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## Reconstruction of the DOS at the End of a S/F Bilayer

JETP Letters. 2019. Vol. 109. No. 1. P. 61-62.

Bobkova I.V., Bobkov A. M.

Influence of a nonmagnetic surface on the density of states in a spin-split superconductor, which is realized on the basis of a S/F bilayer, is investigated. It is demonstrated that if the ferromagnet magnetization has a defect in the form of a domain wall in the vicinity of the surface, the superconducting density of states is reconstructed manifesting the spin-split Andreev resonances. Formation of these resonances is not connected to any superconducting order parameter inhomogeneities. Andreev reflection processes forming the resonances occur at the inhomogeneity of the spin-split gap generated by the domain wall. These resonances can be used as a spectroscopic probe of a domain wall presence and motion.

Golovchanskiy I. A., Abramov N. N., Vlasenko V. A. et al., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 106 No. 2 Article 024412

In this paper, we report the results of magnetic resonance spectroscopy of EuFe2As2 single crystals. We
observe magnetic resonance responses, which are attributed to antiferromagnetic resonances of the Eu sublattice
with orthorhombic crystal structure and with different orientations of twin domains relative to the external field.
We confirm the validity of the recently proposed spin Hamiltonian with anisotropic ...

Added: November 16, 2022

Красавин А. В., Review of Scientific Instruments 2018 Vol. 89 Article 033907

A technique is presented of restoring the electronic density of states of the valence band from data of X-ray photoelectron spectroscopy (XPS). The originality of the technique consists in using a stochastic procedure to solve an integral equation relating the density of states and the experimental X-ray photoelectron spectra via the broadening function. To obtain ...

Added: July 18, 2023

Malov V. V., Tameev A. R., Novikov S. V. et al., Organic Photonics and Photovoltaics 2015 Vol. 3 No. 1 P. 156-160

Optical and photoelectric properties of modern photosensitive polymers are of great interest due to their prospects for photovoltaic applications. In particular, an investigation of absorption and photoconductivity edge of these materials could provide valuable information. For these purpose we applied the constant photocurrent method which has proved its efficiency for inorganic materials. PCDTBT and PTB7 ...

Added: November 20, 2015

Golovchanskiy I., Abramov N. N., Stolyarov V. S. et al., Advanced Science 2019 Vol. 6 No. 16 P. 1900435-1-1900435-8

In this work, a class of metamaterials is proposed on the basis of ferromagnet/superconductor hybridization for applications in magnonics. These metamaterials comprise of a ferromagnetic magnon medium that is coupled inductively to a superconducting periodic microstructure. Spectroscopy of magnetization dynamics in such hybrid evidences formation of areas in the medium with alternating dispersions for spin ...

Added: October 31, 2019

Azarevich A., Bogach A., Glushkov V. et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 103 No. 10 Article 104515

We have studied the normal and superconductive state characteristics (resistivity, Hall coefficient, heat capacity, and magnetization) of model strongly correlated electronic systems LuxZr1−xB12 with cooperative Jahn-Teller instability of the boron rigid cage and with dynamic charge stripes. It was found that these metals are s-wave dirty limit superconductors with a small mean free path of charge carriers l=5–140Å and with ...

Added: October 25, 2022

Seleznyov Dmitry, Yagovtsev V., Pugach N. et al., Journal of Magnetism and Magnetic Materials 2024 Vol. 595 Article 171645

A ferromagnetic insulator proximate with a superconductor induces some spin asymmetry in superconducting correlations. Density of states (DoS) changes as a result of the induction of magnetization in superconductor (S) under the influence of the inverse proximity effect with the ferromagnetic insulator (FI). The study solves the Usadel equations numerically and calculates characteristic features of ...

Added: March 14, 2024

Vasenko A. S., Kawabata S., Golubov A. A. et al., Physica C: Superconductivity and its Applications 2010 Vol. 470 No. 19 P. 863-866

We investigate superconductor/insulator/ferromagnet/superconductor (SIFS) tunnel Josephson junctions in the dirty limit, using the quasiclassical theory. We consider the case of a strong tunnel barrier such that the left S layer and the right FS bilayer are decoupled. We calculate quantitatively the density of states (DOS) in the FS bilayer for arbitrary length of the ferromagnetic ...

