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A dielectric model of thawed and frozen Arctic soils considering frequency, temperature, texture and dry density / V. L. Mironov, A. Yu. Karavayskiy, Yu. I. Lukin, I. P. Molostov // Int. J. Remote Sens. - 2020. - Vol. 41, Is. 10. - P. 3845-3865, DOI 10.1080/01431161.2019.1708506. - Cited References: 39 . - ISSN 0143-1161. - ISSN 1366-5901
Аннотация: A dielectric model was developed for thawed and frozen mineral soils, based on the refractive mixing dielectric formula and the dielectric measurement data for three soils collected in the Arctic tundra of the Yamal Peninsula. The refractive mixing dielectric model was used in conjunction with the Debye multi relaxation equations as a theoretical model to fit the measured complex relative permittivity spectra as a function of soil moisture and temperature. As a result, the dielectric spectroscopic parameters for the various components of water in the soil, such as the low- and high-frequency limits of the complex relative permittivity, the times of the corresponding relaxations, and the specific conductivity, were simultaneously determined for soils with different clay contents for all measured temperatures. As the theoretical temperature dependences of these parameters, the Clausius–Mossotti, Eyring, and linear equations for the conductivity were used. By using approximations of the measured data with these formulas, the parameters of the temperature-dependent model were derived, such as the coefficient of volume expansion, energy and entropy of activation, and coefficient of thermal conductivity. A set of the parameters discussed above in conjunction with the refractive mixing formula is a temperature- and mineralogically dependent multi-relaxation spectroscopic dielectric model, which enables estimation of the permittivity of moist soils as a function of dry soil density, moisture, frequency, temperature, and texture. The statistical error of the proposed dielectric model was estimated in terms of the normalized root-mean-square error (nRMSE), which was equal to 5% and 25% for the dielectric constant and dielectric loss factor, respectively.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Altai State University, Barnaul, Russia

Доп.точки доступа:
Mironov, V. L.; Миронов, Валерий Леонидович; Karavayskiy, A. Yu.; Каравайский, Андрей Юрьевич; Lukin, Y. I.; Лукин, Юрий Иванович; Molostov, I. P.
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Ab initio and empirical modeling of lithium atoms penetration into silicon / N. S. Mikhaleva [et al.] // Comput. Mater. Sci. - 2015. - Vol. 109. - P. 76-83, DOI 10.1016/j.commatsci.2015.06.024. - Cited References: 69. - The authors would like to thank the Institute of Computational Modeling SB RAS, Krasnoyarsk, Information Technology Centre Novosibirsk State University, for providing access to their computational resources. The reported study was supported by RFBR, research project No. 14-02-31071, 14-02-31309, 12-02-00640, by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project No. NSh-2886.2014.2), Increase Competitiveness Program of NUST "MISiS" (No. K2-2015-033). The authors also would like to thank Prof. Stephan Irle and L.R. Moskvina for fruitful discussions and helpful ideas. . - ISSN 0927-0256

РУБ Materials Science, Multidisciplinary
Рубрики:
LONG CYCLE LIFE
   CORE-LEVEL SPECTROSCOPY
   CARBON-COATED SILICON
   AUGMENTED-WAVE METHOD
   ION BATTERIES
   MOLECULAR-DYNAMICS
   INTERATOMIC POTENTIALS
   ELECTRONIC-STRUCTURE
   CRYSTALLINE SILICON
   SI(100)2X1 SURFACE
Кл.слова (ненормированные):
Li-ion batteries -- Silicon -- Surface diffusion -- Li diffusion -- Density functional theory -- Molecular dynamics
Аннотация: A process of lithium atoms penetration into silicon (1 0 0) subsurface layers was investigated with the help of DFT method. It was shown that, while the concentration of lithium adatoms on reconstructed (1 0 0) silicon surface is low, the bonding energy of lithium atoms in the subsurface layers is smaller than the bonding energy on the surface, so lithium atoms are unlikely to migrate into the crystal. When the (1 0 0) silicon surface is covered by 2 layers of lithium, migration into the subsurface layer becomes favorable. In addition to this, the reconstruction of the surface changes to the form with symmetric dimers as the concentration increases. Thus, all possible lithium migration paths become energy-wise equal, so the rate of lithium atom transfer into silicon crystal rises. In addition to the ab initio calculations, an ad-hoc empirical interatomic potential was developed and the kinetics of lithium diffusion into silicon were studied. It was shown that lithium penetration proceeds in a layer-by-layer way with a sharp border between undoped and lithiated silicon. This is accounted for the fact that, once a tetrahedral interstice is occupied by a lithium atom, the migration barriers between the adjacent interstices become lower and the rate of diffusion increases. © 2015 Elsevier B.V. All rights reserved.

