Impurities in multiband superconductors

M.M. Korshunov^a, b, Yu.N. Togushova^c, O.V. Dolgov^d, e
^aKirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Academgorodok 50, str. 38, Krasnoyarsk, 660036, Russian Federation
^bMax-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, Dresden, D-01187, Germany
^cSiberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, 660041, Russian Federation
^dLebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
^eMax-Planck Institut für Festkörperforschung, Stuttgart, Germany

Disorder — impurities and defects violating the ideal order — is always present in solids. It can result in interesting and sometimes unexpected effects in multiband superconductors. Especially if the superconductivity is unconventional thus having other than usual s-wave symmetry. This paper uses the examples of iron-based pnictides and chalcogenides to examine how both nonmagnetic and magnetic impurities affect superconducting states with s_± and s₊₊ order parameters. We show that disorder causes the transition between s_± and s₊₊ states and examine what observable effects this transition can produce.

Keywords: unconventional superconductors, iron pnictides, iron chalcogenides, impurity scattering
PACS: 74.20.Rp, 74.25.−q, 74.62.Dh (all)
DOI: 10.3367/UFNe.2016.07.037863
URL: https://ufn.ru/en/articles/2016/12/c/
Web of Science

000396007200002
Scopus

2-s2.0-85014928973
ADS NASA

2016PhyU...59.1211K
Citation: Korshunov M M, Togushova Yu N, Dolgov O V "Impurities in multiband superconductors" Phys. Usp. 59 1211–1240 (2016)

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Received: 18th, May 2016, revised: 8th, July 2016, accepted: 13th, July 2016

Оригинал: Коршунов М М, Тогушова Ю Н, Долгов О В «Примеси в многозонных сверхпроводниках» УФН 186 1315–1347 (2016); DOI: 10.3367/UFNr.2016.07.037863