Open AccessРазмерные зависимости магнитных свойств сверхпроводящих наноструктур свинца в пористом стекле
Author(s) -
Н.Ю. Михайлин,
Д.В. Шамшур,
Р.В. Парфеньев,
В.И. Козуб,
I. Galperin,
Ю.А. Кумзеров,
А.В. Фокин
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.06.45976.11m
Subject(s) - materials science , condensed matter physics , superconductivity , nanocomposite , magnetic field , flux (metallurgy) , porosity , magnetic moment , analytical chemistry (journal) , nanotechnology , chemistry , physics , composite material , metallurgy , quantum mechanics , chromatography
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.