Size Dependences of the Magnetic Properties of Superconducting Lead–Porous Glass Nanostructures

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...

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Bibliographic Details
Published in:Physics of the solid state 2018-06, Vol.60 (6), p.1068-1072
Main Authors: Mikhailin, N. Yu, Shamshur, D. V., Parfen’ev, R. V., Kozub, V. I., Gal’perin, Yu. M., Kumzerov, Yu. A., Fokin, A. V.
Format: Article
Language:English
Subjects:
CRITICAL TEMPERATURE
GLASS
LEAD
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
Magnetism
NANOCOMPOSITES
NANOSCIENCE AND NANOTECHNOLOGY
Nanostructure
NANOSTRUCTURES
PERIODICITY
Physics
Physics and Astronomy
PORE STRUCTURE
Porosity
POROUS MATERIALS
Porous media
Solid State Physics
Superconductivity
Superconductors
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Summary: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 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.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783418060215