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Application of DMA 242 C for quasi-static measurements of piezoelectric properties of solids / P. P. Turchin, V. I. Turchin, S. V. Yurkevich [et al.] // J. Sib. Fed. Univ. Math. Phys. - 2020. - Vol. 13, Is. 1. - P. 97-103 ; Журн. СФУ. Матем. и физика, DOI 10.17516/1997-1397-2020-13-1-97-103. - Cited References: 26. - The reported study was funded by Russian Foundation for Basic Research project no. 18-42-240016, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: "Electromechanical Properties and Anisotropy of Acoustic Wave Propagation in Yttrium Aluminoborates Single Crystals" . - ISSN 1997-1397
Кл.слова (ненормированные):
Piezoelectric modules -- Quasistatic method -- Multiferroics
Аннотация: An experimental device for quasi-static measurements of piezoelectric moduli dijk, based on the possibilities of precision variations in mechanical stresses with the device DMA 242 C in the frequency range 0-100 Hz has been developed. A special sample holder and a charge amplifier are used in the measuring scheme. The measurements of piezoelectric moduli values of trigonal piezoelectric single crystalls La3Ga5SiO14 (P321) and YAl3(BO3)4 (R32), as well as hexagonal ZnO (P63mc) have been carried out.

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Держатели документа:
Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Turchin, P. P.; Турчин, Павел Петрович; Turchin, V. I.; Yurkevich, S. V.; Sukhodaev, P. O.; Raikova, I. S.

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    Lundin, A. A.
    Asymptotic similarity of time correlation functions and shape of the 13C and 29Si NMR spectra in diamond and silicon / A. A. Lundin, V. E. Zobov // J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 2. - P. 305-315, DOI 10.1134/S1063776118080216. - Cited References: 47. - We thank V.A. Atsarkin, V.V. Demidov, F.S. Dzheparov, and E. B. Feldman for the discussion of our results. This work was supported by a subsidy allocated by the Institute of Chemical Physics of the Russian Academy of Science for the State assignment, theme 0082-2018-0005, code TSITIS AAAA-A18-118020690203. . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
SPIN SYSTEMS
   LINE-SHAPES
   RELAXATION
   SOLIDS
   PARAMAGNETS
   RESONANCE
Аннотация: Based on the proposed theory, we have investigated the shape of the NMR absorption spectra for 13C and 29Si nuclei in diamond and silicon crystals attributable to the internuclear dipole–dipole interaction. In accordance with the available experimental data, we have considered both crystals with a 100% content of magnetoactive isotopes and crystals with a comparatively low dilution by nonmagnetic nuclei. The time correlation functions (the first of which is the Fourier transform of the NMR spectrum) arising in an infinite chain of coupled differential equations are shown to be mutually similar with a slight time delay. The proposed theory allows the spectrum to be calculated analytically. The results obtained agree satisfactorily with the experimental ones. It is noted that the mutual similarity of the time correlation functions is probably a corollary of the development of dynamical chaos in the system.

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Публикация на русском языке Лундин, Андрей Арнольдович. Асимптотическое подобие временных корреляционных функций и форма спектров ЯМР 13C и 29Si в алмазе и кремнии [Текст] / А. А. Лундин, В. Е. Зобов // Журн. эксперим. и теор. физ. - 2018. - Т. 154 Вып. 2. - С. 354–367

Держатели документа:
Russian Acad Sci, Semenov Inst Chem Phys, Vorobevskoe Sh 26, Moscow 117977, Russia.
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr,Siberian Branch, Akademgorodok 50, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zobov, V. E.; Зобов, Владимир Евгеньевич; Institute of Chemical Physics of the Russian Academy of Science [0082-2018-0005, TSITIS AAAA-A18-118020690203]
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Kolovsky, A. R.
Atomtronics: Landauer-Büttiker equation for bosonic carriers / A. R. Kolovsky, S. M. Wimberger // Humboldt Kolleg. Controlling quantum matter: From ultracold atoms to solids : conference materials. - 2018

