Fizika Nizkikh Temperatur: Volume 43, Number 9 (September 2017), p. 1263-1294    ( to contents , go back )

Proximity effects and Josephson effect in the microstructures on the base of multiband superconductors (Review Article)

Y. Yerin1,2 and A.N. Omelyanchouk2

1Institute for Physics of Microstructures RAS, Nizhny Novgorod, 603950, Russia

2B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: yuriyyerin@gmail.com

Received February 20, 2017, revised March 28, 2017

Abstract

Appearing in 50-ies of XX Century the multiband superconductivity was considered for a long time as an approximate model in the form of generalization of the BCS theory on the case of two bands for more precise quantitative description of properties and characteristics of the superconductors such as: cuprates, heavy fermions compounds, metal boron carbides, fullerides, strontium ruthenate etc. due to their complex piece-wise-continuous Fermi surfaces. However the discovery of multiband structure of the superconducting state in magnesium diborid in 2001 and in iron oxypnictides and halides in 2008 led to the appearance of many papers in which effects and different dependences well known for usual one-band s-wave superconductors were investigated anew. The main purpose of these investigations consisted in revealing the symmetry type of the order parameter to obtain important information about mechanism of Cooper pairing in these superconductors. One of the most effective methods to obtain information about symmetry properties of the order parameter in the multiband superconductors is phase-sensitive method. This review summarizes results of theoretical and experimental investigations of the proximity effect and Josephson effect in the systems based on multiband superconductors contacted with normal metals, insulators and other superconductors.

PACS: 74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions;
PACS: 74.50.+r Tunneling phenomena; Josephson effects.

Key words: multiband superconductor, BCS, order parameter symmetry.

Published online: July 25, 2017

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