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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Gokhfel'd D. M., Shaikhutdinov K. A.
Заглавие : Andreev reflection in natural grain boundaries of polycrystalline high-T-c superconductor La1.85Sr0.15CuO4
Разночтения заглавия :авие SCOPUS: Andreev reflection in natural grain boundaries of polycrystalline high-Tc superconductor La1.85Sr0.15CuO 4
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 7. - P1219-1222. - ISSN 1063-7834, DOI 10.1134/1.1594233
Примечания : Cited References: 30
Предметные рубрики: CURRENT-VOLTAGE CHARACTERISTICS
WEAK LINKS
CHARGE-TRANSPORT
JUNCTIONS
CONDUCTIVITY
HYSTERESIS
COMPOSITES
SCATTERING
Аннотация: The temperature evolution of the current-voltage characteristic (CVC) of a "break junction" with metal-type conductivity on the polycrystalline La1.85Sr0.15CuO4 high-temperature superconductor is investigated. The CVC exhibits gap peculiarities and hysteresis, which is observed in the region of negative differential resistance. The experimental results are described well in terms of the Kummel-Gunsenheimer-Nicolsky theory for an S-N-S junction (S is a superconductor, N is a normal metal) this theory takes into account multiple Andreev reflection of quasiparticles. It is shown that the shape of the CVC and the existence and the shape of hysteresis are determined by the ratio of "long" and "short" grain boundaries in the polycrystal under investigation. (C) 2003 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nemtsev I. V., Tambasov I. A., Ivanenko A. A., Zyryanov V. Ya.
Заглавие : Angle-resolved reflection spectroscopy of high-quality PMMA opal crystal
Место публикации : Photonics Nanostruc. Fundam. Appl. - 2018. - Vol. 28. - P.37-44. - ISSN 15694410 (ISSN), DOI 10.1016/j.photonics.2017.11.007
Примечания : Cited References: 72. - This study was supported by the Russian Foundation for Basic Research (Grant No. 16-32-00302 мол_а ), by the Council for Grants of the President of the Russian Federation ( SP-317.2015.1 ), by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 16-42-243059 р_мол_а and No. 16-48-242092 р_офи_м, and by the Program of Foundation for Promotion of Small Enterprises in Science and Technology (No.6662ГУ2015) (“УМНИК” program). We acknowledge the support of Krasnoyarsk Regional Center for Collective Use of SB of RAS for equipment and technique. We thank A. V. Shabanov and O. V. Shabanova for assistance in dispersion preparation. We also thank V. G. Myagkov for useful discussion of the results.
Ключевые слова (''Своб.индексиров.''): pmma opal--photonic crystal--electron microscopy--angular resolved reflective spectroscopy
Аннотация: PMMA opal crystal was prepared by a simple hybrid method, which includes sedimentation, meniscus formation and evaporation. We investigated three surfaces of this crystal by angle-resolved reflective light spectroscopy and SEM study. The angle-resolved reflective measurements were carried out in the 400–1100 nm range. We have determined the high-quality ordered surface of the crystal region. Narrow particle size distribution of the surface has been revealed. The average particle diameter obtained with SEM was nearly 361 nm. The most interesting result was that reflectivity of the surface turned out up to 98% at normal light incidence. Using a fit of dependences of the maximum reflectivity wavelength from an angle based on the Bragg–Snell law, the wavelength of maximum 0° reflectivity, the particle diameter and the fill factor have been determined. For the best surface maximum reflectivity wavelength of a 0° angle was estimated to be 869 nm. The particle diameter and fill factor were calculated as 372 nm and 0.8715, respectively. The diameter obtained by fitting is in excellent agreement with the particle diameter obtained with SEM. The reflectivity maximum is assumed to increase significantly when increasing the fill factor. We believe that using our simple approach to manufacture PMMA opal crystals will significantly increase the fabrication of high-quality photonic crystal templates and thin films
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Gokhfeld D. M., Ospishchev S. V., Shaikhutdinov K. A., Aleksandrov K. S.
