Low Temperature Physics: 42, 1028 (2016); https://doi.org/10.1063/1.4971168
Fizika Nizkikh Temperatur: Volume 42, Number 11 (November 2016), p. 1311-1327    ( to contents , go back )

Effect of restricted geometry on superconducting properties of low-melting metals (Review Article)

Yu.A. Kumzerov1 and А.А. Naberezhnov1,2

1A.F. Ioffe Physico-Technical Institute RAN, 26 Politekhnicheskaja Str., St.-Petersburg 194021, Russia
E-mail: Yu.kumzerov@mail.ioffe.ru

2С.-Петербургский политехнический университет им. Петра Великого ул. Политехническая, 29, г. С.-Петербург, 195251, Россия
E-mail: alex.nabereznov@mail.ioffe.ru
pos Анотація:

Received May 10, 2016

Abstract

This contribution is a review of results obtained at studies of influence of artificially restricted geometry conditions on superconducting properties of nanoparticles of low-melting metals (Hg, Pb, Sn, In). The restricted geometry conditions have been achieved at embedding of melted metals under high pressure into two types of nanoporous matrices: channel structures on base of chrysotile asbestos and porous alkali-borosilicate glasses. The chrysotile asbestos is a system of parallel nanotubes with the channel diameter from 2 up to 20 nm and with an aspect ratio (length/channel diameter) up to ~ 107. The porous glasses have a random dendrite interconnected 3D net of channels (pores) with technologically regulated average pore diameter from 3 up to 30 nm. The temperature dependences of resistance and heat capacity in a vicinity of superconducting transition and the dependencies of critical temperatures vs. average pore diameters are presented. The values of critical magnetic fields are determined.

PACS: 74.25.–q Properties of superconductors;
PACS: 74.70.–b Superconducting materials other than cuprates;
PACS: 78.67.Rb Nanoporous materials.

Key words: superconductivity, restricted geometry, low-melting metals, nanocomposites.

Published online: September 26, 2016

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