Added: November 29, 2017

Norman G., Saitov I., Doklady Physics 2019 Vol. 64 No. 4 P. 145-149

—The structural transformation of solid hydrogen under compression along the isotherm of 100 K in
the region of transition into the conductive state was studied within the density functional theory. The pressure, the pair correlation function of protons, the density of electron states, and the electrical conductivity were calculated within a range of hydrogen densities from ...

Added: October 30, 2019

Feigelman M., Ioffe L., Physical Review Letters 2018 Vol. 120 P. 037004-1-037004-6

Strongly disordered pseudogapped superconductors are expected to display arbitrarily high values of kinetic inductance close to the superconductor-insulator transition (SIT), which make them attractive for the implementation of large dissipationless inductance. We develop the theory of the collective modes in these superconductors and discuss associated dissipation at microwave frequencies. We obtain the collective mode spectra ...

Added: October 27, 2018

A.G. Mal'shukov, Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 P. 054504-1-054504-7

The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction of magnetic impurities in a superconductor exponentially decreases when the distance between them is larger than the superconductor's coherence length, because this interaction is mediated by quasiparticles, which have a gap in their energy spectrum. At the same time, the spin-singlet superconducting condensate was always assumed to stay neutral to magnetic ...

Added: February 6, 2019

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

Kuntsevich A., Миньков Г. М., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 No. 19

The phase of quantum magneto-oscillations is often associated with the Berry phase and is widely used to argue in favor of topological nontriviality of the system (Berry phase 2πn+π). Nevertheless, the experimentally determined value may deviate from 2πn+π arbitrarily, therefore more care should be made analyzing the phase of magneto-oscillations to distinguish trivial systems from nontrivial. In this ...

Added: June 17, 2022

A.G. Mal'shukov, Espedal C., Lange P. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 95 P. 054509(1)-054509(17)

We consider the spin-orbit-induced spin Hall effect and spin swapping in diffusive superconductors.
By employing the non-equilibrium Keldysh Green’s function technique in the quasiclassical
approximation, we derive coupled transport equations for the spectral spin and particle distributions
and for the energy density in the elastic scattering regime. We compute four contributions to
the spin Hall conductivity, namely, skew scattering, ...

Added: February 6, 2019

Sasaki A., Ikegaya S., Habe T. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 101 No. 184501 P. 184501-1-184501-6

We study theoretically the Josephson effect between two two-band superconductors respecting time-reversal
symmetry, where we assume a spin-singlet s-wave pair potential in each conduction band. The superconducting
phase at the first band ϕ1 and that at the second band ϕ2 characterize a two-band superconducting state. We
consider a Josephson junction where an insulating barrier separates two such two-band ...

Added: October 8, 2020

Bosboom V., Van der Vegt J. J., Kupriyanov M. Y. et al., Superconductor Science and Technology 2022 Vol. 34 No. 11 Article 115022

We develop a quantitative model describing the distribution of the supercurrent density and
density of states in SN-N-NS type Josephson junctions in three dimensions (S is a
superconductor and N is a normal metal). The model is based on the self-consistent solution of
the quasiclassical Usadel equations using the finite element method. We investigate the
influence of the proximity ...

Added: October 31, 2022

Vilkov E., Byshevski-Konopko O., Stremoukhov P. A. et al., Ultrasonics 2022 Vol. 119 Article 106588

Dynamic interaction of acoustic and magnetic systems is of strong current interest, triggered by the promises of almost lossless new concepts of magnet-based information technology. In such concepts, a significant role is often given to domain walls (DW). Therefore, here we investigate how launching an acoustic shear wave, we can control the DW motion. Surprisingly, at sufficiently large ...

