Abstract
Superconducting structures Pb–PG formed by filling a porous glass matrix with the lead from melt under pressure have been investigated. Samples with characteristic pore structure diameters of d ≈ 7, 3, and 2 nm have been studied. It has been found that the critical temperature of the superconducting transition in the samples under study is similar to the corresponding value Tc ≈ 7.2 K for bulk lead. At the same time, it has been observed that the critical magnetic field of the nanocomposites, which attains Hc(T = 0 K) ≈ 165 kOe for Pb–PG (3 nm), exceeds several times the value Hc(0) = 803 Oe for bulk lead. The low-temperature magnetic- field dependences of magnetic moment M(H) contain quasi-periodic flux jumps, which vanish with a decrease in the lead nanostructure diameter. A qualitative model of the observed effects is considered.
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Original Russian Text © N.Yu. Mikhailin, D.V. Shamshur, R.V. Parfen’ev, V.I. Kozub, Yu.M. Gal’perin, Yu.A. Kumzerov, A.V. Fokin, 2018, published in Fizika Tverdogo Tela, 2018, Vol. 60, No. 6, pp. 1058–1061.
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Mikhailin, N.Y., Shamshur, D.V., Parfen’ev, R.V. et al. Size Dependences of the Magnetic Properties of Superconducting Lead–Porous Glass Nanostructures. Phys. Solid State 60, 1068–1072 (2018). https://doi.org/10.1134/S1063783418060215
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DOI: https://doi.org/10.1134/S1063783418060215