Заглавие : Applicability of the theory based on Andreev reflection to the description of experimental current-voltage characteristics of polycrystalline HTSC plus normal metal composites
Место публикации : Physica C. - 1999. - Vol. 314, Is. 1-2. - P.51-54. - ISSN 0921-4534, DOI 10.1016/S0921-4534(99)00151-3
Примечания : Cited References: 19
Предметные рубрики: WEAK LINKS
JUNCTIONS
FILMS
Ключевые слова (''Своб.индексиров.''): ybacuo + bapbo3 composites--network of weak s-n-s links--current-voltage characteristic
Аннотация: Measurements of current-voltage characteristics (CVC) of Y3/4Lu1/4Ba2,Cu3O7 + BaPbO3 and Y3/4Lu1/4Ba2Cu3O7 +BaPb0.9Sn0.1O3 composites modelling network of superconducting-normal metal-superconducting (S-N-S) junctions in effectively 'clean' and 'dirty' limits, respectively, have been performed. Essential difference of CVCs for these composites is observed in spite of the identical preparation technique and experimental conditions. It is shown that the theory for S-N-S junctions [R. Kummel, U. Gunsenheimer, R. Nicolsky, Phys. Rev. B, 42 (1990) 3932] well describes the experimental CVCs of the composites in both cases. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : Coherent manipulation of the Raman-induced gratings in atomic media
Коллективы : Russian Foundation for Basic Research [15-02-03959]
Место публикации : Phys. Rev. A: American Physical Society, 2016. - Vol. 93, Is. 1. - Ст.013810. - ISSN 1050-2947, DOI 10.1103/PhysRevA.93.013810. - ISSN 1094-1622(eISSN)
Примечания : Cited References:44. - This work was supported by the Russian Foundation for Basic Research through Grant No. 15-02-03959.
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
LIGHT
REFLECTION
OPTICS
Аннотация: We consider dynamically controllable periodic structures (gratings), resulting from Raman interaction of a weak probe field with a standing-wave pump and a second control laser field in four-level atomic media of N type. The gratings under study are induced due to periodic spatial modulation of the Raman gain in a standing pump field and fundamentally differ from the ones based on electromagnetically induced transparency. We show that spectral and transmission properties of these gratings can be controlled with the help of an additional weak field (control field) by varying its intensity or frequency. Small variations of the control field intensity can change the system from opaque to transparent and vice versa and this structure can operate as an all-optical transistor. Such a structure can also be used as a tunable nonlinear mirror with amplification.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : The Talbot effect under selective reflection from a Raman induced grating
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2022. - Vol. 15, Is. 6. - P.687-698. - ISSN 19971397 (ISSN), DOI 10.17516/1997-1397-2022-15-6-687-698; Журн. СФУ. Матем. и физика. - ISSN 23136022 (eISSN)
Примечания : Cited References: 33. - This work was partially (results for 1D gratings) supported by the Russian Science Foundation (RSF) through Grant 19-12-00203
Аннотация: In the present work, we study the Talbot effect under selective reflection of probe radiation at the interface between a dielectric and a layer of resonant atoms, in which a Raman grating is induced. Under such conditions, the interface can operate as a reflective diffraction grating. The cases of one- and two-dimensional gratings are considered. It is shown that the reflection coefficient, with the account of the selectively reflected wave, can be both greater or smaller than the usual Fresnel reflection coefficient. The Talbot effect can be observed for a selectively reflected wave in the near-field diffraction region. The spatial structure of the diffraction patterns essentially depends on the pump field intensity and the Raman detuning.В работе исследуется эффект Тальбота при селективном отражении пробного излучения на границе раздела диэлектрик — слой резонансных атомов, в котором индуцируется рамановская решетка. В таких условиях интерфейс может выступать как отражательная дифракционная решетка. Рассмотрены случаи одномерных и двумерных решеток. Показано, что коэффициент отражения с учетом селективно отраженной волны может быть как больше, так и меньше обычного коэффициента отражения Френеля. Эффект Тальбота можно наблюдать для селективно отраженной волны в ближней дифракционной области. Пространственная структура дифракционных картин существенно зависит от напряженности поля накачки и рамановской отстройки.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : Transmission and reflection spectra of a photonic crystal with a Raman defects
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 111, Is. 6. - P898-906. - ISSN 1063-7761, DOI 10.1134/S1063776110120022
Примечания : Cited References: 37. - This work was supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh-7810.2010.3), the Presidium of the Russian Academy of Sciences (project no. 27.1), the Ministry of Education and Science of the Russian Federation (state contract no. 02.740.11.0220), and the Siberian Branch, Russian Academy of Sciences (integration project no. 5).