Материалы конференции,
Смотреть тезисы

Доп.точки доступа:
Wimberger, Sandro; Коловский, Андрей Радиевич; Controlling quantum matter: From ultracold atoms to solids, Humboldt Kolleg(2018 ; July 29 - August 2 ; Vilnius, Lithuania); Vilnius UniversityLithuanian Physical Society
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Current-driven channel switching and colossal positive magnetoresistance in the manganite-based structure / N. V. Volkov [et al.] // J. Phys. D. - 2009. - Vol. 42, Is. 6. - Ст. 65005, DOI 10.1088/0022-3727/42/6/065005. - Cited References: 20. - This study was supported by the RFBR, Projects No 08-02-00259-a and 08-02-00397-a, the KRSF-RFBR 'Enisey-2007', Project No 07-02-96801-a and the Division of Physical Sciences of RAS, Program 'Spin-dependent Effects in Solids and Spintronics' (Project No 2.4.2 of SB RAS). . - ISSN 0022-3727

РУБ Physics, Applied

Кл.слова (ненормированные):
Colossal magnetoresistance -- Electric resistance -- Electronic structure -- Magnetic field effects -- Magnetoelectronics -- Manganese -- Manganites -- Oxide minerals -- Schottky barrier diodes -- Semiconductor junctions -- Silicides -- Tunnel junctions -- Tunnels -- Bottom layers -- Channel switching -- Conducting channels -- Conducting layers -- Current-driven -- Current-in-plane geometries -- Depletion layers -- Ferromagnetic state -- Layered structures -- Low-resistance contacts -- Magnetic tunnel junctions -- Magneto-transport properties -- Manganese silicides -- Manganite films -- New mechanisms -- Positive magnetoresistances -- Positive MR -- Potential barriers -- Spin-polarized -- Tunnel structures -- Voltage-current characteristics -- Current voltage characteristics
Аннотация: The transport and magnetotransport properties of a newly fabricated tunnel structure manganite/depletion layer/manganese silicide have been studied in the current-in-plane (CIP) geometry. A manganite depletion layer in the structure forms a potential barrier sandwiched between two conducting layers, one of manganite and the other of manganese silicide. The voltage-current characteristics of the structure are nonlinear due to switching conducting channels from an upper manganite film to a bottom, more conductive MnSi layer with an increase in the current applied to the structure. Bias current assists tunnelling of a carrier across the depletion layer; thus, a low-resistance contact between the current-carrying electrodes and the bottom layer is established. Below 30 K, both conducting layers are in the ferromagnetic state (magnetic tunnel junction), which allows control of the resistance of the tunnel junction and, consequently, switching of the conducting channels by the magnetic field. This provides a fundamentally new mechanism of magnetoresistance (MR) implementation in the magnetic layered structure with CIP geometry. MR of the structure under study depends on the bias current and can reach values greater than 400% in a magnetic field lower than 1 kOe. A positive MR value is related to peculiarities of the spin-polarized electronic structures of manganites and manganese silicides.

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Держатели документа:
[Volkov, N. V.
Eremin, E. V.
Tsikalov, V. S.
Patrin, G. S.
Kim, P. D.] SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Volkov, N. V.
Patrin, G. S.] Siberian Fed Univ, Dept Phys, Krasnoyarsk 660041, Russia
[Seong-Cho, Yu
Kim, Dong-Hyun] Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea
[Chau, Nguyen] Natl Univ Hanoi, Ctr Mat Sci, Hanoi, Vietnam
ИФ СО РАН
Kirensky Institute of Physics, SB RAS, Krasnoyarsk 660036, Russian Federation
Department of Physics, Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Department of Physics, Chungbuk National University, Cheongju 361-763, South Korea
Center for Materials Science, National University of Hanoi, 334 Nguyen Trai, Hanoi, Viet Nam

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Tsikalov, V. S.; Patrin, G. S.; Патрин, Геннадий Семёнович; Kim, P. D.; Ким, Пётр Дементьевич; Seong-Cho, Y.; Kim, D. H.; Chau, N.; RFBR [08-02-00259-a, 08-02-00397-a]; KRSF-RFBR [07-02-96801-a]; Division of Physical Sciences of RAS; Program 'Spin-dependent Effects in Solids and Spintronics' [2.4.2]
}
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    Lundin, A. A.
    Decoherence-induced stabilization of the multiple-quantum NMR-spectrum width / A. A. Lundin, V. E. Zobov // Appl. Magn. Reson. - 2016. - Vol. 47, Is. 7. - P. 701-710, DOI 10.1007/s00723-016-0770-z. - Cited References:26 . - ISSN 0937-9347. - ISSN 1613-7507
   Перевод заглавия: Cтабилизация ширины многоквантового спектра ЯМР вследствие затухания

