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## Эффект сверхпроводящего спинового клапана в структурах со слоями ферромагнитного сплава Гейслера

Physics of the Solid State. 2022. Т. 64. № 9. С. 1201-1210.

Mazanik A. A., Fominov Ya.V., Annals of Physics 2023 Vol. 449 Article 169199

We study the density of states (DoS) $\nu(E)$ in a normal-metallic (N) film contacted by a bulk superconductor (S). We assume that the system is diffusive and the SN interface is transparent. In the limit of thin N layer (compared to the coherence length), we analytically find three different types of the DoS peculiarity at ...

Added: December 27, 2022

T. Karabassov, A.A. Golubov, Silkin V. M. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 103 P. 224508-1-224508-9

Superconducting hybrid structures with topological order and induced magnetization offer a promising way to realize fault-tolerant quantum computation. However, the effect of the interplay between magnetization and the property of the topological insulator surface, otherwise known as spin-momentum locking on the superconducting proximity effect, still remains to be investigated. We relied on the quasiclassical self-consistent ...

Added: June 4, 2021

Марычев П. М., Водолазов Д. Ю., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 105 No. 9 Article 094522

We theoretically predict that the critical current Ic and magnetization M of a hybrid superconductor/normal-metal (SN) strip may have nonmonotonous dependence on a perpendicular magnetic field—so-called peak effect. In contrast to familiar peak effect, which is connected either with vortex entry to the superconductor or with peculiarities of vortex pinning, the found phenomenon exists at ...

Added: January 13, 2023

Kamashev A. A., Garif’yanov N. N., Validov A. A. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 P. 134511-1-134511-11

This article represents a mini review of our obtained results about of superconducting spin-valve effect in heterostructures with ferromagnetic Heusler alloy layers.
We have analysed and compared the superconducting properties of the spin-valve structures containing the Heusler alloy Co$_2$Cr$_{1-x}$Fe$_x$Al$_{y}$ as one
of two ferromagnetic (F1 or F2) layers of the F1/F2/S structure, where S stands for the ...

Added: October 25, 2019

Golikova T. E., Wolf M. J., Beckmann D. et al., Superconductor Science and Technology 2021 Vol. 34 No. 9 Article 095001

A nonmonotonic dependence of the critical Josephson supercurrent on the injection current
through a normal metal/ferromagnet weak link from a single domain ferromagnetic strip has
been observed experimentally in nanofabricated planar crosslike S-N/F-S Josephson structures.
This behavior is explained by 0–π and π–0 transitions, which can be caused by the suppression
and Zeeman splitting of the induced superconductivity due ...

Added: June 7, 2021

Марычев П. М., Водолазов Д. Ю., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 No. 21 P. 214510

Temperature-induced transition of thin superconductor/ferromagnet/normal-metal (S/F/N) hybrid structure to an in-plane Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is accompanied by vanishing of effective inverse magnetic field penetration depth Λ−1. Here we show that Λ−1 goes to zero only in the limit of zero magnetic field H→0 and at any finite parallel H or in-plane current I it is ...

Added: January 10, 2023

Уставщиков С. С., Aladyshkin A. Y., Курин В. В. et al., Физика твердого тела 2019 Т. 61 С. 1722-1728

Теоретически и экспериментально исследована температурная зависимость линейного электродинамического отклика тонкопленочных гибридных структур сверхпроводник (MoN) — нормальный металл (Al) с большой разностью проводимостей в нормальном состоянии. Низкочастотные измерения коэффициента взаимной индукции двух катушек с помещенным между ними образцом свидетельствуют об увеличении магнитной экранировки структур сверхпроводник–нормальный металл (SN) с ростом d_Al в области гелиевых температур, где d_Al ...

Added: September 15, 2022

Curran P., Kim J., Satchell N. et al., Applied Physics Letters 2015 Vol. 107 P. 262602-262602

We demonstrate that the magnetic state of a superconducting spin valve, that is normally controlled with an external magnetic field, can also be manipulated by varying the temperature which increases the functionality and flexibility of such structures as switching elements. In this case, switching is driven by changes in the magnetostatic energy due to spontaneous ...

