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## Подавление минищели в S(N/F)S контактах

Письма в Журнал экспериментальной и теоретической физики. 2021. Т. 113. № 10. С. 661-668.

П.А.Иоселевич, Чукланов Д. А.

Translator: Ioselevich P.

Keywords: mesoscopic superconductivityмезоскопическая сверхпроводимостьMagnetic Josephson junctionsмагнитные джозефсоновские контакты

Publication based on the results of:

Ioselevich P., Chuklanov D. A., JETP Letters 2021 Vol. 113 P. 631-637

We consider a long diffusive Josephson junction where the weak link is a thin (normal metal (N)–ferromagnet (F)) bilayer (N and F form parallel links between superconductors (Ss)). We show that superconductivity in the weak link can be described by an effective one-dimensional Usadel equation containing a “diluted” exchange field as well as a weak ...

Added: October 25, 2021

Shapiro D., Mirlin A., Shnirman A., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 3 Article 035434

We consider an interferometer based on artificially induced topological superconductivity and chiral one-dimensional (1D) Majorana fermions. The (nontopological) superconducting island inducing the superconducting correlations in the topological substrate is assumed to be floating. This allows probing the physics of interfering Majorana modes via microwave response, i.e., the frequency-dependent impedance between the island and the earth. ...

Added: October 31, 2021

Андрияхина Е. С., Burmistrov I., Журнал экспериментальной и теоретической физики 2022 Т. 162 № 4 С. 522-540

The interplay of Anderson localization and electron-electron interactions is known to lead to enhancement of superconductivity due to multifractality of electron wave functions. We develop the theory of multifractally-enhanced superconducting states in two-dimensional systems in the presence of spin-orbit coupling. Using the Finkel'stein nonlinear sigma model, we derive the modified Usadel and gap equations that ...

Added: November 13, 2022

P. A. Ioselevich, Ostrovsky P. M., Ya. V. Fominov et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 95 No. 9 P. 094508-1-094508-6

We study Josephson junctions with weak links consisting of two parallel disordered arms with magnetic
properties: ferromagnetic, half-metallic, or normal with magnetic impurities. In the case of long links, the
Josephson effect is dominated by mesoscopic fluctuations. In this regime, the system realizes a phi_0 junction with
sample-specific phi_0 and critical current. Cooper pair splitting between the two ...

Added: October 18, 2017

Ryazanov V.V., Caruso R., Massarotti D. et al., Journal of Applied Physics 2018 Vol. 123 No. 13 P. 133901-6

We test the effect of an external RF field on the switching processes of magnetic Josephson junctions (MJJs) suitable for the realization of fast, scalable cryogenic memories compatible with Single Flux Quantum logic. We show that the combined application of microwaves and magnetic field pulses can improve the performances of the device, increasing the separation ...

Added: March 2, 2019

M. : Faculty of Physics, MSU, 2017

The Low Temperature Physics Conference is an international event held every three years, under the auspices of the IUPAP through its Commission C5 on Low Temperature Physics. The aim of these conferences is to exchange information and views among the members of the international scientific community in the general field of Low Temperature Physics. It ...

Added: October 1, 2017

Arutyunov K., Lehtinen J. S., Beilstein Journal of Nanotechnology 2020 Vol. 11 P. 417-420

Chain of superconductor-insulator-superconductor junctions based on Al-AlOx-Al... lift-off fabricated nanostructures was measured at ultra-low temperatures. At zero magnetic field the low current bias dynamic resistance can reach values ~1011 W. The system has been proved to provide a decent quality current biasing circuit enabling observation of Coulomb blockade and Bloch oscillations in ultra-narrow Ti nanowires ...

Added: September 18, 2020

Bubis A. V., E. V. Shpagina, Nasibulin A. G. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 12 Article 125409

We investigate diffusive nanowire-based structures with two normal terminals on the sides and a central
superconducting island in the middle, which is either grounded or floating. Using a semiclassical calculation
we demonstrate that both device layouts permit a quantitative measurement of the energy dependent subgap
thermal conductance Gth from the spectral density of the current noise. In the ...

Added: April 3, 2023

Stroganov P. L., Ya. V. Fominov, / 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

Stroganov P. L., Ya.V. Fominov, Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 17 P. 174508-1-174508-13

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 Cooper pairs, we ...

Added: November 17, 2017

Pugach N., Heim D., Seleznev D. V. et al., Superconductor Science and Technology 2022 Vol. 35 Article 025002

We propose a superconducting spin valve based on a Josephson junction with B20-family
magnetic metal as a barrier material. Our analysis shows that the states of this element can be
switched by reorienting the intrinsic non-collinear magnetization of the spiral magnet. This
reorientation modifies long-range spin-triplet correlations and thereby strongly influences the
critical Josephson current. Compared to superconducting spin ...

Added: March 26, 2022

Arutyunov K., Lehtinen J. S., Radkevich A. A. et al., Journal of Magnetism and Magnetic Materials 2018 Vol. 459 P. 356-358

Quasi-one-dimensional superconducting channels host sound-like plasma modes propagating along the
which are associated with fluctuations of the phase of the superconducting order parameter (Mooiji and
1985) [5]. Interaction between these electromagnetic excitations and charge carriers affects the electron density
of states (DOS). I-V characteristics of tunnel S1-I-S2 junctions, where superconducting S2 electrode
nanowire in the regime of quantum fluctuations ...