РУБ Physics, Atomic, Molecular & Chemical + Spectroscopy
Рубрики:
SIMULATIONS
   DYNAMICS
   SYSTEMS
   SOLIDS
Аннотация: The time dependence of an increase in the number of correlated spins in cluster was calculated for a particular variant of multiple-quantum (MQ) nuclear magnetic resonance spectroscopy using an effective two-quantum Hamiltonian that includes conventional secular nuclear dipole-dipole interaction as a weak perturbation at the stage of correlation preparation. It was shown that the cluster size grows steadily, while the width of the MQ spectrum stabilizes because the decay rates of the spectral components located at different areas of the MQ spectrum are different. The MQ bandwidth was also calculated as a function of the preparation time for various perturbation strengths. The results obtained are in excellent agreement with the experimental data reported in Alvarez and Suter (Phys Rev A 84:012320, 2011).

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Держатели документа:
Russian Acad Sci, Semenov Inst Chem Phys, Ul Kosygina 4, Moscow 117977, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zobov, V. E.; Зобов, Владимир Евгеньевич
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    Doping dependent band structure and pairing in strongly correlated electron systems of high-Tc cuprates / S. G. Ovchinnikov [и др.] // V International symposium on strong nonlinear vibronic and electronic interactions in solids : program, book of abstracts . - 2015. - Ст. O18. - P. 28. - Библиогр.: 1 назв.
   Перевод заглавия: Зависящие от допирования зонная структура и спаривание в системах с сильными электронными корреляциями ВТСП купратов

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Korshunov, M. M.; Коршунов, Максим Михайлович; Makarov, I. A.; Макаров, Илья Анатольевич; International symposium on strong nonlinear vibronic and electronic interactions in solids(5 ; 2015 ; May ; 1-3 ; Tartu)
}
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    Zobov, V. E.
    Effect of degradation processes caused by a small perturbation on the growth of the average cluster size of correlated spins in multiple quantum NMR spectroscopy of solids / V. E. Zobov, A. A. Lundin // Appl. Magn. Reson. - 2021. - Vol. 52. Is. 7. - P. 879–892, DOI 10.1007/s00723-021-01342-1. - Cited References: 33. - The study is funded by the Ministry of Science and Higher Education of the Russian Federation in the framework of the State assignment, State registration number AAAA-A19-119012890064-7 . - ISSN 0937-9347
   Перевод заглавия: Влияние процессов деградации, вызванных малым возмущением, на рост среднего размера кластера коррелированных спинов в многоквантовой ЯМР спектроскопии твердых тел
Кл.слова (ненормированные):
Nuclear magnetic resonance spectroscopy -- Average size -- Cluster sizes -- Degradation process -- Multiple quantum NMR spectroscopy -- Orthogonal operators -- Over-complete -- Small perturbations -- Velocity ratio -- Cluster analysis
Аннотация: Multiple quantum (MQ) NMR spectroscopy of solids allows one to observe the growth and decay of multispin correlations. As a rule, the average size of the cluster of correlated spins is extracted from the width of the MQ spectrum. In the present article, the size distribution of such clusters is explored. To obtain the above distribution, the solutions for the amplitudes of the decomposition over complete sets of orthogonal operators for the two different models were used. By means of these models, we have taken into account the dependence of cluster degradation (the degradation of a cluster means, e.g., destruction of correlations in cluster or loss of particles in it) through two positions. The first one defines by the cluster size while the second one depends on the MQ coherence order of the cluster. It is shown that in dependence of the relation the rates of these degradation processes, the width of the MQ spectrum carries different information. If the first process is faster that the second one, then the width of the MQ spectrum is still determined by the average cluster size. When the velocity ratio becomes inverse, the width of the MQ spectrum takes on a smaller value, which is a consequence of the faster degradation of the MQ spectrum components with large orders of coherence.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 117977, Russian Federation