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Держатели документа:
L.V. Kirensky Institute of Physics SB RAS, 50 bld. 38 Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation
National University of Science and Technology MISiS, 4 Leninskiy pr., Moscow, Russian Federation

Доп.точки доступа:
Mikhaleva, N. S.; Михалева, Наталья Сергеевна; Visotin, M. A.; Popov, Z. I.; Попов, Захар Иванович; Kuzubov, A. A.; Кузубов, Александр Александрович; Fedorov, A. S.; Федоров, Александр Семенович
}
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    Kuzubov, A. A.
    Ab initio investigation of a new boron nitride allotrope / A. A. Kuzubov, L. V. Tikhonova, A. S. Fedorov // Phys. Status Solidi B. - 2014. - Vol. 251, Is. 6. - P. 1282-1285, DOI 10.1002/pssb.201350389. - Cited References: 31. - We acknowledge support of the Russian Foundation for Basic Research through Grant No. 12-02-00640. Also, we thank the Institute of Computer Modeling (Siberian Division, Russian Academy of Sciences, Krasnoyarsk), the Joint Supercomputer Center of the Russian Academy of Sciences (Moscow), the computer cluster "Chebyshev" of the Moscow State University (Moscow), and the supercomputer of the Institute of Space and Information Technologies of the Siberian Federal University for providing an opportunity to use their computers for performing all calculations. . - ISSN 0370-1972. - ISSN 1521-3951
Рубрики:
AUGMENTED-WAVE METHOD
   MOLECULAR-DYNAMICS
   TRANSITION
   METALS
Кл.слова (ненормированные):
boron nitride -- computational materials science -- density functional theory -- elastic properties -- superhard materials
Аннотация: A new allotropic superhard and superdense structure of sp3-bonded boron nitride (hP3-BN) is proposed. Geometric electronic, elastic, and optical properties of the structure are investigated by density functional theory generalized gradient approximation (DFT-GGA) calculations. It is shown that the structure is an insulator with a band gap of 5.06 eV; is density is 5.03% higher than that of cubic boron nitride (c-BN) and its bulk modulus is 2.25% higher than that of c BN. The calculated hP3-BN refractive index in the range 200-800 nm is significantly higher than the indexes of diamond and all known carbon allotropes, expect for the analogous carbon h-P3 structure, and it has a large optical dispersion. In the range above 800 nm the refractive index changes from 2.60 to 2.35. (C) WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk Railway Transport Inst, Krasnoyarsk 660028, Russia

Доп.точки доступа:
Tikhonova, L. V.; Fedorov, A. S.; Федоров, Александр Семенович; Кузубов, Александр Александрович; Russian Foundation for Basic Research [12-02-00640]
}
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Ab initio LC-DFT study of graphene, multilayer graphenes and graphite / P. V. Avramov [et al.] // Chem. Phys. Lett. - 2011. - Vol. 508, Is. 1-3. - P. 86-89, DOI 10.1016/j.cplett.2011.04.016. - Cited References: 32. - This work was supported by JAEA Research fellowship (P.V.A.). P.V.A. also acknowledges JAEA ASRC and Molecular Spintronics Group for hospitality and fruitful collaboration. . - ISSN 0009-2614

РУБ Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
DENSITY
   NANORIBBONS
   PERFORMANCE
   FUNCTIONALS
   FULLERENE
   COBALT
   FILMS
Аннотация: Atomic structure of graphene, bi-, tri-, tetralayer graphenes and graphite as well was studied using ab initio HSE, LDA and PBE DFT approaches in periodic boundary conditions. Based on comparison of theoretical results with experimental data the performance of the methods was estimated. It was found that long-range corrected HSE potential is the most reliable DFT approximation to reproduce the atomic structure of weakly bound multilayer graphenes and graphite as well. (C) 2011 Elsevier B. V. All rights reserved.

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Держатели документа:
[Avramov, Pavel V.
Sakai, Seiji
Entani, Shiro
Matsumoto, Yoshihiro
Naramoto, Hiroshi] Japan Atom Energy Agcy, Adv Sci Res Ctr, Naka, Ibaraki 3191195, Japan
[Avramov, Pavel V.] LV Kirenskii Inst Phys, SB RAS, Krasnoyarsk 660036, Russia
[Avramov, Pavel V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Sakai, S.; Entani, S.; Matsumoto, Y.; Naramoto, Hiroshi
}
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Fedorov, A. S.
Ab initio study of hydrogen chemical adsorption on platinum surface/carbon nanotube join system / A. S. Fedorov, P. B. Sorokin, A. A. Kuzubov // Phys. Status Solidi B. - 2008. - Vol. 245, Is. 8. - P. 1546-1551, DOI 10.1002/pssb.200844155. - Cited References: 31 . - ISSN 0370-1972