Added: October 26, 2021

Vasenko A. S., Kawabata S., Golubov A. A. et al., Physical Review B: Condensed Matter and Materials Physics 2011 Vol. 84 No. 2 P. 024524-1-024524-11

We present a quantitative study of the current-voltage characteristics (CVC) of diffusive superconductor/insulator/ferromagnet/superconductor (SIFS) tunnel Josephson junctions. In order to obtain the CVC we calculate the density of states (DOS) in the F/S bilayer for arbitrary length of the ferromagnetic layer, using quasiclassical theory. For a ferromagnetic layer thickness larger than the characteristic penetration depth ...

Added: November 29, 2017

Barash L., Marshall J., Weigel M. et al., / Cornell University. Series cond-mat "arxiv.org". 2018. No. 1808.04340.

Estimating the density of states of systems with rugged free energy landscapes is a notoriously difficult task of the utmost importance in many areas of physics ranging from spin glasses to biopolymers to quantum computing. Some of the standard approaches suffer from a spurious convergence of the estimates to metastable minima, and these cases are ...

Added: October 17, 2018

Korneeva Y., Manova N. N., Dryazgov M. et al., Superconductor Science and Technology 2021 Vol. 34 No. 8 Article 084001

We report our study of detection efficiency (DE) saturation in wavelength range 400–1550 nm for the NbN superconducting microstrip single-photon detectors (SMSPDs) featuring the strip width up to 3 µm. We observe an expected decrease of the DE saturation plateau with the increase of photon wavelength and decrease of film sheet resistance. At 1.7 K temperature ...

Added: September 20, 2021

Nashaat M., Bobkova I.V., Bobkov A. M. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 5 P. 054506-1-054506-7

Strong dependence of the Josephson energy on the magnetization orientation in Josephson junctions with ferromagnetic interlayers and spin-orbit coupling opens a way to control magnetization by Josephson current or Josephson phase. Here we investigate the perspectives of magnetization control in superconductor/ferromagnet/superconductor (S/F/S) Josephson junctions on the surface of a 3D topological insulator hosting Dirac quasiparticles. ...

Added: November 19, 2019

A.G. Mal'shukov, Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 95 P. 064517-1-064517-11

The spin-galvanic (inverse Edelstein) and inverse spin-Hall effects are calculated for a hybrid
system that combines thin superconductor and Rashba-metal layers. These effects are produced by
a nonequilibrium spin polarization which is injected into the normal metal layer. This polarization
gives rise to an electric potential that relaxes within some characteristic length, which is determined
by the Andreev reflection. ...

Added: February 6, 2019

Vasenko A. S., Golubov A. A., Kupriyanov M. Y. et al., Physical Review B: Condensed Matter and Materials Physics 2008 Vol. 77 No. 13 P. 134507-1-134507-9

We investigate superconductor/insulator/ferromagnet/superconductor tunnel Josephson junctions in the dirty limit using the quasiclassical theory. We formulate a quantitative model describing the oscillations of critical current as a function of thickness of the ferromagnetic layer and use this model to fit recent experimental data. We also calculate quantitatively the density of states (DOS) in this type ...

Added: November 29, 2017

Rabinovich D. S., Bobkova I.V., Bobkov A. M. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 No. 21 P. 214501-1-214501-12

We demonstrate that the hybrid structures consisting of a superconducting layer with an adjacent spin-textured ferromagnet demonstrate the variety of equilibrium magnetoelectric effects originating from coupling between the conduction electron spin and superconducting current. By deriving and solving the generalized Usadel equation, which takes into account the spin-filtering effect, we find that a supercurrent generates ...

Added: November 19, 2019

Gippius A. A., Gunbin A. V., Tkachev A. V. et al., Intermetallics 2023 Vol. 163 Article 108063

A comprehensive study of the intermetallic superconductor Mo8Ga41 was conducted by means of HRPXRD, abinitio calculations, NMR and NQR spectroscopy on 69Ga and 71Ga nuclei, as well as tunneling spectroscopy. All experimental methods used demonstrated the presence of an inherent surface superconducting phase in addition to the bulk superconducting phase. For the latter, the s-wave ...

Added: April 9, 2024