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
SLOW-LIGHT
NONLINEAR OPTICS
MICROCAVITIES
LASERS
AMPLIFIER
MODES
Ключевые слова (''Своб.индексиров.''): group velocities--high frequency hf--microwatts--nonlinear refractive index--one dimensional photonic crystal--probe field--pump intensities--raman gain--raman resonances--reflection spectra--spectral position--three level atoms--transmission spectrums--defects--dispersion (waves)--probes--pumping (laser)--pumps--refractive index--resonance--photonic crystals
Аннотация: Features of Raman gain of probe radiation in three-level atoms placed in a defect of a one-dimensional photonic crystal in the presence of laser radiation (pump) at an adjacent high-frequency transition have been theoretically investigated. It has been shown that there is a pump intensity range where narrow peaks (resonances) simultaneously appear in the transmission and reflection spectra of the probe field. Beyond this region, the peak in the transmission spectrum is transformed to a narrow dip. The spectral position of these peaks is determined by the Raman resonance and the transmittance and reflectance can be larger than unity at pump intensities from several microwatts per square centimeter to several tens of milliwatts per square centimeter. The nature of narrow peaks is due to a sharp dispersion of a nonlinear refractive index near the Raman resonance; this dispersion is responsible for a strong decrease in the group velocity of probe radiation. The proposed scheme makes it possible to obtain controlled ultranarrow resonances in the transmission and reflection spectra of the photonic crystal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : Transmission and reflection spectra of a Raman induced grating in atomic media
Коллективы : International Conference “Basic Problems of Optics” (VIII; October 20–24, 2014; St. Petersburg)
Место публикации : Opt. Spectrosc.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 119, Is. 5. - P.770-775. - ISSN 0030-400X, DOI 10.1134/S0030400X1511003X
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, project no. 15-02-03959
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
OPTICS
Аннотация: The spectral properties of an electromagnetically induced grating that is based on the spatial modulation of the Raman gain in the field of a standing pump wave in a three-level homogeneous medium have been discussed. It has been shown that, by varying the intensity or the frequency of the pump field, one can control the transmission and reflection spectra, while the transmission and reflection coefficients of the probe (Raman) wave can simultaneously be greater than unity. The influence of the nonideality of the standing wave on the spectral characteristics of the grating has been studied. © 2015, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V.
Заглавие : Diffraction of electromagnetic waves on a one-dimensional strip conductor grating located at the interface between dielectric media
Коллективы : Ministry of Education and Science of the Russian Federation [14.607.21.0039]
Место публикации : Russ. Phys. J.: Springer, 2015. - Vol. 58, Is. 5. - P.646-657. - ISSN 1064-8887, DOI 10.1007/s11182-015-0546-1. - ISSN 15739228(eISSN)
Примечания : Cited References:17. - This work was supported in part by the Ministry of Education and Science of the Russian Federation (Agreement No. 14.607.21.0039).
Предметные рубрики: TRANSMISSION COEFFICIENTS
MULTILAYER STRUCTURE
BANDPASS-FILTERS
REFLECTION
Ключевые слова (''Своб.индексиров.''): electromagnetic waves--dielectric layers--strip conductors--diffraction
Аннотация: Analytical formulas are derived for the transmission and reflection coefficients of electromagnetic E- and H-waves incident at an arbitrary angle on a one-dimensional strip conductor grating located at the interface between two dielectric media. The feasibility of adjusting the grating reflectivity within wide limits by varying its design parameters is demonstrated, which allows these structures to be used in multilayered dielectric bandpass filters.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V.
