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ИНЖЕКТИРОВАНИЕ СПИНОВОГО СВЕРХПРОВОДЯЩЕГО ТОКА ПУТЕМ ПРЕЦЕССИИ НАМАГНИЧЕННОСТИ
С. 56–63.
Publication based on the results of:
Polkin A., Skvortsov M., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 113 No. 17 Article 174516
We develop a full microscopic theory for the optical conductivity 𝜎(𝜔) of a dirty current-carrying superconductor. Within the Keldysh sigma model formalism, we obtain the general analytical expression for 𝜎(𝜔), applicable for arbitrary frequency 𝜔, temperature 𝑇, and dc supercurrent 𝐼. In addition to altering the usual Mattis-Bardeen conductivity 𝜎1(𝜔), a finite supercurrent introduces two new contributions: 𝜎qp2(𝜔) from quasiparticle redistribution and 𝜎SH2(𝜔) from the amplitude ...
Added: June 25, 2026
Skvortsov M., Artem V. Polkin, Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 113 No. 10 Article L100502
A dissipationless supercurrent state in superconductors can be destroyed by thermal fluctuations. Thermally activated phase slips provide a finite resistance of the sample and are responsible for dark counts in superconducting single-photon detectors. The activation barrier for a phase slip is determined by a space-dependent saddle-point (instanton) configuration of the order parameter. In the one-dimensional ...
Added: June 25, 2026
Lukmanova R.M., Cohn I.A., Minakova V. E. et al., Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 111 No. 22 Article 224510
The magnetoresistance of superconductor–topological insulator–superconductor structures, with indium as the superconductor and TaSe3 as the topological insulator, shows steplike features on the resistance under magnetic fields. These resistance steps result from the suppression of superconductivity, induced by the superconducting proximity effect in both the bulk and surface states of the topological insulator. The position and ...
Added: March 11, 2026
Korneeva Y. P., Dryazgov M. A., Trofimov I. V. et al., Superconductor Science and Technology 2025 Vol. 38 No. 7 Article 075016
This work demonstrates that depositing a thin layer of Mo (5–15 nm) onto a 10 nm thick NbN strip leads to a significant increase in the nonlinearity of the kinetic inductance . Specifically, the change in with increasing current reached 70% in the NbN/Mo bilayer at liquid helium temperature, whereas in the NbN strip, changed by only 10% ...
Added: March 1, 2026
Hybrid collective excitations in topological superconductor/ferromagnetic insulator heterostructures
T. Karabassov, I. V. Bobkova, Bobkov A. M. et al., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 113 No. 10 Article 104514
We develop a linear response theory for the dynamical proximity effect in topological superconductor/ferromagnetic insulator (TS/FI) hybrids. Our approach integrates the nonequilibrium quasiclassical Keldysh-Usadel formalism for the TS with the Landau-Lifshitz-Gilbert equation for the FI's magnetization dynamics. This framework reveals a proximity-induced coupling between magnons and superconducting collective modes. Crucially, we find that spin-momentum locking in ...
Added: February 26, 2026
Vyacheslav D. Neverov, Karabassov T., Andrey V. Krasavin et al., Research 2026 Vol. 9 Article 1087
Majorana zero modes (MZMs) localized in vortex cores of topological superconductors are widely regarded promising building blocks for fault-tolerant quantum computation. However, their unambiguous detection is hindered by the extremely small energy spacing separating them from conventional Caroli-de Gennes-Matricon states. Using a microscopic Bogoliubov-de Gennes approach, we demonstrate that nonmagnetic impurities, rather than suppressing, can ...
Added: February 17, 2026
Zabolotnykh A., Zagorodnev I., Kalyabin D. et al., Письма в Журнал экспериментальной и теоретической физики 2026 Т. 123 № 4 С. 293–299
Теоретически изучен микроволновый отклик двумерной (2D) электронной системы, расположенной на диэлектрической ферромагнитной пленке, которая, в свою очередь, лежит на проводящем металле (затворе), при этом вся система помещена во внешнее постоянное магнитное поле. Найдено, что ферромагнитный резонанс пленки и циклотронный резонанс электронов 2D системы в магнитном поле взаимодействуют, что приводит к их расталкиванию (“антикроссингу”). Обнаружено, что в области антикроссинга происходит ...
Added: February 5, 2026
Мещеряков А. А., Сафин А. Р., Kalyabin D. et al., Радиотехника и электроника 2025 Т. 70 № 12 С. 1190–1199
Теоретически исследовано взаимодействие резонансных мод в обменно-связанной двухслойной структуре скошенный антиферромагнетик/ферромагнетик. Методом гамильтонова формализма получены выражения, описывающие зависимость резонансных частот колебаний намагниченности от внешнего постоянного магнитного поля. Исследовано влияние связи между ферро- и антиферромагнитным слоями на ширину щели гибридизации и на величину внешнего магнитного поля, при котором наблюдается гибридизация между резонансной модой в ферромагнетике и нижней резонансной модой в антиферромагнетике. Показано, ...
Added: February 5, 2026
Stolyarov V. S., Kozlov S. N., Yakovlev D. S. et al., Communications Materials 2026 Vol. 7 Article 91
Superconducting proximity junctions based on topological insulators are widely believed to harbor Majorana-like bound states. If so, the static current phase relationship (CPR) should have a 4π-periodic component. It is then usually assumed that the static CPR can be extended to treat dynamic, voltage-biased, experiments and can justify the suppression of the first phase-lock-in microwave ...
Added: February 5, 2026
Kononova N., В кн.: XII Международная молодежная научная школа-конференция «Современные проблемы физики и технологий».: НИЯУ МИФИ, 2025. С. 167–169.