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
}
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Effect of gadolinium on magnetic circular dichroism and electron magnetic resonance of ε-Fe2O3 nanoparticles formed in borate glasses / I. Edelman [et al.] // J. Non-Cryst. Solids. - 2019. - Vol. 506. - P. 68-79, DOI 10.1016/j.jnoncrysol.2018.12.006. - Cited References: 81. - The work is supported by Russian Academy of Sciences in the frame of the Project № 0356-2017-0030. . - ISSN 0022-3093
Кл.слова (ненормированные):
Iron oxides -- ε-Fe2O3 -- Borate glasses -- Nanoparticles -- Magnetic circular dichroism -- Electron magnetic resonance
Аннотация: A remarkable characteristic of borate glasses is the ability of forming magnetic nanoparticles at low doping with transition element oxides. We have studied structure and magnetic properties of iron oxide nanoparticles formed in borate glasses, in particular, concentration and temperature dependences of magnetic circular dichroism (MCD) and electron magnetic resonance (EMR) spectra. A series of glasses of molar composition 22.5K2O-22.5Al2O3–55B2O3 doped with 1.5 mass % of Fe2O3 and different contents of Gd2O3 from 0.1 to 1.0 mass % was prepared using a conventional melt quenching technique and subjected to an additional thermal treatment. The whole set of results allows to identify the predominant magnetic phase in these glasses as ε-Fe2O3 nanoparticles, with a considerable part of iron ions substituted by gadolinium. Analysis and computer simulations of the EMR spectra allow separating the contribution of electron paramagnetic resonance of diluted iron ions and together with the temperature dependences of magnetization demonstrate a superparamagnetic character of the nanoparticle magnetism.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
LOMA, UMR 5798 Universite de Bordeaux-CNRS, Talence cedex, 33405, France
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch of RAS, Novosibirsk, 630090, Russian Federation
NRC “Kurchatov Institute”, Moscow, 123182, Russian Federation
Vavilov State Optical Institute, St.-Petersburg, 199053, Russian Federation

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Kliava, J.; Ivanova, O. S.; Иванова, Оксана Станиславовна; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Zaikovskii, V.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Zubavichus, Y.; Stepanov, S.
}
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Zobov, V. E.
Effect of intramolecular interaction on time growth of second moment of multiple quantum NMR in solids / V. E. Zobov, A. A. Lundin // INTERNATIONAL CONFERENCE ON RESONANCES IN CONDENSED MATTER: ALTSHULER100. Ser. Journal of Physics Conference Series : IOP PUBLISHING LTD, 2011. - Vol. 324: International Conference on Resonances in Condensed Matter (JUN 21-25, 2011, Kazan, RUSSIA). - Ст. 12010, DOI 10.1088/1742-6596/324/1/012010. - Cited References: 12 . - ISBN 1742-6588

РУБ Physics, Condensed Matter
Рубрики:
COHERENCES
DYNAMICS
Кл.слова (ненормированные):
Dipole dipole interactions -- Double-quantum -- Intramolecular interactions -- Multiple quantum NMR -- Nuclear spin system -- Quantum spectrum -- Rate increase -- Second moments -- Solids containing methyl groups -- Time dependence -- Functional groups -- Quantum optics -- Solids -- Spin dynamics -- Hamiltonians
Аннотация: The time dependence of the NMR multiple quantum spectrum in solids containing methyl groups is investigated. We studied both of types of the nuclear spin systems: namely linking by secular part of the mutual dipole-dipole interaction and linking by effective double quantum Hamiltonian. It is revealed for the first type of systems the rate with the time of the growing up of the second moment when intramolecular interaction is present becomes less in compare with situation when a strong intramolecular interaction is absent. On the contrary for the second type of Hamiltonian the above rate increases.

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Держатели документа:
[Zobov, V. E.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russian Federation
N.N. Semenov Institute of Chemical Physics, RAS, 117977, Moscow, Russian Federation

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
}
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10.

Effect of intramolecular interaction on Time Growth of Second Moment of Multiple-Quantum NMR in Solids [Text] / V. E. Zobov, A. A. Lundin // Int. Conf. "Resonances in Condensed Matter" : Book of abstracts. - 2011. - PTh06

Доп.точки доступа:
Zobov, V.E.; Lundin, A.A.; "Resonances in Condensed Matter", International Conference(2011 ; Jun. ; 21-25 ; Kazan, Russia)
}
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11.

Nikolaev, S. V.
Electronic structure of the Hubbard and t-J models within the cluster perturbation theory in the X-operators representa / S. V. Nikolaev, V. I. Kuz’min, S. G. Ovchinnikov // V Int. symp. on strong nonlinear vibronic and electronic int. in solids : program, book of abstracts. - 2015. - Ст. O20. - P30. - Библиогр.: 2 назв.

Материалы конференции

Доп.точки доступа:
Kuz’min, V. I.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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12.

