This article is cited in 4 papers

Superconductivity

Superconducting properties of tin embedded in nanometer-sized pores of glass

A. A. Shikov^ab, M. G. Zemlyanov^a, P. P. Parshin^a, A. A. Naberezhnov^cd, Yu. A. Kumzerov<sup>c

a</sup> National Research Centre "Kurchatov Institute", Moscow
^b Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region
^c Ioffe Institute, St. Petersburg
^d St. Petersburg Polytechnic University

Abstract: The electrical resistance of tin embedded from a melt in porous glasses with an average pore diameter of $\sim$7 nm has been investigated at low temperatures in magnetic fields up to 2 T. The temperatures of the transition to the superconducting state for nanocrystalline tin have been determined in magnetic fields of 0, 0.3, 0.5, 1.0, 1.5, and 2.0 T. It has been found that the temperature and magnetic-field dependences of the electrical resistance of the nanocomposite under investigation exhibit two transitions to the superconducting state. The nature of the double superconducting transitions has been discussed. The $H_c$–$T_c$ phase diagram has been constructed using the entire set of data on the magnetic-field and temperature dependences of the electrical resistance of nanostructured tin. This phase diagram indicates that the upper critical magnetic field $H_{c2}$(0) for nanostructured tin is almost two orders of magnitude higher than the corresponding field for bulk tin.

Received: 24.04.2012

 English version: Physics of the Solid State, 2012, 54:12, 2345–2350

Bibliographic databases:

•