В работе исследованы термодинамические характеристики сверхпроводящего конденсата (вихревой материи), характерной для однозонных сверхпроводников в режиме перехода из первого рода во второй. На основе анализа изменения зависимости энергии Гиббса системы вихрей от внешнего магнитного поля сделаны выводы о характерных типах зависимости F(B) для такого перехода. Результаты демонстрируют, что для однозонных сверхпроводников в режиме межтиповой сверхпроводимости наблюдается ...
Added: February 2, 2026
A. A. Golubov, Bakurskiy S. V., T. Karabassov et al., JETP Letters 2026 Vol. 123 No. 5 P. 324–340
In this review, we summarize the foundations underlying a variety of phenomena in superconductor– ferromagnet hybrid structures, with a focus on recent advances in several key areas. These include: (i) the fundamental understanding of proximity effects in superconductor–ferromagnet based systems; (ii) spin-valve effects in superconductor– ferromagnet and superconductor–ferromagnet–superconductor Josephson junctions; and (iii) the design and ...
Added: January 25, 2026
Semenok D., Zhou D., Chen W. et al., Annalen der Physik 2025 Vol. 538 No. 1 Article e00467
We review five years of experimental and theoretical attempts (2020–2025) to enhance the superconducting critical temperature (Tc) of hydrogen-rich compounds by alloying binary superhydrides with additional elements. Despite predictions of higher Tc in ternary systems such as La–Y–H, La–Ce–H, and Ca–Mg–H, experiments consistently show that the maximum Tc in disordered ternary superhydrides does not exceed that of the ...
Added: January 24, 2026
Vyacheslav D. Neverov, Kalashnikov A., Andrey V. Krasavin et al., Beilstein Journal of Nanotechnology 2026 Vol. 17 P. 57–62
We present a comprehensive microscopic study of the intermediate mixed state in superconductors of the intertype (IT) regime separating types I and II. Using fully self-consistent Bogoliubov–de Gennes calculations for a lattice model, we analyze few-vortex configurations across the entire temperature range 0 < T < Tc. Our results demonstrate the key features of IT superconductivity, ...
Added: January 8, 2026
Tomayeva M., Vyacheslav D. Neverov, Andrey V. Krasavin et al., Beilstein Journal of Nanotechnology 2025 Vol. 16 P. 2265–2273
In the ballistic regime at finite temperatures, the proximity effect diminishes following an exponential pattern; however, at low or zero temperatures, this transition alters to a decay characterized by a power law with a dimensionality-dependent exponent. Here, we extend the current understanding of the proximity effect by exploring the role of normal metal–superconductor (NS) junction ...
Added: January 8, 2026
Ивашенцева И. В., Каурова Н. С., Воронов Б. М. et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2025 Vol. 18 No. 3.2 P. 129–133
This paper focuses on the study of reactive magnetron sputtering thin NbN films for sensitization of hot electron bolometers. HEB will be utilized in the Millimetron space observatory. The main principle of operation is a superconductivity that is experimentally observed when NbN film is cooled to the temperature of a liquid helium. At a critical ...
Added: December 24, 2025
Третьяков И. В., Каурова Н. С., Ивашенцева И. В. et al., Журнал технической физики 2025 Т. 94 № 7 С. 1102–1110
The influence of the magnetron deposition process parameters for a thin 4–5 nm NbN superconducting niobium nitride film and the NbN HEB mixer fabrication technology on the spread of their key parameters was experimentally studied to minimize this spread. In addition to optimizing the NbN film deposition process, uniformity of the NbN HEB mixer parameters ...
Added: December 23, 2025
Третьяков И. В., Худченко А. В., Рудаков К. И. et al., IEEE Transactions on Terahertz Science and Technology 2024 Vol. 15 No. 2 P. 191–199
The study of the origin and transport of water in the universe is an important part of the scientific program of the Millimetron space observatory. This will be made possible by observations conducted in single-dish mode using an onboard instrument—the high-resolution spectrometer (HRS). This instrument incorporates heterodyne array receivers operating within the range $0.5 -2.7$ ...
Added: December 23, 2025
Karabassov T., Bobkova I. V., Pavel M. Marychev et al., Beilstein Journal of Nanotechnology 2025 Vol. 17 P. 15–23
The diode effect in superconducting materials has been actively investigated in recent years. Plenty of different devices have been proposed as a platform to observe the superconducting diode effect. In this work, we discuss the possibility of a highly efficient superconducting diode design with controllable polarity. We propose a mesoscopic device that consists of two ...
Added: December 22, 2025
M. Yu. Kagan, A. V. Krasavin, R. Sh. Ikhsanov et al., Journal of Superconductivity and Novel Magnetism 2025 Vol. 38 Article 246
In the Review we discuss anomalous aspects of superconductivity (SC) and normal state, as well as formation of inhomogeneous (droplet-like or cluster-like) states in electron systems with attraction. We consider both the models with the retardation (Eliashberg mechanism of SC for strong electron-phonon interaction in metallic hydrogen) and without retardation (but with local onsite attraction). ...
Added: November 25, 2025
Semenov A. G., Latyshev A., Andrei D. Zaikin, Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 112 No. 14 Article 144501
We investigate the effects of fluxon cotunneling and quantum Coulomb drag in a system of two small
Josephson junctions coupled by means of mutual capacitanceCm. Depending on the value ofCm we identify three
different regimes of strong, intermediate, and weak coupling. Focusing our attention on the last two regimes we
develop a perturbation theory in the interaction and ...
Added: November 14, 2025