    Electronic structure of β-RbNd(MoO4)2 by XPS and XES / V. V. Atuchin [et al.] // J. Phys. Chem. Solids. - 2015. - Vol. 77. - P. 101-108, DOI 10.1016/j.jpcs.2014.09.012. - Cited References: 52. - This study was partially supported by the Ministry of Education and Science of the Russian Federation and RFBR Grant 12-02-90806-mol_rf_nr. . - ISSN 0022-3697
   Перевод заглавия: Электронная структура b-RbNd(MoO4)2, исследованная при помощи РФЭС и РСМА

РУБ Chemistry, Multidisciplinary + Physics, Condensed Matter
Рубрики:
RAY-EMISSION-SPECTROSCOPY
   CRYSTAL-STRUCTURE
   PHOTOELECTRON-SPECTROSCOPY
   LUMINESCENCE PROPERTIES
   VIBRATIONAL PROPERTIES
   PHOTOEMISSION SPECTRA
   OPTICAL-PROPERTIES
   TERNARY MOLYBDATE
   AB-INITIO
   SYSTEM
Кл.слова (ненормированные):
Inorganic compounds -- Chemical synthesis -- Photoelectron spectroscopy -- X-ray diffraction -- Electronic structure
Аннотация: β-RbNd(MoO4)2 microplates have been prepared by the multistage solid state synthesis method. The phase composition and micromorphology of the final product have been evaluated by XRD and SEM methods. The electronic structure of β-RbNd(MoO4)2 molybdate has been studied employing the X-ray photoelectron spectroscopy (XPS) and X-ray emission spectroscopy (XES). For the molybdate, the XPS core-level and valence-band spectra, as well as XES bands representing energy distribution of the Mo 4d- and O 2p-like states, have been measured. It has been established that the O 2p-like states contribute mainly to the upper portion of the valence band with also significant contributions throughout the whole valence-band region. The Mo 4d-like states contribute mainly to a lower valence band portion

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Держатели документа:
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia
Natl Acad Sci Ukraine, Frantsevich Inst Problems Mat Sci, UA-03142 Kiev, Ukraine
SB RAS, Baikal Inst Nat Management, Lab Oxide Syst, Ulan Ude 670047, Russia
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Nanodiagnost & Nanolithog, Novosibirsk 630090, Russia

Доп.точки доступа:
Atuchin, V. V.; Khyzhun, O. Y.; Chimitova, O. D.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Gavrilova, T. A.; Bazarov, B. G.; Bazarova, J. G.; Ministry of Education and Science of the Russian Federation; RFBR [12-02-90806-mol_rf_nr]
}
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13.

Electrophysical properties of hydroxylated endohedral metallofullerene with gadolinium / A. I. Dudnik [et al.] // J. Phys. Chem. Solids. - 2019. - Vol. 135. - Ст. 109094, DOI 10.1016/j.jpcs.2019.109094. - Cited References: 35. - The reported study was funded by RFBR according to the research project No 18-29-19003. . - ISSN 0022-3697
Кл.слова (ненормированные):
Endohedral metallofullerene -- Fullerenol -- Impedance -- Dielectric permittivity -- Ionic and proton conductivity -- Dielectric hysteresis -- Polarizability
Аннотация: The paper presents the results of experimental measurements of constitutive and electrophysical properties in hydroxylated endohedral metallofullerene with gadolinium sample. We extracted endohedral metallofullerene from carbon condensate, synthesized in high-frequency arc discharge plasma. Later hydroxyl groups were added. Via methods of infrared and x-ray photoelectronic spectroscopy, it was established that the molecules of hydroxylated endohedral metallofullerene have the Gd@C82Ox(OH)y, x + y=(40–42) composition. The method of measuring the electrical impedance in the frequency range from 100 Hz to 100 MHz shows that the resulting hydroxylated fullerene is an ion conductor. The measured frequency dependences of the dielectric permittivity and conductivity of hydroxylated fullerene are explained based on the assumption of an inhomogeneous distribution of electric charges in the material volume. Dielectric-hysteresis loops in the frequency range of 25 Hz–1 MHz and temperature range of 80–300 K, and volt-ampere characteristics were measured. The obtained results imply the appearance of residual polarization induced by the electric field in hydroxylated fullerene. However, the constant dipole moment is absent. © 2019

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Dudnik, A. I.; Дудник, Александр Иванович; Vnukova, N. G.; Внукова, Наталья Григорьевна; Drokin, N. A.; Дрокин, Николай Александрович; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Shestakov, N. P.; Шестаков, Николай Петрович; Tomashevich, Y. V.; Churilov, G. N.; Чурилов, Григорий Николаевич
}
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14.