РУБ Physics, Condensed Matter
Рубрики:
WALLED CARBON NANOTUBES
   MOLECULAR-DYNAMICS
   ROOM-TEMPERATURE
   STORAGE
   ENERGY
   THERMODYNAMICS
   GRAPHITE
   DENSITY
   POINTS
Аннотация: The process of hydrogen chemical adsorption on platinum cluster/single wall carbon nanotube (CNT) join surfaces is modelled at various temperatures and pressures. For that, the adsorption energy of hydrogen atoms on surfaces of both platinum (111) plate and CNT (5,5) or (8,8) types is calculated by density functional theory with the PBE approximation. At various temperatures the hydrogen atom hopping rate on both platinum and CNT surfaces is calculated by the transition state theory. Furthermore the hydrogen hopping rate from the platinum surface to the attached nanotube is obtained by calculation of the total energy profile. It is proved that hydrogen atoms can migrate easily at the platinum surface at all temperatures, but at the CNT surface they can migrate beginning at 400-500 K. By calculation of chemical potentials of hydrogen in gas or on CNT or platinum cluster surfaces the equilibrium density of adsorbed hydrogen was calculated at different temperatures and pressures. It is established that for all temperatures in the range 300-900 K and for all pressures less than 500 bar, the hydrogen is dissociated and chemically adsorbed on the platinum surface very effectively, but surface site occupation by hydrogen on attached CNT surface is rather small. But if CNT vacancies are present in the tube structure and the temperature is lower then 450 K, hydrogen atoms can be adsorbed effectively enough on these vacancies. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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Держатели документа:
[Fedorov, Alexander S.
Sorokin, Pavel B.
Kuzubov, Alexander A.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Fedorov, Alexander S.] Moscow Railroad Transport Engn Inst, Krasnoyarsk 660028, Russia
[Sorokin, Pavel B.
Kuzubov, Alexander A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Railroad Transport Institute, 660028 Krasnoyarsk, Russian Federation
Siberian Federal University, 79 Svobodniy av, 660041 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sorokin, P. B.; Kuzubov, A. A.; Кузубов, Александр Александрович; Федоров, Александр Семенович
}
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Nemtsev, A. V.
Ab initio study of the polarization, electronic, magnetic, and optical properties of perovskite SrMO3 (M = Fe, Mn) crystals and thin films containing magnetic ions / A. V. Nemtsev, V. S. Zhandun, V. I. Zinenko // J. Exp. Theor. Phys. - 2018. - Vol. 126, Is. 4. - P. 497-505, DOI 10.1134/S1063776118030056. - Cited References: 30 . - ISSN 1063-7761
Кл.слова (ненормированные):
Antiferromagnetism -- Density functional theory -- Electronic properties -- Iron compounds -- Manganese compounds -- Optical properties -- Perovskite -- Perovskite solar cells -- Polarization -- Strontium compounds
Аннотация: The magnetic, electronic, and polarization properties of the SrFeO3 and SrMnO3 compounds with a perovskite structure are calculated using the density functional theory in the bulk and thin-film states. A ferroelectric instability is found to be absent in the bulk state, and the polar mode is softened in the thin-film state of SrMnO3 in the presence of tensile stresses in the substrate. As a result, a polar phase with a polarization of 23 μC/cm2 appears, which agrees with experimental data. The study of the magnetic and electronic properties demonstrates the existence of G-type antiferromagnetic ordering in SrMnO3 and the appearance of a dielectric gap of about 1.5 eV in its thin film. A ferromagnetic phase with metallic conduction in both the bulk and thin-film states is detected in SrFeO3.

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Публикация на русском языке Немцев, Андрей В. Исследования ab initio электронных, магнитных и оптических свойств кристаллов и тонких пленок перовскитов SrMeOs (Me = Fe, Mn), содержащих магнитные ионы [Текст] / А. В. Немцев, В. С. Жандун, В. И. Зиненко // Журн. эксперим. и теор. физ. - 2018. - Т. 153 Вып. 4. - С. 605-614

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Zhandun, V. S.; Жандун, Вячеслав Сергеевич; Zinenko, V. I.; Зиненко, Виктор Иванович; Немцев, Андрей В.
}
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Action of the atomic and electronic structure of pheromone molecules on the effectiveness of communication in xylophagous insects / P. V. Artyushenko [et al.] // J. Struct. Chem. - 2016. - Vol. 57, Is. 2. - P. 287-293, DOI 10.1134/S0022476616020074. - Cited References:27. - This work was supported by RFBR projects Nos. 13-04-00375 and16-04-00132. . - ISSN 0022-4766. - ISSN 1573-8779

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
Monochamus-galloprovincialis coleoptera
   Density-functional theories
   Beetle Ips-typographus
   Pine sawyer beetle
   Aggregation pheromone
   Cerambycidae
   Attraction
   Components
   Attack
   Set
Кл.слова (ненормированные):
atomic and electronic structure -- functional density methods -- absorption -- spectra -- excited states -- xylophages -- pheromones
Аннотация: The B3LYD /6-31(p,d) density functional method is applied to pheromones of the forest xylophagous insects Ips typographus L., Monochamus urussovi Fisch., and Monochamus galloprovincialis Oliv. to calculate the absorption spectra and find excited states. The calculated results are used to assess the possible activity of the molecules when they are affected by solar radiation.

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Публикация на русском языке Влияние атомной и электронной структуры молекул феромонов на эффективность коммуникации насекомых-ксилофагов [Текст] / П. В. Артюшенко [и др.] // Журн. структ. химии. - 2016. - Т. 57 № 2. - С. 304-310

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.
Russian Acad Sci, Siberian Branch, KSC Presidium, Int Res Ctr Studies Extreme States Organism, Krasnoyarsk, Russia.
Russian Acad Sci, Siberian Branch, Sukachev Inst Forest, Krasnoyarsk, Russia.

Доп.точки доступа:
Artyushenko, P. V.; Артюшенко, Полина Владимировна; Tomilin, F. N.; Томилин, Феликс Николаевич; Kuzubov, A. A.; Кузубов, Александр Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Tsikalova, P. E.; Ovchinnikova, T. M.; Soukhovolsky, V. G.; RFBR [13-04-00375, 16-04-00132]
}
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Gokhfeld, D. M.
An extended critical state model: Asymmetric magnetization loops and field dependence of the critical current of superconductors / D. M. Gokhfeld // Phys. Solid State. - 2014. - Vol. 56, Is. 12. - P. 2380-2386, DOI 10.1134/S1063783414120129. - Cited References: 37 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
CRITICAL-CURRENT DENSITY
   HIGH-TEMPERATURE SUPERCONDUCTORS
   II SUPERCONDUCTORS
   SURFACE-BARRIER
   MGB2
   TRANSPORT
   MOTION
   J(C)
   PEAK
Аннотация: An extended critical state model has been developed. The model has considered the equilibrium magnetization of a surface layer and the magnetization of the central region of a superconducting sample. The magnetic flux distributions in the sample have been calculated. An analytical dependence of the critical current density on the magnetic field with different behaviors in strong and weak fields has been proposed. A relation of the asymmetry of the magnetization loops and the critical current density to the sample size has been established. The model is applicable to the parameterization of magnetization loops of single-crystal and polycrystalline superconductors.

