Josephson π-junctions and Andreev current-transport 'engineering' in S—N/F—S nanostructures

V.V. Ryazanov^†^a, b, T.E. Golikova^a, V.V. Bol’ginov^a, I.V. Bobkova^b, A.M. Bobkov^b
^aOsipyan Institute of Solid State Physics, Russian Academy of Sciences, Akademika Osip'yana str. 2, Chernogolovka, Moscow Region, 142432, Russian Federation
^bMoscow Institute of Physics and Technology (National Research University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141701, Russian Federation

We present a review of studies of two types of Josephson π-junctions, i.e., Josephson structures with an inverse current—phase relation. In particular, we discuss the features of the transition to the π-state of Josephson superconductor—ferromagnet—superconductor sandwiches (Josephson SFS junctions). At the same time, much attention is devoted to the 'Andreev' coherent transport in planar superconductor—normal metal—superconductor structures (Josephson SNS junctions) and transitions to the π-state caused by a nonequilibrium electron distribution in a Josephson junction with a normal metal barrier. We also discuss in detail various types of nonequilibrium distributions arising in hybrid JosephsonS—N/F—S structures upon injection of spin-polarized carriers into the Josephson barrier and the features of Andreev current transport due to contacts between a normal metal and a ferromagnet in the Josephson barrier. The review relies mainly on the works performed with the participation of the authors.

Keywords: superconductivity, Josephson effect, inverse phase difference across junctions, π-junctions, Josephson barriers with nonequilibrium electron distribution
PACS: 72.25.Hg, 74.78.−w, 74.45.+c (all)
DOI: 10.3367/UFNe.2024.12.039922
URL: https://ufn.ru/en/articles/2025/7/i/
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2-s2.0-105013769063
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2025PhyU...68..717R
Citation: Ryazanov V V, Golikova T E, Bol’ginov V V, Bobkova I V, Bobkov A M "Josephson π-junctions and Andreev current-transport 'engineering' in S—N/F—S nanostructures" Phys. Usp. 68 717–727 (2025)

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Received: 18th, December 2024, accepted: 18th, December 2024

Оригинал: Рязанов В В, Голикова Т Е, Больгинов В В, Бобкова И В, Бобков А М «Джозефсоновские π-контакты и "инженерия" андреевского токопереноса в S—N/F—S наноструктурах» УФН 195 766–777 (2025); DOI: 10.3367/UFNr.2024.12.039922

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