Fedorov, A. S.
Employment of curvilinear coordinates in ab initio calculations of insulators using pseudopotentials / A. S. Fedorov // Phys. Solid State. - 1999. - Vol. 41, Is. 2. - P. 213-218, DOI 10.1134/1.1131090. - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE CALCULATIONS
   ALKALINE-EARTH OXIDES
   HIGH-PRESSURE
   FORMALISM
   SOLIDS
Аннотация: The standard ab initio scheme for calculating the structure of crystals using nonlocal pseudopotentials is modified for use in curvilinear coordinates. A method for solving the Poisson equation for the Coulomb potential in a curved space in the k representation is found. It is shown in the example of calculations for crystals of insulators having an NaCl structure that the employment of a curved space permits a very significant decrease in the required size of the basis set. (C) 1999 American Institute of Physics. [S1063-7834(99)01102-8].

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Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

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Федоров, Александр Семенович
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15.

Val'kov, V. V.
Energy structure of high-temperature superconductors with the intersite Coulomb interaction / V. V. Val'kov, M. M. Korovushkin // Eur. Phys. J. B. - 2009. - Vol. 69, Is. 2. - P. 219-227, DOI 10.1140/epjb/e2009-00141-4. - Cited References: 26. - This study was supported by the program "Quantum physics of condensed matter"of the Presidium of the Russian Academy of Sciences (RAS); the Russian Foundation for Basic Research (project no. 07-02-00226); the Siberian Branch of RAS (Interdisciplinary Integration project no. 53). One of authors (M. K.) would like to acknowledge the support of the Dynasty Foundation. . - ISSN 1434-6028

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TC SUPERCONDUCTIVITY
   SINGLE-BAND
   ELECTRON CORRELATIONS
   CU OXIDES
   J MODEL
   DERIVATION
Кл.слова (ненормированные):
Strongly correlated electron systems; heavy fermions -- Narrow-band systems; intermediate-valence solids -- Cuprate superconductors -- Strongly correlated electron systems heavy fermions -- Narrow-band systems intermediate-valence solids -- Cuprate superconductors -- Emery model -- Energy structures -- Fermi state -- Integrated density -- Root mean squares -- Spectral intensity -- Copper compounds -- Corundum -- Coulomb interactions -- Electrons -- Fermions -- High temperature superconductors -- Oxide superconductors -- Superconductivity
Аннотация: The effect of the intersite Coulomb interaction of fermions on the ground state and energy structure of high-temperature superconductors is considered within the three-band Emery model using an extended basis of the irreducible operators orthogonal on Mori. The proposed theory allows prediction of bands of the fluctuation states whose spectral intensity grows with an increase in the root-mean-square fluctuations of the occupation numbers. The increase in these fluctuations in high-temperature superconductors upon doping plays a key role in redistribution of the integrated density of the Fermi states.

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[Val'kov, V. V.
Korovushkin, M. M.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович; Russian Academy of Sciences; Russian Foundation for Basic Research [07-02-00226]; RAS; Dynasty Foundation
}
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16.

Experimental and DFT study of BaLaCuS3: Direct band gap semiconductor / A. S. Oreshonkov, N. O. Azarapin, N. P. Shestakov, S. V. Adichtchev // J. Phys. Chem. Solids. - 2021. - Vol. 148. - Ст. 109670, DOI 10.1016/j.jpcs.2020.109670. - Cited References: 26. - The reported study was funded by RFBR , project numbers: 18-03-00750 , 18-05-00682 and 18-32-20011 . The authors would like to thank Alexey A. Lubin for his studies on SEM. The studies were carried out on the basis of a laboratory of electron and probe microscopy in REC ‘Nanotechnologies’. We are grateful to the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center « Krasnoyarsk Science Center SB RAS » for the provided Bruker Vertex 80v. The experimental part corresponding to Raman measurements was supported by the Ministry of Education and Science of the Russian Federation, grant no AAAA-A17-117052410033-9 . - ISSN 0022-3697
Кл.слова (ненормированные):
Sulphidation -- Semiconductor -- Direct band gap -- Wide band gap -- Solar cell
Аннотация: BaLaCuS3 powder was prepared by sulphidation method. The shape of powder particles is irregular and place in the range of 10–100 μm. The electronic, elastic and vibrational properties were evaluated with the use of DFT method. According to the electronic band structure calculation the BaLaCuS3 is a direct wide band gap semiconductor with Edg = 2.0 eV while the energy of indirect transition is equal to 2.2. eV and it indicates that the BaLaCuS3 is a promising material for efficient underwater solar cells. Calculated compressibility of BaLaCuS3 is found to be identical to germanium and zinc blende modification of zunc sulfide.