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Публикация на русском языке Гохфельд, Денис Михайлович. Расширенная модель критического состояния: асимметричные петли намагниченности и полевые зависимости критического тока сверхпроводников [Текст] / Д. М. Гохфельд // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2014. - Т. 56 Вып. 12. - С. 2298-2304

Доп.точки доступа:
Гохфельд, Денис Михайлович
}
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    Gokhfeld, D. M.
    Analysis of superconductor magnetization hysteresis / D. M. Gokhfeld // J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 2. - P. 219-221 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2018-11-2-219-221. - Cited References: 9 . - ISSN 1997-1397
   Перевод заглавия: Анализ петель намагниченности сверхпроводников
Кл.слова (ненормированные):
Pinning -- Abrikosov vortices -- Critical state -- Critical current density -- Trapped flux -- пиннинг -- вихри Абрикосова -- критическое состояние -- плотность критического тока -- захваченное поле
Аннотация: The critical state model and the extended critical state model are described to analyse a magnetization hysteresis and to find superconductor parameters. We discuss how geometric sizes and form influence on magnetization hysteresis, critical current and trapped flux.
Описано использование модели критического состояния и расширенной модели критического состояния для определения параметров сверхпроводников из измеренных петель намагниченности. Обсуждается влияние геометрических размеров и формы образцов на вид петель намагниченности, критический ток и замороженное магнитное поле.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50/38, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Гохфельд, Денис Михайлович

}
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10.

    Analytic gradient for the adaptive frozen orbital bond detachment in the fragment molecular orbital method / D. G. Fedorov [et al.] // Chem. Phys. Lett. - 2009. - Vol. 477, Is. 1-3. - P. 169-175, DOI 10.1016/j.cplett.2009.06.072. - Cited Reference Count: 49. - Гранты: We thank Professor M. Suenaga of Kyushu University for continuing his development of the modeling software FACIO and its FMO interface. D. G. F. and K. K. were supported by the a Grant-in- Aid for Scientific Research (JSPS, Japan) and the Next Generation SuperComputing Project, Nanoscience Program (MEXT, Japan). J.H.J. was supported by a Skou Fellowship from the Danish Research Agency (Forskningsradet for Natur og Univers). - Финансирующая организация: JSPS, Japan; Next Generation SuperComputing Project; MEXT, Japan; Danish Research Agency . - JUL 28. - ISSN 0009-2614
Рубрики:
DENSITY-FUNCTIONAL THEORY
   GEOMETRY OPTIMIZATIONS
   SEMICONDUCTOR NANOWIRES
   SILICON NANOWIRES
   METHOD FMO
   ENERGY
   SURFACES
   RECONSTRUCTION
   CHEMISTRY
   PROTEINS
Кл.слова (ненормированные):
Energy gradients -- Fragment molecular orbital methods -- Future applications -- Geometry optimization -- Numerical criteria -- Silicon Nanowires -- Molecular modeling -- Molecular orbitals
Аннотация: We have developed and implemented the analytic energy gradient for the bond detachment scheme in the fragment molecular orbital method (FMO) suitable to describe solids, and applied it to the geometry optimization of a silicon nanowire at several levels of theory. In addition, we have examined in detail the effects of the particular choice of the fragmentation upon the accuracy and introduced a number of numerical criteria to characterize the errors. The established route is expected to provide guidance for future applications of FMO to surfaces, solids and nanosystems. (C) 2009 Elsevier B. V. All rights reserved.

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Держатели документа:
Natl Inst Adv Ind Sci & Technol, RICS, Tsukuba, Ibaraki 3058568, Japan
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Univ Copenhagen, Dept Chem, DK-2100 Copenhagen, Denmark
Kyoto Univ, Grad Sch Pharmaceut Sci, Sakyo Ku, Kyoto 6068501, Japan

Доп.точки доступа:
Fedorov, D.G.; Kitaura, K.; Avramov, P. V.; Аврамов, Павел Вениаминович; Jensen, J.H.
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11.

Andreev reflections and experimental current-voltage characteristics of break junctions of polycrystalline HTSC / M. I. Petrov [et al.] // Physica C. - 2004. - Vol. 408: 7th International Conference on Materials and Mechanisms of Superconductive and High Temperature Superconductors (MAY 25-30, 2003, Rio de Janeiro, BRAZIL). - P. 620-622, DOI 10.1016/j.physc.2004.03.085. - Cited References: 3 . - ISSN 0921-4534

РУБ Physics, Applied

Кл.слова (ненормированные):
Andreev reflections -- break junction -- current-voltage characteristics -- Andreev reflections -- Break junction -- Current-voltage characteristics -- Andreev reflections -- Break junctions -- Elastic scattering -- Lattice defects -- Negative differential resistance -- Electric fields -- Heuristic methods -- Hysteresis -- Microcracks -- Polycrystalline materials -- Probability density function -- Quasicrystals -- Superconducting materials -- Yttrium barium copper oxides -- Current voltage characteristics
Аннотация: The temperature evolution of current-voltage characteristics (CVCs) of break junctions made from polycrystalline Y0.75Lu0.25Ba2Cu3O7 and La1.85Sr0.15CuO4 is investigated. The experimental CVCs have hysteretic features that reflect a part of a curve with negative differential resistance. The temperature evolution of the CVCs is discussed within the framework of the Kummel-Gunsenheimer-Nicolsky theory for superconductor/normal-metal/superconductor junctions considering multiple Andreev reflections. It is shown that the shape of the CVCs of break junctions is determined by the ratio of the number of "short" and "long" intergrain normal regions in the polycrystalline HTSC under investigation. (C) 2004 Elsevier B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
ИФ СО РАН
Kirensky Intitute of Physics, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Reshetnev Siberian Stt. Aerosp. U., 660014 Krasnoyarsk, Russian Federation
Inst. fur Theor. Phys./Astrophys., Universitat Wurzburg, D-97074 Wurzburg, Germany

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaihutdinov, K. A.; Kummel, R.
}
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12.