Заглавие : Scattering of electromagnetic waves by a metal lattice placed at the interface of two media
Место публикации : J. Commun. Technol. Electron.: Maik Nauka-Interperiodica Publishing, 2017. - Vol. 62, Is. 7. - P.750-758. - ISSN 10642269 (ISSN), DOI 10.1134/S1064226917070026
Примечания : Cited References: 24
Ключевые слова (''Своб.индексиров.''): bandpass filters--electromagnetic waves--frequency bands--frequency response--optical multilayers--reflection--dielectric layer--efficient control--electromagnetic analysis--lattice periods--metal lattices--optical bandpass filters--scattering matrices--scattering of electromagnetic waves--electromagnetic wave scattering
Аннотация: Simple formulas for determination of components of the scattering matrix of a plane electromagnetic wave incident along the normal onto a thin infinite 2D metal lattice with square windows placed at the interface of two media are derived for the first time. Frequency responses (FRs) of this structure calculated with the use of these formulas agree well with responses obtained by the numerical electromagnetic analysis of a 3D model in the case when the lattice period is less than one-half of the wavelength. The capability of efficient control of the FR of the analyzed structure by means of variation in the width of conductors and the lattice period enables application of this lattice for fabrication of a reflector with prescribed reflectivity. Such reflectors at interfaces of dielectric layers are required, for example, in the design of multilayer sufaces radio transparent in a specified frequency band or optical bandpass filters.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Stanislavchuk T. N., Sirenko A. A., Kamenskyi D., Bezmaternykh L. N., Popova M. N.
Заглавие : Bifurcations of coupled electron-phonon modes in an antiferromagnet subjected to a magnetic field
Место публикации : Phys. Rev. Lett.: American Physical Society, 2017. - Vol. 118, Is. 16. - Ст.167203. - ISSN 00319007 (ISSN), DOI 10.1103/PhysRevLett.118.167203
Примечания : Cited References: 26. - This research was supported by the Russian Scientific Foundation under Grant No. 14-12-01033, the President of Russian Federation (MK-3577.2017.2, K. N. B.), and the U.S. Department of Energy under Grant No. DE-FG02-07ER46382 (experiments at U4-IR beam line NSLS-BNL, T. N. S. and A. A. S.). The National Synchrotron Light Source is operated as a user facility for the U.S. Department of Energy under Contract No. DE-AC02-98CH10886. Part of this work was supported by EMFL (Contract No. 26211). M. N. P. thanks B. Z. Malkin and A. V. Popov for helpful discussions.
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--bifurcation (mathematics)--electron-phonon interactions--electrons--magnetic fields--magnetism--temperature--antiferromagnetic crystals--bifurcation points--electron phonon couplings--electronic excitation--external magnetic field--field independents--low temperatures--reflection spectra--phonons
Аннотация: We report on a new effect caused by the electron-phonon coupling in a stoichiometric rare-earth antiferromagnetic crystal subjected to an external magnetic field, namely, the appearance of a nonzero gap in the spectrum of electronic excitations in an arbitrarily small field. The effect was registered in the low-temperature far-infrared (terahertz) reflection spectra of an easy-axis antiferromagnet PrFe3(BO3)4 in magnetic fields Bext-c. Both paramagnetic and magnetically ordered phases (including a spin-flop one) were studied in magnetic fields up to 30 T, and two bifurcation points were observed. We show that the field behavior of the coupled modes can be successfully explained and modeled on the basis of the equation derived in the framework of the theory of coupled electron-phonon modes, with the same field-independent electron-phonon interaction constant |W|=14.8 cm-1. © 2017 American Physical Society.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolotskikh L. T., Popov A. K.
Заглавие : Amplified phase-conjugate reflection of lambda = 10.51 MU-M radiation in gaseous SF6
Разночтения заглавия :авие SCOPUS: Amplified phase-conjugate reflection of λ=10.51 μm radiation in gaseous SF6
Место публикации : Appl. Phys. B. - 1983. - Vol. 31, Is. 3. - P.191-192. - ISSN 0721-7269, DOI 10.1007/BF00688842
Примечания : Cited References: 7
Ключевые слова (''Своб.индексиров.''): 42.65--lasers, carbon dioxide--sulfur compounds--sulfur hexafluoride--laser beams
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Maksimov D. N., Pankin P. S., Chen K. -P., Timofeev I. V.