Added: October 1, 2017

Bobkov G. A., I.V. Bobkova, Bobkov A. M., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 105 No. 2 Article 024513

A mechanism of a superconductivity-mediated interaction of two magnets in a system of coupled superconductor-ferromagnet-superconductor (S-F-S) Josephson junctions (JJs) with spin-orbit interaction is proposed. The predicted indirect magnetic interaction favors the antiparallel orientation of the magnets. Its spatial scale is not restricted by the proximity length scales of the superconductor. Our estimates suggest that the ...

Added: October 27, 2022

Denisov A., Bubis A., Piatrusha S. et al., Nanomaterials 2022 Vol. 12 No. 9 Article 1461

Mesoscopic superconductivity deals with various quasiparticle excitation modes, only one of them—the charge-mode—being directly accessible for conductance measurements due to the imbalance in populations of quasi-electron and quasihole excitation branches. Other modes carrying heat or even spin, valley etc. currents populate the branches equally and are charge-neutral, which makes them much harder to control. This ...

Added: April 3, 2023

Arutyunov K., M. : Lebedev Institute, 2017

Superconducting properties of metallic nanowires can be entirely different from those of bulk superconductors because of the dominating role played by thermal and quantum fluctuations of the order parameter. For superconducting channels with diameters below ∼ 50 nm fluctuations of the phase of the complex order parameter - the phase slippage - lead to non-zero ...

Added: October 1, 2017

Averin D. V., Wang G., A.S. Vasenko, Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 No. 14 P. 144516-1-144516-6

We extend the basic theory of Andreev reflection (AR) in a normal metal/superconductor junction to the situation with an arbitrary time-dependent bias voltage V(t) across the junction. The central element of the theory is the fact that the Fourier transform of the AR amplitude has a casual structure. As an example, the theory is used to describe ...

Added: October 13, 2020

Shein K., Zarudneva A., Emel’yanova V. et al., Physics of the Solid State 2020 Vol. 62 No. 9 P. 1539-1542

The transport properties of two types of quasi-one-dimensional superconducting microstructures were investigated at ultra-low temperatures: the narrow channels close-packed in the shape of meander, and the chains of tunneling contacts "superconductor-insulator-superconductor." Both types of the microstructures demonstrated high value of high-frequency impedance and-or the dynamic resistance. The study opens up potential for using of such ...

Added: September 18, 2020

Temu E., Lahteenmaki P., Golubev D. et al., Journal of Low Temperature Physics 2017 Vol. 189 P. 204-216

We have employed noise thermometry for investigations of thermal relaxation
between the electrons and the substrate in nanowires patterned from 40-nm-thick
titanium film on top of silicon wafers covered by a native oxide. By controlling the
electronic temperature Te by Joule heating at the base temperature of a dilution refrigerator,
we probe the electron–phonon coupling and the thermal boundary ...

Added: December 5, 2017

Mazanik A. A., I.V. Bobkova, Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 105 No. 141 Article 144502

We predict that long-range triplet correlations (LRTC) in superconductor/ferromagnet (S/F) hybrids with extrinsic impurity spin-orbit coupling can be generated and manipulated by supercurrent flowing in the superconducting leads along the S/F interfaces. The LRTC appear via two basic mechanisms. The essence of the first one is the generation of triplets by the superconducting spin Hall ...

Added: October 27, 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

Arutyunov K., Lehtinen J. S., В кн. : "Нанофизика и наноэлектроника" Труды XXI Международного симпозиума. : Н. Новгород : Издательство Нижегородского государственного университета им. Н.И. Лобачевского, 2017. С. 23-24.

Экспериментально исследовались вольт-амперные характеристики туннельных контактов сверхпроводник – изолятор – сверхпроводник (С1-И-С2), где сверхпроводящий электрод С2 представлял из себя тонкий нанопровод. Обнаруженное размытие щелевых особенностей интерпретируется как проявление эффекта квантовых флуктуаций модуля параметра порядка. Практическим результатом работы является установление границ применимости в наноэлектронных устройствах сверхпроводящих элементов сверхмалых размеров. ...

Added: October 1, 2017

K. Yu. Arutyunov, Lehtinen J. S., Radkevich A. A. et al., Physics of the Solid State 2017 Vol. 59 No. 11 P. 2110-2113

The current–voltage characteristics of superconductor–insulator–semiconductor (S1–I–S2)
tunnel junctions, where superconducting electrode S2 is a thin nanowire, are studied experimentally. The
observed blurring of the gap singularities is interpreted as a manifestation of the order parameter quantum
fluctuations. We propose a model taking into account the broadening of the density of states due to the interaction
of electrons with the ...

Added: November 29, 2017

Arutyunov K., Lehtinen J. S., Радкевич А. А. et al., Физика твердого тела 2017 Т. 59 № 11 С. 2092-2094

The current–voltage characteristics of superconductor–insulator–semiconductor (S1–I–S2)
tunnel junctions, where superconducting electrode S2 is a thin nanowire, are studied experimentally. The
observed blurring of the gap singularities is interpreted as a manifestation of the order parameter quantum
fluctuations. We propose a model taking into account the broadening of the density of states due to the interaction
of electrons with the ...

Added: October 1, 2017

Stosiek M., Evers F., Burmistrov I., Physical Review Research 2021 Vol. 3 Article L042016

Mesoscopic fluctuations of the local density of states encode multifractal correlations in disordered electron systems. We study fluctuations of the local density of states in a superconducting state of weakly disordered films. We perform numerical computations in the framework of the disordered attractive Hubbard model on two-dimensional square lattices. Our numerical results are explained by ...

Added: November 14, 2021