Anisotropic magnetization of an NbN film / D. M. Gokhfeld, N. E. Savitskaya, S. I. Popkov [et al.] // J. Exp. Theor. Phys. - 2022. - Vol. 134, Is. 6. - P. 707-712, DOI 10.1134/S1063776122060097. - Cited References: 31. - We are grateful to I.V. Nemtsev for measurements on the scanning electron microscope, S.A. Skorobogatov for his help in magnetic measurements (scanning electron microscopy and magnetic measurements have been performed at the Krasnoyarsk Regional Collective Usage Center of the Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”) . - ISSN 1063-7761
Кл.слова (ненормированные):
Critical currents -- Magnetization -- Niobium compounds -- Nitrogen compounds -- Reactive sputtering -- Scanning electron microscopy -- Superfluid helium -- Anisotropic magnetization -- Columnar structures -- Field orientation -- Film magnetization -- Film surfaces -- Liquid helium temperature -- Magnetization loops -- Niobium nitride films -- Quartz substrate -- Structural and magnetic properties -- Current density
Аннотация: The structural and magnetic properties of a niobium nitride (NbN) film prepared by reactive sputtering onto a quartz substrate are investigated. It is shown using scanning electron microscopy that the film has a columnar structure with a diameter of crystallite columns of about 50 nm. The film magnetization loops are measured for the field orientation parallel and perpendicular to its surface. Based on the experimental data, the critical current densities of the film are estimated in both cases. For the field parallel to the film surface, the estimate is 6.5 × 104 A/cm2 at the liquid helium temperature. For the field perpendicular to the surface, the critical current density is close to the depairing current density (107 A/cm2). Analysis of the results based on different models of magnetic vortex pinning in superconductors shows that in the former case, pinning occurs at the boundaries of columns in the bulk of the sample, while in the latter case, it is determined by the influence of the surface barrier.

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Публикация на русском языке Анизотропная намагниченность пленки NbN [Текст] / Д. М. Гохфельд, Н. Е. Савицкая, С. И. Попков [и др.] // Журн. эксперим. и теор. физ. - 2022. - Т. 161 Вып. 6. - С. 833-839

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Konstantinov Petersburg Nuclear Physics Institute, Nation Research Center “Kurchatov Institute”, Leningrad oblast, Gatchina, 188300, Russian Federation
Krasnoyarsk Electric Railway-Carriage Repair Works, Krasnoyarsk, 660021, Russian Federation
Mordovia State University, Saransk, 430000, Russian Federation

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Savitskaya, N. E.; Popkov, S. I.; Kuzmichev, N. D.; Vasyutin, M. A.; Balaev, D. A.; Балаев, Дмитрий Александрович
}
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13.

Val'kov, V. V.
Anomalies in the characteristics of electronic structure upon a quantum phase transition to a state with two order parameters and the breaking of time-reversal symmetry / V. V. Val’kov, A. O. Zlotnikov // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 6. - P. 616-619, DOI 10.3103/S106287381606040X. - Cited References: 9 . - ISSN 1062-8738
Кл.слова (ненормированные):
Antiferromagnetism -- Electronic structure -- Phase transitions -- Temperature distribution -- Antiferromagnetic order parameter -- Density of state -- Landau expansion -- Periodic Anderson model -- Quantum phase transitions -- Temperature dependence -- Time reversal symmetries -- Two order parameters -- Quantum theory
Аннотация: Based on the periodic Anderson model, microscopic expressions for the Ginzburg–Landau expansion coefficients in a phase with superconducting and antiferromagnetic order parameters are obtained. Temperature dependences of the order parameters near the temperature of the transition to this phase are established. The emergence of anomalous properties upon the quantum phase transition to the phase with two order parameters is investigated. This transition is accompanied by drastic reconstruction of the density of states, reflected by the interplay between superconductivity and antiferromagnetism. © 2016, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Аномалии характеристик электронной структуры при квантовом фазовом переходе в состояние с двумя параметрами порядка и нарушенной симметрией относительно инверсии времени [Текст] / В. В. Вальков, А. О. Злотников // Изв. РАН. Сер. физ. - 2016. - Т. 80 № 6. - С. 683-686

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович
}
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14.