Заглавие : Critical coupling vortex with grating-induced high Q-factor optical Tamm states
Место публикации : Opt. Express. - 2021. - Vol. 29, Is. 3. - P.4672-4680. - ISSN 10944087 (ISSN), DOI 10.1364/OE.416132
Примечания : Cited References: 54. - Funding. Ministry of Science and Technology, Taiwan (108-2923E-009-003-MY3); Russian Foundation for Basic Research (19-52-52006); Council on grants of the President of the Russian Federation (MK-46.2021.1.2)
Аннотация: We investigate optical Tamm states supported by a dielectric grating placed on top of a distributed Bragg reflector. It is found that under certain conditions the Tamm state may become a bound state in the continuum. The bound state, in its turn, induces the effect of critical coupling with the reflectance amplitude reaching an exact zero. We demonstrate that the critical coupling point is located in the core of a vortex of the reflection amplitude gradient in the space of the wavelength and angle of incidence. The emergence of the vortex is explained by the coupled mode theory.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Balaev D. A., Shaykhutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : Current-voltage characteristics of break junctions of high-T-c superconductors
Разночтения заглавия :авие SCOPUS: Current-voltage characteristics of break junctions of high-Tc superconductors
Место публикации : Physica C. - 2007. - Vol. 467, Is. 1-2. - P.80-84. - ISSN 0921-4534, DOI 10.1016/j.physc.2007.09.001
Примечания : Cited References: 19
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
ANDREEV REFLECTION
POLYCRYSTALLINE HTSC
WEAK LINKS
COMPOSITES
Ключевые слова (''Своб.индексиров.''): network of weak links--andreev reflection--hysteretic peculiarity--andreev reflection--hysteretic peculiarity--network of weak links--lanthanum compounds--mathematical models--polycrystalline materials--superconducting materials--andreev reflection--break junctions--hysteretic peculiarity--network of weak links--current voltage characteristics
Аннотация: The current-voltage (I-V) characteristics of break junctions of polycrystalline La1.85Sr0.15CuO4, Y0.75Lu0.25Ba2Cu3O7-delta, Bi1.8Pb0.3Sr1.9Ca2Cu3Ox and composite YBa2Cu3O7-delta + Ag are investigated. The experimental I-V curves exhibit the specific peculiarities of superconductor/normal-metal/superconductor junctions. The relation between an I-V characteristic of network of weak links and I-V dependencies of typical weak links is suggested to describe the experimental data. The I-V curves of typical weak links are calculated by the Kummel-Gunsenheimer-Nicolsky model considering the multiple Andreev reflections. (c) 2007 Elsevier B.V. All rights reserved.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedchenko, Dmitry P., Kim, Petr N., Timofeev I. V.
Заглавие : Photonic topological insulator based on frustrated total internal reflection in array of coupled prism resonators
Место публикации : Symmetry. - 2022. - Vol. 14, Is. 12. - Ст.2673. - ISSN 20738994 (eISSN), DOI 10.3390/sym14122673
Примечания : Cited References: 19
Аннотация: Total internal reflection occurs at the interface between two media with different refractive indices during propagation of light rays from a medium with a higher refractive index to a medium with a lower refractive index. If the thickness of the second medium is comparable to a specific light wavelength, then total internal reflection is violated partially or completely. Based on the frustrated total internal reflection, herein we discuss a two-dimensional photonic topological insulator in an array consisting of triangular, quadrangular, or hexagonal transparent prism resonators with a narrow gap between them. An array of prism resonators allows topologically stable edge solutions (eigenwaves) similar to those studied in ring resonators. Moreover, total internal reflection occurs at different angles of incidence of light. This makes it possible to obtain a set of fundamentally new edge solutions. The light is presumably concentrated at the surface; however, in the new solutions it penetrates relatively deep into the photonic topological insulator and excites several layers of prisms positioned beyond the surface. Remarkably, the direction of light propagation is precisely biased, and therefore new solutions exhibit lower symmetry than the resonator array symmetry.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M.
Заглавие : Computation of current-voltage characteristics of the SNS junctions
Место публикации : Physica C: ELSEVIER SCIENCE BV, 2007. - Vol. 460: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (JUL 09-14, 2006, Dresden, GERMANY). - P807-808. - ISSN 0921-4534, DOI 10.1016/j.physc.2007.04.078
Примечания : Cited References: 8
Предметные рубрики: WEAK LINKS
Ключевые слова (''Своб.индексиров.''): weak link--andreev scattering--subharmonic gap structure--andreev scattering--subharmonic gap structure--weak link--current voltage characteristics--nanowires--reflection--thermal effects--andreev scattering--microbridges--subharmonic gap structure--weak links--josephson junction devices
Аннотация: Simplified model for current-voltage characteristics of weak links (superconductor - normal metal - superconductor junctions, micro-bridges, superconducting nanowires) is suggested. It is based on approach which considers Andreev reflections as responsible for the transfer of dissipative current through the metallic Josephson junction. The current-voltage characteristics of tin microbridges at different temperatures were computed. (c) 2007 Elsevier B.V. All rights reserved.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M.