Added: February 22, 2017

T. Karabassov, A. V. Guravova, Kuzin A. Y. et al., Beilstein Journal of Nanotechnology 2020 Vol. 11 P. 252-262

We present a quantitative study of the current-voltage characteristics (CVC) of SFIFS Josephson junctions (S denotes bulk superconductor, F - metallic ferromagnet, I - insulating barrier) with weak ferromagnetic interlayers in the diffusive limit. The problem is solved in the framework of the nonlinear Usadel equations. We consider the case of a strong tunnel barrier ...

Added: November 8, 2019

Селезнев Д. В., Yagovtsev V., Pugach N. et al., Физика металлов и металловедение 2022

Наведенная за счет обратного эффекта близости намагниченность в сверхпроводнике исследуется в гибридных структурах, содержащих сверхпроводник и ферромагнитный изолятор. Исследование проводится в рамках метода квазиклассических функций Грина, в котором уравнения Узаделя численно решаются с граничными условиями, подходящими для сильно спин-поляризованных ферромагнитных материалов. Изучалась конверсия синглетных сверхпроводящих корреляций в триплетные в результате эффекта близости с ферромагнетиком и ...

Added: November 17, 2022

Stroganov P. L., Ya. V. Fominov, Cooper pair splitting in ballistic ferromagnetic SQUIDs / Cornell University. Series cond-mat "arxiv.org". 2017. No. arXiv:1708.05089.

We consider ballistic SQUIDs with spin filtering inside half-metallic ferromagnetic arms. A singlet Cooper pair cannot pass through an arm in this case, so the Josephson current is entirely due to the Cooper pair splitting, with two electrons going to different interferometer arms. In order to elucidate the mechanisms of Josephson transport due to split ...

Added: October 18, 2017

Andrew G. Semenov, Zaikin A., Kuzmin L., Physical Review B: Condensed Matter and Materials Physics 2012 Vol. 86 No. 14 P. 144529-1-144529-5

We argue that electron-electron interactions fundamentally restrict the penetration length of Cooper pairs into a diffusive normal metal from a superconductor. At low temperatures, this Cooper pair dephasing length remains finite and does not diverge. We evaluate the subgap conductance of hybrids in the presence of electron-electron interactions and demonstrate that this length Lϕ can ...

Added: February 9, 2015

Stepanov N., Skvortsov M. A., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 No. 14 P. 144517-1-144517-16

We study the effect of superconducting fluctuations on the conductivity of metals at arbitrary temperatures T and impurity scattering rates τ−1. Using the standard diagrammatic technique but in the Keldysh representation, we derive the general expression for the fluctuation correction to the dc conductivity applicable for any space dimensionality and analyze it in the case of the film ...

Added: June 6, 2018

Семенов А. В., Девятов И. А., Smirnov K. et al., Журнал радиоэлектроники 2011 № 11

We investigate contribution to the detectivity of superconducting radiation sensors, originated from a change in spectral functions of the absorber under influence of the absorbed power. For the absorber manufactured of dirty superconducting film we demonstrate that at low temperature the only cause of the change in spectral functions is the change of the order ...

Added: October 12, 2017

Kagan M.Yu., Springer, 2013

Overview This book concisely presents the latest trends in the physics of superconductivity and superfluidity and magnetismin novel systems, as well as the problem of BCS-BEC crossover in ultracold quantum gases and high-Tc superconductors. It further illuminates the intensive exchange of ideas between these closely related fields of condensed matter physics over the last 30 ...

Added: February 17, 2014

Marques C. A., Neat M. J., Yim C. M. et al., New Journal of Physics 2020 Vol. 22 No. June Article 063049

In a superconductor that lacks inversion symmetry, the spatial part of the Cooper pair wave function has a reduced symmetry, allowing for the mixing of spin-singlet and spin-triplet Cooper pairing channels and thus providing a pathway to a non-trivial superconducting state. Materials with a non-centrosymmetric crystal structure and with strong spin–orbit coupling are a platform ...