Kagan, M. Y.
Anomalous resistivity and superconductivity in the two-band Hubbard model with one narrow band (Review) / M. Y. Kagan, V. V. Valkov // Low Temp. Phys. - 2011. - Vol. 37, Is. 1. - P. 69-82 ; Физика низких температур, DOI 10.1063/1.3552118. - Cited References: 62. - We thank A.S. Alexandrov, A.F. Andreev, M.A. Baranov, Yu. Bichkov, A.V. Chubukov, D.V. Efremov, A.S. Hewson, K.A. Kikoin, F.V. Kusmartsev, P. Nozieres, T.M. Rice, A.O. Sboychakov, P. Thalmeer, C.M. Varma, D. Vollhardt, P. Woelfle, A. Yaresko and, especially, P. Fulde, Yu. Kagan, K.I. Kugel, and N.V. Prokof'ev for many simulating discussions on this subject and acknowledge the financial support of RFBR grants # 08-02-00224 and 08-02-00212. M.Yu.K. is also grateful to the Leverhulme trust for a grant to visit Loughborough University, where this work was completed. . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
FERMI-LIQUID BEHAVIOR
   MAGNETIC-ALLOYS
   HEAVY
   DENSITY
   SYSTEMS
   STATE
   UPT3
   MECHANISM
   PARTICLE
   VALENCE
Аннотация: We search for marginal Fermi-liquid behavior in the two-band Hubbard model with one narrow band. We consider the limit of low electron densities in the bands and strong intraband and interband Hubbard interactions. We analyze the influence of electron-polaron effects and other mechanisms for mass-enhancement (related to the momentum dependence of the self-energies) on the effective mass and scattering times of light and heavy components in the clean case (electron-electron scattering and no impurities). We find a tendency towards phase separation (towards negative partial compressibility of heavy particles) in the 3D case with a large mismatch between the densities of heavy and light bands in the strong coupling limit. We also find that for low temperatures and equal densities, the resistivity in a homogeneous state R(T) proportional to T-2 behaves as a Fermi-liquid in both 3D and 2D. For temperatures greater than the effective bandwidth for heavy electrons T W-h*, the coherence of the heavy component breaks down completely. The heavy particles move diffusively in the surrounding light particles. At the same time, light particles scatter on heavy particles as if on immobile (static) impurities. Under these conditions, the heavy component is marginal, while the light component is not. The resistivity approaches saturation for T W-h* in the 3D case. In 2D the resistivity has a maximum and a localization tail owing to weak-localization corrections of the Altshuler-Aronov type. This behavior of resistivity in 3D could be relevant for some uranium-based heavy-fermion compounds such as UNi2Al3 and in 2D, for some other mixed-valence compounds, possibly including layered manganites. We also consider briefly the superconductive (SC) instability in this model. The leading instability tends to p-wave pairing and is governed by an enhanced Kohn-Luttinger mechanism for SC at low electron densities. The critical temperature corresponds to the pairing of heavy electrons via polarization of the light electrons in 2D. (C) 2011 American Institute of Physics. [doi:10.1063/1.3552118]

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Держатели документа:
[Kagan, M. Yu.] Russian Acad Sci, PL Kapitza Phys Problems Inst, Moscow 119334, Russia
[Valkov, V. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
P.L.Kapitza Institute for Physical Problems of the Russian Academy of Sciences, 2 Kosygin St., Moscow 119334, Russian Federation
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Valkov, V. V.; Вальков, Валерий Владимирович

}
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15.

Application of the new LDA plus GTB method for the band structure calculation of n-type cuprates / M. M. Korshunov [et al.] // Physica B. - 2006. - Vol. 378-80: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P. 459-460, DOI 10.1016/j.physb.2006.01.340. - Cited References: 11 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
SUPERCONDUCTIVITY
PARAMETERS
DENSITY
Кл.слова (ненормированные):
strongly correlated electron systems -- superconductivity -- n-type cuprates -- n-type cuprates -- Strongly correlated electron systems -- Superconductivity -- Electronic structure -- Hamiltonians -- Mathematical models -- Oxide superconductors -- Perturbation techniques -- Intercluster hopping -- N-type cuprates -- Strongly correlated electron systems -- Band structure
Аннотация: A novel hybrid scheme is proposed and applied for band structure calculations of undoped n-type cuprate Nd2CuO4. The ab initio LDA calculation is used to obtain single electron and Coulomb parameters of the multiband Hubbard-type model. In strong correlation regime the electronic structure within this model is calculated by the generalized tight-binding (GTB) method, that combines the exact diagonalization of the model Hamiltonian for a small cluster with perturbation treatment of the intercluster hopping and interactions. For Nd2CuO4, this scheme results in charge transfer insulator with value of the gap and band dispersion in agreement to the experimental data. (c) 2006 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620219, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Institute of Metal Physics, Russian Academy, Sciences-Ural Division, GSP-170, 620219 Yekaterinburg, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Nekrasov, I. A.; Pchelkina, Z. V.; Anisimov, V. I.
}
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16.

Atom-density distribution in a metal vapor cell studied by 3rd-harmonic generation / M. K. Kodirov [et al.] // Appl. Phys. B. - 1988. - Vol. 45, Is. 1. - P. 47-52, DOI 10.1007/BF00692341. - Cited References: 20 . - ISSN 0721-7269

РУБ Physics, Applied

Кл.слова (ненормированные):
42.65 -- 42.80 -- CESIUM AND ALLOYS - Applications -- LIGHT - Nonlinear Optical Effects -- SPECTROSCOPY - Measurements -- ATOM-DENSITY DISTRIBUTION -- CESIUM VAPORS -- METAL VAPOR CELL -- THIRD-HARMONIC GENERATION -- VAPORS

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Держатели документа:
USSR Academy of Sciences, Siberian Branch, L. V. Kirensky Institute of Physics, Krasnoyarsk, SU-66036, Russia

Доп.точки доступа:
Kodirov, M. K.; Popov, A. K.; Попов, Александр Кузьмич; Slabko, V. V.; Слабко, Виталий Васильевич; Yakhnin, V. Z.
}
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17.