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Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
School of Engineering and Construction, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry, Tyumen State University, Tyumen, 625003, Russian Federation
Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Azarapin, N. O.; Shestakov, N. P.; Шестаков, Николай Петрович; Adichtchev, S. V.
}
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17.

Extremely large magnetoresistance induced by optical irradiation in the Fe/SiO2/p-Si hybrid structure with Schottky barrier / N. V. Volkov [et al.] // J. Appl. Phys. - 2013. - Vol. 114, Is. 9. - Ст. 093903. - P. , DOI 10.1063/1.4819975. - Cited References: 31. - This study was supported by the Russian Foundation for Basic Research, Project No. 11-02-00367-a; Presidium of the Russian Academy of Sciences, program Quantum Mesoscopic and Disordered Structures, Project No. 20.8; the Division of Physical Sciences of the Russian Academy of Sciences, program Spin Phenomena in Solids Nanostructures and Spintronics, Project No. II.4.3; the Siberian Branch of the Russian Academy of Sciences, integration projects nos. 43, 85 and 102; Project of the Russian Ministry of Education and Science N 02.G25.31.0043. . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
SPIN POLARIZATION
SPINTRONICS
SILICON
Аннотация: We report giant magnetoresistance (MR) effect that appears under the influence of optical radiation in common planar device built on Fe/SiO2/p-Si hybrid structure. Our device is made of two Schottky diodes connected to each other by the silicon substrate. Photo-induced MR is positive and the MR ratio reaches the values in excess of 10(4)%. The main peculiarity of the MR behavior is its strong dependence on the magnitude and the sign of the bias current across the device and, most surprisingly, upon polarity of the magnetic field. To explain such unexpected behavior of the MR, one needs to take into account contribution of several physical mechanisms. The main contribution comes from the existence of localized interface states at the SiO2/p-Si interface, which provide the spots for the photo-current conduction by virtue of the sequential tunneling through them or thermal generation and optical excitation of mobile charges. External magnetic field changes the probability of these processes due to its effect on the energy states of the conduction centers. Two possible mechanisms that may be responsible for the observed dependence of magneto-resistance on the field polarity are discussed: the effect of the Lorentz force on moving carriers and spin splitting of electrons moving in the electrostatic potential gradient (Rashba effect). The most significant observation, in our opinion, is that the observed MR effect is seen exclusively in the subsystem of minority carriers transferred into non-equilibrium state by optical excitation. We suggest that building such magneto-sensitive devices based on this mechanism may set a stage for new types of spintronic devices to emerge. (C) 2013 AIP Publishing LLC.

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SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Inst Space Technol, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Tarasov, A. S.; Тарасов, Антон Сергеевич; Eremin, E. V.; Еремин, Евгений Владимирович; Baron, F. A.; Барон, Филипп Алексеевич; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [11-02-00367-a]; Presidium of the Russian Academy of Sciences, program Quantum Mesoscopic and Disordered Structures [20.8]; Division of Physical Sciences of the Russian Academy of Sciences, program Spin Phenomena in Solids Nanostructures and Spintronics [II.4.3]; Siberian Branch of the Russian Academy of Sciences [43, 85, 102]; Russian Ministry of Education and Science [N 02.G25.31.0043]
}
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18.

Deich, L. I.
Far-infrared attenuation in glasses / L. I. Deich // Phys. Rev. B. - 1994. - Vol. 49, Is. 1. - P. 109-113, DOI 10.1103/PhysRevB.49.109. - Cited References: 29 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
VITREOUS SILICA
   TEMPERATURE
   MODEL
   LOCALIZATION
   ABSORPTION
   SOLIDS
   STATES
Аннотация: The influence of quasilocal vibrations on the far-infrared spectra of glasses is investigated under the supposition that the quasilocal vibrations are directly inactive in the attenuation. It is shown that taking into account phonon-quasilocal-vibration coupling and both medium- and short-range structure of the inhomogeneities of a photon-phonon coupling parameter can give rise to an attenuation curve similar to one observed for a-SiO2 and related materials.

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Держатели документа:
L. V. Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Дейч, Лев Исаакович
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19.