Заглавие : Description of hysteretic current-voltage characteristics of superconductor-normal metal-superconductor junctions
Место публикации : Supercond. Sci. Technol.: IOP PUBLISHING LTD, 2007. - Vol. 20, Is. 1. - P62-66. - ISSN 0953-2048, DOI 10.1088/0953-2048/20/1/011
Примечания : Cited References: 24
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTOR
WEAK LINKS
POLYCRYSTALLINE HTSC
ANDREEV REFLECTION
SIMPLIFIED MODEL
COMPOSITES
TRANSPORT
Ключевые слова (''Своб.индексиров.''): computational methods--current voltage characteristics--electric resistance--josephson junction devices--mathematical models--yttrium barium copper oxides--andreev reflection--metal superconductor junctions--metallic josephson junction--weak links--semiconductor junctions
Аннотация: A simplified model for the current-voltage characteristics of weak links is suggested. It is based on an approach considering the multiple Andreev reflection in a metallic Josephson junction. The model allows one to calculate the current-voltage characteristics of superconductor-normal metal-superconductor junctions with different thicknesses of normal layer at different temperatures. A hysteretic peculiarity of the V(I) dependence is described as a result of the negative differential resistance. The current-voltage characteristics of tin microbridges and high- T-c composite YBCO + BaPbO3 were computed.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Spectral properties of waves in superlattices with 2D and 3D inhomogeneities
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 2. - P.232-244. - ISSN 1063-7761, DOI 10.1134/S1063776111080061
Примечания : Cited References: 24. - This study was supported in part by the program of the Presidium of the Russian Academy of Sciences (grant no. 27.1), Federal Targeted Program (State contract no. 02.740.11.0220), and Targeted Programs "Development of the Higher School Scientific Potential" in 2009-2010 and 2011 years.
Предметные рубрики: X-RAY REFLECTION
PERTURBED FIELDS
MULTILAYERS
SUSCEPTIBILITY
PROPAGATION
INTERFACES
SCATTERING
SYSTEM
Аннотация: We investigate the dynamic susceptibility and one-dimensional density of states in an initially sinusoidal superlattice containing simultaneously 2D phase inhomogeneities simulating correlated rough-nesses of superlattice interfaces and 3D amplitude inhomogeneities of the superlattice layer materials. The analytic expression for the averaged Green's function of the sinusoidal superlattice with two phase inhomogeneities is derived in the Bourret approximation. It is shown that the effect of increasing asymmetry in the peak heights of dynamic susceptibility at the Brillouin zone boundary of the superlattice, which was discovered earlier [15] upon an increase in root-mean-square (rms) fluctuations, also takes place upon an increase in the correlation wavenumber of inhomogeneities. However, the peaks in this case also become closer, and the width and depth of the gap in the density of states decrease thereby. It is shown that the enhancement of rms fluctuations of 3D amplitude inhomogeneities in a superlattice containing 2D phase inhomogeneities suppresses the effect of dynamic susceptibility asymmetry and leads to a slight broadening of the gap in the density of states and a decrease in its depth. Targeted experiments aimed at detecting the effects studied here would facilitate the development of radio-spectroscopic and optical methods for identifying the presence of inhomogeneities of various dimensions in multilayer magnetic and optical structures.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Klimin S. A., Kashchenko M. A., Bezmaternykh L. N.
Заглавие : Spin-phonon and electron-phonon interactions in multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 evidenced by IR reflection spectroscopy
Коллективы : Russian Science Foundation [14-12-01033]; Swiss National Science Foundation (SNSF); Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva
Место публикации : J. Low Temp. Phys.: Springer/Plenum Publishers, 2016. - Vol. 185, Is. 5-6. - P.538-543. - ISSN 0022-2291, DOI 10.1007/s10909-016-1597-6. - ISSN 1573-7357(eISSN)
Примечания : Cited References:19. - The authors thank Alexey Kuzmenko and Marina Popova for fruitful discussions. This paper was supported by the Russian Science Foundation under Grant No. 14-12-01033, by the Swiss National Science Foundation (SNSF), and by the Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva.
