Josephson current in ferromagnet-superconductor tunnel junctions

Li, Xiaowei; Xing, D. Y.; Sun, Guan; Dong, Zhengchao

doi:10.1103/physrevb.65.134507

Cited by 36 publications

(39 citation statements)

References 16 publications

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“…The conditions under which the π− state is realized in S/F/S Josephson junctions of different types were studied theoretically in many papers Buzdin and Kupriyanov, 1991;Buzdin and Vujicic, 1992;Krivoruchko and Koshina, 2001a;Li et al, 2002). In all these papers it was assumed that the ferromagnet consisted of a single domain with a magnetization M fixed in space.…”

Section: The Josephson Effect In Sfs Junctionsmentioning

confidence: 99%

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Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures

2005

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We consider novel unusual effects in superconductor-ferromagnet (S/F) structures. In particular we analyze the triplet component (TC) of the condensate generated in those systems.This component is odd in frequency and even in the momentum, which makes it insensitive to non-magnetic impurities. If the exchange field is not homogeneous in the system the triplet component is not destroyed even by a strong exchange field and can penetrate the ferromagnet over long distances. Some other effects considered here and caused by the proximity effect are: enhancement of the Josephson current due to the presence of the ferromagnet, induction of a magnetic moment in superconductors resulting in a screening of the magnetic moment, formation of periodic magnetic structures due to the influence of the superconductor, etc. We compare the theoretical predictions with existing experiments.

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Section: The Josephson Effect In Sfs Junctionsmentioning

confidence: 99%

“…However, this is true only for such a simple geometry. For samples of more complicated shapes the behavior of the DOS ν(ǫ) depends on whether the electron dynamics in the N region is chaotic or integrable Lodder and Yu.V.Nazarov, 1998;Melsen et al, 1996;Pilgram et al, 2000;Taras-Semchuk and Altland, 2001).…”

Section: A Superconductor-normal Metal Structuresmentioning

confidence: 99%

Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures

2005

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“…When a ferromagnetic order parameter with an exchange field coexists with superconductivity, there is an upper critical exchange field in which a first-order phase transition takes place from superconducting to normal state [18]. The upper exchange field may be determined by following the argument of [19,20].…”

Section: Formulationmentioning

confidence: 99%

Current-Phase Relation in FSIFS Josephson Junction

Emamipour

Khatibi

2014

J Supercond Nov Magn

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In the framework of Tsukada-Furusaki formula, we calculate dc josephson current at a ferromagnetic superconductor-insulator-ferromagnetic superconductor (FSIFS) junction as function of phase difference between two ferromagnetic superconductors (FSs). We consider identical FSs which are in three different Cooper pairing states: one singlet S wave pairing and two triplet with parallel and anti parallel spins. We find a sinusoidal form for strong barrier strength for above-mentioned. Cooper pairing states while we find a deviation from sinusoidal form for weak barrier strength. Different behaviors of I (φ) in terms of FS exchange field can help us distinguish the type of Cooper pairing state at the FSs which is still a controversial issue in low-temperature physics.

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“…Josephson junctions with spin-split superconductors have been also studied in various types of structures. In ZS/N/ZS junctions, the spin degeneracy of the Andreev level is lifted and the magnitude of the spin splitting can be controlled by changing either the magnitude or relative direction of the Zeeman field in the superconducting leads [16][17][18][19]. ZS/N/ZS junctions with unconventional superconducting pairing, such as p-or d-wave pairing, have also been studied, and the tunability of the Andreev level by changing the relative direction of the Zeeman field and superconducting d vector has been demonstrated [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Tunability of Andreev levels via spin-orbit coupling in Zeeman-split Josephson junctions

et al. 2017

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We study Andreev reflection and Andreev levels ε in Zeeman-split superconductor/Rashba wire/Zeeman split superconductor junctions by solving the Bogoliubov-de Gennes equation. We theoretically demonstrate that the Andreev levels ε can be controlled by tuning either the strength of Rashba spin-orbit interaction or the relative direction of the Rashba spin-orbit interaction and the Zeeman field. In particular, it is found that the magnitude of the band splitting is tunable by the strength of the Rashba spin-orbit interaction and the length of the wire, which can be interpreted by a spin precession in the Rashba wire. We also find that if the Zeeman field in the superconductor has the component parallel to the direction of the junction, the ε-φ curve becomes asymmetric with respect to the superconducting phase difference φ. Whereas the Andreev reflection processes associated with each pseudospin band are sensitive to the relative orientation of the spin-orbit field and the exchange field, the total electric conductance interestingly remains invariant.

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Josephson current in ferromagnet-superconductor tunnel junctions

Cited by 36 publications

References 16 publications

Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures

Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures

Current-Phase Relation in FSIFS Josephson Junction

Tunability of Andreev levels via spin-orbit coupling in Zeeman-split Josephson junctions

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