Added: October 11, 2020

Vasenko A.S., Kawabata S., Ozaeta A. et al., Journal of Magnetism and Magnetic Materials 2015 Vol. 383 P. 175-179

Ferromagnetic materials with exchange fields E_ex smaller or of the order of the superconducting gap Delta are important for applications of corresponding (s-wave) superconductor/ ferromagnet/ superconductor (SFS) junctions. Presently such materials are not known but there are several proposals how to create them. Small exchange fields are in principle difficult to detect. Based on our ...

Added: September 28, 2015

Andrew G. Semenov, Zaikin A., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 91 No. 2 P. 024505-1-024505-10

We demonstrate that in sufficiently long diffusive superconducting-normal-superconducting (SNS) junctions dc Josephson current is exponentially suppressed by electron-electron interactions down to zero temperature. This suppression is caused by the effect of Cooper pair dephasing which occurs in the normal metal and defines a new fundamental length scale Lφ in the problem. This length is fully consistent with that derived ...

Added: March 11, 2015

Andrew G. Semenov, Zaikin A., Physical Review B: Condensed Matter and Materials Physics 2013 Vol. 88 No. 5 P. 054505-1-054505-10

We investigate the effect of interacting quantum phase slips on persistent current and its fluctuations in ultrathin superconducting nanowires and nanorings pierced by the external magnetic flux. We derive the effective action for these systems and map the original problem onto an effective sine-Gordon theory on torus. We evaluate both the flux dependent persistent current ...

Added: February 9, 2015

Barabanenkov M. Y., Kalyabin D., Nikitov S., Journal of Experimental and Theoretical Physics 2020 Vol. 130 No. 4 P. 549-554

Simultaneous quantum correlations between two spins in magnetic nanostructures are considered in the model of a linear chain of a finite number of atoms with exchange interaction between electron spins of neighboring atoms in the framework of the Heisenberg ferromagnetism theory. We assume that in the initial state, the spins of all chain atoms except the first ...

Added: October 26, 2021

Karabassov T., Vasenko A., Известия Уфимского научного центра РАН 2021 Т. 1 С. 10-16

Materials that possess strong spin-orbit interaction have provoked great interest over the past few years, in
particular, in the actively developing field of quantum calculations. A topological insulator is a good example of
such a material. The topological insulator has high surface conductivity, whereas in the body it shows the properties
of an insulator, this being a purely ...

Added: December 30, 2020

Brems X., Muhlbauer S., Córdoba C. W. et al., Superconductor Science and Technology 2022 Vol. 35 No. 3 Article 035003

Small-angle neutron scattering is used in combination with transport measurements to
investigate the current-induced effects on the morphology of the intermediate mixed state (IMS)
domains in the intertype superconductor niobium. We report the robust self-organisation of the
vortex lattice domains to elongated parallel stripes perpendicular to the applied current in a
steady-state. The experimental results for the formation of ...

Added: January 30, 2022

Palnichenko A. V., Mazilkin A. A., Rybchenko O. et al., Physica C: Superconductivity and its Applications 2020 Vol. 571 Article 1353608

Metastable superconducting-like behavior of rhombohedral Bi samples exposed to surface oxidation under special conditions has been observed below the critical temperature range of 15–35 K. The ac magnetic susceptibility and electrical resistance measurements imply that the superconductivity appears in the Bi/Bi2O3 interfacial layer formed at the surface of the samples. ...

Added: October 26, 2022

Arutyunov K., Lehtinen J., Physical Review Letters 2022 Vol. 128 Article 159702

Comment LEK1147 on ``Coulomb blockade and Bloch oscillations in superconducting Ti
nanowires'' by E. V. Il'ichev, V. V. Ryazanov, and O. V. Astafiev ...

Added: November 24, 2022