    Atomic Structure and Energetic Stability of Complex Chiral Silicon Nanowires / P. V. Avramov [et al.] // J. Phys. Chem. C. - 2010. - Vol. 114, Is. 35. - P. 14692-14696, DOI 10.1021/jp1016399. - Cited Reference Count: 36. - Гранты: This work was supported by a CREST (Core Research for Evolutional Science and Technology) grant in the Area of High Performance Computing for Multiscale and Multiphysics Phenomena from the Japan Science and Technology Agency (JST) and a collaborative RFBR-JSPS grant No. 09-02-92107-Phi. S.I. also acknowledges support by the Program for Improvement of Research Environment for Young Researchers from Special Coordination Funds for Promoting Science and Technology (SCF) commissioned by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan. L.Ch. acknowledges support by the Presidium of Russian Academy of Sciences (Program No. 27). - Финансирующая организация: CREST (Core Research for Evolutional Science and Technology); Japan Science and Technology Agency (JST); RFBR-JSPS [09-02-92107]; Special Coordination Funds for Promoting Science and Technology (SCF); Presidium of Russian Academy of Sciences [27] . - SEP 9. - ISSN 1932-7447
Рубрики:
DENSITY-FUNCTIONAL METHODS
   GROWTH
   EXCHANGE
   NANOHELICES
   NANOSPRINGS
Кл.слова (ненормированные):
Ab initio -- Atomic structure -- Chiral complexes -- Consecutive shifts -- DFT method -- Energetic stability -- HOMO-LUMO gaps -- Metastable structures -- Potential barriers -- Si atoms -- Silicon Nanowires -- Unit cell parameters -- Atoms -- Chirality -- Electronic structure -- Enantiomers -- Metastable phases -- Nanowires -- Stereochemistry -- Wire -- Crystal atomic structure
Аннотация: Atomic and electronic structure and energetic stability of newly proposed pentagonal and hexagonal chiral complex silicon nanowires (NWs) composed of five or six (I 10) oriented crystalline fragments were studied using the ab initio DFT method. The chirality of the wires was caused by consecutive shifts of each fragment by 1/5 or 1/6 of the wire unit cell parameter and rotations of 4 degrees and 3.3 degrees for achiral pentagonal or hexagonal wires, respectively. Chirality causes the HOMO-LUMO gap to reduce by 0.1 eV. Chiral silicon nanowires are found to be metastable structures with a 4,5 (kcal/mol)/Si atom potential barrier for reversible chiral achiral transformation.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Kyoto Univ, Fukui Inst Fundamental Chem, Sakyo Ku, Kyoto 6068103, Japan
Nagoya Univ, Inst Adv Res, Nagoya, Aichi 4648602, Japan
Nagoya Univ, Dept Chem, Nagoya, Aichi 4648602, Japan
Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Minami, S.; Morokuma, K.; Irle, S.; Chernozatonskii, L.A.
}
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18.

    Atypical quantum confinement effect in silicon nanowires / P. B. Sorokin [et al.] // J. Phys. Chem. A. - 2008. - Vol. 112, Is. 40. - P9955-9964, DOI 10.1021/jp805069b. - Cited Reference Count: 25. - Гранты: This work was in part partially supported by a CREST (Core Research for Evolutional Science and Technology) grant in the Area of High Performance Computing for Multiscale and Multiphysics Phenomena from the Japan Science and Technology Agency (JST) as well as by Russian Fund of Basic Researches (grant 08-02-01096) (L.A.C.). P.V.A. acknowledges the encouragement of Dr. Keiji Morokuma, Research Leader at Fukui Institute for Fundamental Chemistry. The geometry of all presented structures was visualized by ChemCraft software.SUP25/SUP L.A.C. acknowledges I. V. Stankevich for help and fruitful discussions. P.B.S. is grateful to the Joint Supercomputer Center of the Russian Academy of Sciences for access to a cluster computer for quantum-chemical calculations. - Финансирующая организация: Japan Science and Technology Agency (JST); Russian Fund of Basic Researches [08-02-01096] . - OCT 9. - ISSN 1089-5639
Рубрики:
ELECTRONIC-STRUCTURE
   OPTICAL-PROPERTIES
   SI
   DENSITY
   WIRES
   EXCHANGE
   ATOMS
   DOTS
Кл.слова (ненормированные):
Electric wire -- Energy gap -- Gallium alloys -- Mathematical models -- Nanostructured materials -- Nanostructures -- Nanowires -- Quantum confinement -- Quantum electronics -- Semiconductor quantum dots -- Silicon -- Ami methods -- Band gaps -- Blue shifts -- Dinger equations -- Linear junctions -- Monotonic decreases -- Quantum confinement effects -- Quantum dots -- Semiempirical -- Silicon nanowires -- System sizes -- Theoretical models -- Nanocrystalline silicon -- nanowire -- quantum dot -- silicon -- article -- chemistry -- electron -- quantum theory -- Electrons -- Nanowires -- Quantum Dots -- Quantum Theory -- Silicon
Аннотация: The quantum confinement effect (QCE) of linear junctions of silicon icosahedral quantum dots (IQD) and pentagonal nanowires (PNW) was studied using DFT and semiempirical AM1 methods. The formation of complex IQD/PNW structures leads to the localization of the HOMO and LUMO on different parts of the system and to a pronounced blue shift of the band gap; the typical QCE with a monotonic decrease of the band gap upon the system size breaks down. A simple one-electron one-dimensional Schrodinger equation model is proposed for the description and explanation of the unconventional quantum confinement behavior of silicon IQD/PNW systems. On the basis of the theoretical models, the experimentally discovered deviations from the typical QCE for nanocrystalline silicon are explained.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
LV Kirenskii Inst Phys, SB RAS, Krasnoyarsk 660036, Russia
RAS, N M Emanuel Inst Biochem Phys, Moscow 119334, Russia
Kyoto Univ, Fukui Inst Fundamental Chem, Kyoto 6068103, Japan
Natl Inst Adv Ind Sci & Technol, Res Inst Computat Sci, Tsukuba, Ibaraki 3058568, Japan

Доп.точки доступа:
Sorokin, P. B.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Avramov, P. V.; Chernozatonskii, L.A.; Fedorov, D.G.
}
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19.