Forming a ferrimagnetic-like structure in the PbMn1−xFexBO4 (x ≈ 0.1) single crystal upon partial substitution / A. Pankrats [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 497. - Ст. 165997, DOI 10.1016/j.jmmm.2019.165997. - Cited References: 25. - The authors are grateful to S. Nikitin for help in the specific heat measurements in a magnetic field and S. Martynov for fruitful discussions. This study was funded by RFBR and the Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science , to the research project no. 18-42-240008 “Effect of Magnetic Structure on the Magnetodielectric Properties of Oxide Crystals Containing Stereoactive Ions Pb 2+ and Bi 3+”. . - ISSN 0304-8853
Кл.слова (ненормированные):
Crystal structure -- Ferrimagnetism -- Ferromagnetic materials -- Ferromagnetic resonance -- Ferromagnetism -- Iron -- Magnetic anisotropy -- Magnetic moments -- Manganese -- Metal ions -- Single crystals -- Specific heat of solids
Аннотация: The PbMn1−xFexBO4 (x ≈ 0.1) orthoborate single crystals have been grown for the first time by spontaneous crystallization and their magnetic and resonance properties and specific heat have been examined. It has been established that partial substitution of iron ions for manganese ones leads to an increase in the Curie temperature to 34.2 K from its value of 30.3 K in the unsubstituted crystal, enhances the magnetic anisotropy, and reduces the saturation magnetization. The magnetization drop is explained in the framework of the model of a ferrimagnetic-like structure, in which the magnetic moments of iron and manganese ions form ferromagnetic subsystems coupled by the antiferromagnetic exchange. It has been found that under magnetization along the rhombic b axis the magnetic moments switch stepwise to the magnetic field direction in a certain critical field. The spin-reorientation transition is the first-order one. This feature of the crystal magnetization does not allow the experimental ferromagnetic resonance frequency-field dependence for the rhombic b axis to be described using the calculation for a simple rhombic ferromagnet. It has been established that the increase in the magnetic anisotropy of the crystal upon substitution leads to an increase in the energy gap in the ferromagnetic resonance spectrum to 121.5 GHz at T = 4.2 K.

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Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Kolkov, M. I.; Колков, Максим Игоревич; Balaev, A. D.; Балаев, Александр Дмитриевич; Shabanov, A. V.; Шабанов, Александр Васильевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич
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20.

Heat capacity and thermal expansion of nanosized ferroelectric (NH4)2SO4 embedded in borosilicate glasses / E. A. Mikhaleva, M. V. Gorev, V. S. Bondarev [et al.] // J. Non-Cryst. Solids. - 2022. - Vol. 597. - Ст. 121935, DOI 10.1016/j.jnoncrysol.2022.121935. - Cited References: 29. - The authors are grateful to Dr. Ewa Rysiakiewicz-Pasek (Wroclaw University of Science and Technology, Poland) for the preparation and characterization of borosilicate glasses. X-ray and dilatometric data were obtained using the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 0022-3093
Кл.слова (ненормированные):
Nanocomposite -- Ferroelectrics -- Phase transition -- Thermal expansion -- Entropy
Аннотация: The thermal properties of nanocomposites obtained by incorporating a ferroelectric (NH4)2SO4 (AS) into porous glasses (PG) was studied for the first time. X-ray diffraction studies showed a strong increase in the ratio of the size of nanocrystallites grown in glass matrices to pore size, dcryst/ dpore = 0.47→1.50→5.00, with a decrease in dpore = 320→46→7 nm. Calorimetric and dilatometric measurements showed a change from a first-order phase transition in AS single crystal to a second-order transformation in AS nanocrystallites. A restricted geometry also led to a significant decrease in the anomalous entropy in AS+PG samples compared to AS (J/mol∙K): 17.7 (AS)→12.4 (AS+PG320)→10.4 (AS+PG46)→8.1 (AS+PG7). A discussion of the nontrivial behavior of the phase transition temperature in embedded AS was carried out using the degree of PG filling, the ratio dcryst/dpore, texture, and the volumetric and linear baric coefficients for the bulk AS.

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Держатели документа:
Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660074, Russian Federation
Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Ioffe Physico-Technical Institute, RAS, St.-Petersburg, 194021, Russian Federation

Доп.точки доступа:
Mikhaleva, E. A.; Михалева, Екатерина Андреевна; Gorev, M. V.; Горев, Михаил Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zaitsev, A. I.; Зайцев, Александр Иванович; Nemtsev, I. V.; Fokin, A. V.; Flerov, I. N.; Флёров, Игорь Николаевич
}
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