Abstract
AbstractSuperconducting 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 T _ c ≈ 7.2 K for bulk lead. At the same time, it has been observed that the critical magnetic field of the nanocomposites, which attains H _ c ( T = 0 K) ≈ 165 kOe for Pb–PG (3 nm), exceeds several times the value H _ c (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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