Band-gap unification of partially Si-substituted single-wall carbon nanotubes / P. V. Avramov [et al.] // Phys. Rev. B. - 2006. - Vol. 74, Is. 24. - Ст. 245417, DOI 10.1103/PhysRevB.74.245417. - Cited References: 72 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
SILICON-CARBIDE NANOTUBES
   DENSITY-FUNCTIONAL THEORY
   TOTAL-ENERGY CALCULATIONS
   WAVE BASIS-SET
   ELECTRONIC-STRUCTURE
   AB-INITIO
   NANORODS
   EXCITATIONS
   TRANSITION
   NANOWIRES
Аннотация: The atomic and electronic structure of a set of pristine single wall SiC nanotubes as well as Si-substituted carbon nanotubes and a SiC sheet was studied by the local-density approximation (LDA) plane wave band structure calculations. Consecutive substitution of carbon atoms by Si leads to a gap opening in the energetic spectrum of the metallic (8,8) SWCNT with approximately quadratic dependence of the band gap upon the Si concentration. The same substitution for the semiconductor (10,0) single wall carbon nanotubes (SWCNT) results in a band gap minimum (0.27 eV) at similar to 25% of Si concentration. In the Si concentration region of 12-18 %, both types of nanotubes have less than 0.5 eV direct band gaps at the Gamma-Gamma point. The calculation of the chiral (8,2) SWSi0.15C0.85NT system gives a similar (0.6 eV) direct band gap. The regular distribution of Si atoms in the atomic lattice is by similar to 0.1 eV/atom energetically preferable in comparison with a random distribution. Time dependent density functional theory (DFT) calculations showed that the silicon substitution sufficiently increases (roughly by one order of magnitude) the total probability of optical transitions in the near infrared region, which is caused by the opening of the direct band gap in metallic SWCNTs, the unification of the nature and energy of the band gaps of all SWCNT species, the large values of Si3p parallel to r parallel to Si3s radial integrals and participation of Si3d states in chemical bonding in both valence and conductance bands.

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Держатели документа:
Japan Atom Energy Res Inst, Adv Sci Res Ctr, Takasaki Branch, Takasaki, Gumma 3701292, Japan
RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
RAS, Inst Biochem Phys, Moscow 119991, Russia
AIST, Res Inst Computat Sci, Tsukuba, Ibaraki 3058568, Japan
Kyoto Univ, Dept Energy Sci & Technol, Sakyo Ku, Kyoto 6068501, Japan
ИФ СО РАН
Takasaki-branch, Advanced Science Research Center, Japan Atomic Energy Agency, Takasaki, 370-1292, Japan
L.V. Kirensky Institute of Physics SB RAS, 660036 Krasnoyarsk, Russian Federation
Institute of Biochemical Physics of RAS, 119991 Moscow, Russian Federation
Research Institute for Computational Science, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8568, Japan
Department of Energy Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Sorokin, P. B.; Fedorov, A. S.; Федоров, Александр Семенович; Fedorov, D. G.; Maeda, Y.
}
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20.

Calculating the energy of vacancies and adatoms in a hexagonal SiC monolayer / A. A. Kuzubov [et al.] // Russ. J. Phys. Chem. A. - 2012. - Vol. 86, Is. 7. - P. 1091-1095, DOI 10.1134/S0036024412070138. - Cited References: 21 . - ISSN 0036-0244

РУБ Chemistry, Physical
Рубрики:
INITIO MOLECULAR-DYNAMICS
ELECTRONIC-PROPERTIES
ABSORPTION-SPECTRA
Кл.слова (ненормированные):
silicon carbide -- defects -- adatoms -- density functional method
Аннотация: It is noted that the development of semiconductor SiC-electronics is prevented by a low quality of grown silicon carbide single crystals. It is found that structural defects of a substrate penetrating into an epitaxial layer upon subsequent homoepitaxial growth can considerably degrade a device's characteristics. We investigate the effect of the deformation of a hexagonal SiC monolayer on vacancy stability and material properties, and study the processes of silicon and carbon adatom migration over a surface of SiC.

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Публикация на русском языке Расчет энергии вакансий и адатомов в монослое гексагонального SiC [Текст] / А. А. Кузубов [и др.] // Журн. физ. химии. - 2012. - Т. 86 № 7. - С. 1207-1211

Держатели документа:
[Kuzubov, A. A.
Eliseeva, N. S.
Tomilin, F. N.
Tolstaya, A. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Kuzubov, A. A.
Krasnov, P. O.
Tomilin, F. N.
Fedorov, A. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Kuzubov, A. A.
Krasnov, P. O.] Siberian State Technol Univ, Krasnoyarsk 660049, Russia

Доп.точки доступа:
Kuzubov, A. A.; Кузубов, Александр Александрович; Eliseeva, N. S.; Krasnov, P. O.; Краснов, Павел Олегович; Tomilin, F. N.; Томилин, Феликс Николаевич; Fedorov, A. S.; Федоров, Александр Семенович; Tolstaya, A. V.
}
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