}$, and Zr$^{11}$B$_{12}$ dodecaborides, the electron density of states and the electronphonon coupling constant, $\lambda _{\rm e{-}ph}\sim0.4$, are found. The dependence of the thermodynamic and upper critical fields, as well as of the Ginzburg-Landau parameter ($\kappa =0.8$–$1.14$) 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.
Received: 22.07.2011 Revised: 09.09.2011
Citation:
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, “$^{10}$B–$^{11}$B isotope substitution and superconductivity in ZrB$_{12}$”, Pis'ma v Zh. Èksper. Teoret. Fiz., 94:8 (2011), 685–689; JETP Letters, 94:8 (2011), 642–646
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https://www.mathnet.ru/eng/jetpl2364 https://www.mathnet.ru/eng/jetpl/v94/i8/p685
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Abstract page: | 276 | Full-text PDF : | 80 | References: | 59 |
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