Предметные рубрики: PHASE-TRANSITIONS
GdFe3(BO3)4
CRYSTALS
SPECTRUM
Ключевые слова (''Своб.индексиров.''): multiferroics--ir-active phonons--spin-phonon interaction--coupled--electron-phonon mode
Аннотация: We study temperature-dependent polarized reflection spectra of multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 single crystals. Signatures of spin–lattice interactions in both compounds and of a formation of the electron–phonon coupled mode in TbFe3(BO3)4 are discussed.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chzhan A. V., Patrin G. S., Kiparisov S. Y., Seredkin V. A., Burkova L. V., Velikanov D. A.
Заглавие : Magnetic and magneto-optical properties of Co-P films prepared by chemical deposition
Место публикации : J. Magn. Magn. Mater. - 2011. - Vol. 323, Is. 20. - P.2493-2496. - OCT. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2011.05.024
Примечания : Cited Reference Count: 22. - Гранты: This study was supported by the Russian Foundation for Basic Research, Project no. 08-02-00397a and the departmental target program Development of Scientific Potential of Higher Education, 2009-2010, Project no. 2.1.1./4399.Финансирующая организация: Russian Foundation for Basic Research [08-02-00397a]; departmental target program Development of Scientific Potential of Higher Education [2.1.1./4399]
Предметные рубрики: SPECTROSCOPY
THICKNESS
COBALT
Ключевые слова (''Своб.индексиров.''): co-p films--chemically deposition--the polar kerr and faraday effects--hysteresis loops--chemically deposition--cop films--hysteresis loops--the polar kerr and faraday effects--chemical deposition--chemically deposition--co films--cop films--film magnetization--film surface morphology--incident light--magnetic and magneto-optical properties--magnetic layers--polar kerr effect--polar-kerr--polycrystalline--underlayers--chemical analysis--faraday effect--hysteresis loops--kerr magnetooptical effect--light reflection--magnetic materials--optical kerr effect--palladium--cobalt
Аннотация: Features in the formation of chemically deposited polycrystalline Co-P films with thicknesses of a few nanometers are established by analyzing film surface morphology and variation in the film magnetization. It is shown that in the thickness range below 30 nm the polar Kerr effect value OK changes nonmonotonically and depends on a wavelength of the incident light. For the films thicker than 30 nm, this value depends weakly on both the thickness and the wavelength. These features in the OK behavior are attributed to the Faraday effect, which is revealed at small thicknesses upon light reflection from the lower surface of a magnetic layer. It is found that the Faraday effect in the Co-P films exceeds that in the Co films by a factor of more than two. This effect is assumed to be caused by the presence of a Pd underlayer in the samples under study. (C) 2011 Elsevier BY. All rights reserved.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaylov M. I., Muzalevskiy K. V., Mironov V. L.
Заглавие : Testing semi-empirical model of reflection coefficient based on GNSSR measurements
Коллективы : IEEE International Geoscience and Remote Sensing Symposium
Место публикации : IEEE J. Sel. Top. Appl. Earth Observ. Remote Sens.: Proc.: IEEE-Institute Electrical and Electronics Engineers, 2016. - P.5264 - 5267. - ISSN 978-1-5090-3332-4, DOI 10.1109/IGARSS.2016.7730371. - ISSN 2153-7003 (eISSN)
Примечания : The study was performed thanks to a grant from the Russian Science Foundation (project №14-17-00656)
Ключевые слова (''Своб.индексиров.''): permittivity model--smos--microwave radiometry--arctic tundra--soil moisture--soil temperature
Аннотация: In this paper, with using of semi-empirical model of the reflection coefficient, which is implementing to calculate the brightness temperature of the SMOS spacecraft at 1.4GHz in [1], [2] the soil moisture was retrieved from the reflection coefficients, which were measured by GNSS-reflectometer at a test site on the Yamal Peninsula. The model of reflection coefficient with root-mean square error (RMSE) of 0.04 allows to predict the experimental values of the reflection coefficient and with RMSE of less than 0.09cm3/cm3 allows to retrieve the soil moisture in the layer of 0-6cm
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