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Normal and superconducting properties of cuprates in strong electron correlation regime / Ovchinnikov S.G.Gavrichkov V.A. [et al.] // Третья международная конференция "Фундаментальные проблемы высокотемпературной сверхпроводимости" ФПС'08 = The 3rd International Conference "Fundamental Problems of High Temperature Superconductivity" FPS'08 : 13-17 окт., Звенигород, 2008 : сборник трудов. - С. 10

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Shneyder, E. I.; Шнейдер, Елена Игоревна; Korshunov, M. M.; Коршунов, Максим Михайлович; "Фундаментальные проблемы высокотемпературной сверхпроводимости", международная конференция(3 ; 2008 ; окт. ; Звенигород)
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The interplay of phonon and magnetic mechanism of pairing in strongly correlated electron system of high-Tc cuprates / S. G. Ovchinnikov, E. I. Shneyder // Seventh International Conference on New Theoreties, Discoveries & Applications of Superconductors and Related Materials and Zhongguancun International Consortium of R&D of Superconductivity Technology Inaugurating Meeting : May 13-16, 2009, Beijing, China. - Ст. S1E0900

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; International Conference on New Theoreties, Discoveries & Applications of Superconductors and Related Materials(17 ; 2009 ; MAY ; Beijing, China); Zhongguancun International Consortium of R&D of Superconductivity Technology Inaugurating Meeting(2009 ; MAY ; Beijing, China)
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Distribution of cobalt Co2+ ions in single crystals of spinel Li0.5Ga2.5O4 / V. V. Shapovalov, V. A. Shapovalov, T. V. Drokina [et al.] // Phys. Met. Metallogr. - 2024. - Vol. 125, Is. 1. - P. 27-32, DOI 10.1134/S0031918X23602883. - Cited References: 22 . - ISSN 0031-918X. - ISSN 1555-6190
Кл.слова (ненормированные):
electron paramagnetic resonance -- spinel single crystal -- unit cell -- crystal lattice -- structurally nonequivalent positions of ions
Аннотация: The distribution of Co2+ ions over sublattices and structurally nonequivalent positions in the unit cell of the crystal lattice of a single crystal of lithium gallium spinel Li0.5Ga2.5O4 is shown. This distribution determines the properties of both mono- and nanocrystalline substances. The distribution is obtained by a special technology and is manifested in the electron paramagnetic resonance (EPR) spectra. The distribution of Co2+ ions depends on the structural and magnetic nonequivalence. The structural and magnetic nonequivalence causes a multiminimum behavior of the crystal field potential in the unit cells of single crystals at the locations of Co2+ ions. The Co2+ ions are found in complexes with tetrahedral and octahedral oxygen ions. Three types of EPR spectra of Co2+ ions have been found and investigated. The Cotetr2+ spectrum is attributed to the Co2+ ion, which replaces the Ga3+ ion located in a tetrahedral oxygen environment. The spectrum of the Cooct2+ ion located in the crystal field with axial symmetry belongs to the Co2+ ion replacing the Li+ ion located in an octahedral oxygen environment. The spectrum of the Cooct2+ ion located in a low symmetry crystal field belongs to the Co2+ ion replacing the Ga3+ ion located in an octahedral oxygen environment. The nearest cationic environment of the ion creates rhombic distortions due to the different valence numbers of Li+ and Ga3+. The results of studying the angular dependences of the spectra show the presence of four and twelve magnetically nonequivalent positions in the unit cells.

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Держатели документа:
Math for America (MfA), New York, USA
Galkin Donetsk Institute of Physics and Engineering, 283048, Donetsk, Russia
Kirenskii Institute of Physics, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Shapovalov, V. V.; Shapovalov, V. A.; Drokina, T. V.; Дрокина, Тамара Васильевна; Vorotynov, A. M.; Воротынов, Александр Михайлович; Val'kov, V. I.; Вальков, В. И.
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Modification of synthetic valleriite surface with gold nanoparticles: The roles of specific adsorption and zeta potential / A. A. Karacharov, M. N. Likhatski, R. V. Borisov [et al.] // Colloid J. - 2024. - Vol. 86, Is. 1. - P. 40-51, DOI 10.1134/S1061933X23601075. - Cited References: 69. - This work was supported by the Russian Science Foundation project no. 22-13-00321 . - ISSN 1061-933X. - ISSN 1608-3067
Кл.слова (ненормированные):
synthetic valleriites -- gold nanoparticles -- X-ray photoelectron spectroscopy -- transmission electron microscopy -- zeta potential
Аннотация: Layered two-dimensional materials, whose properties dramatically differ from their bulk precursors, are of great theoretical and applied importance. Recently, a layered 2D material, an analog of a natural mineral, valleriite, in which quasi-monoatomic Cu−Fe−S sheets alternate with brucite-like ones, has been prepared using a simple hydrothermal synthesis procedure. The features of the electronic structure of these materials make it possible to propose them as new materials for a wide field of applications such as (electro)photocatalysis, high-capacity batteries, etc. In this work, nanocomposite materials have been prepared via immobilization of gold nanoparticles (AuNPs) from citrate hydrosols on the surface of the synthesized valleriites having different compositions of hydroxide layers, which control the surface charge density. According to X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive X-ray microanalysis (EDX), and selected area electron diffraction (SAED) data, AuNPs are immobilized on valleriite nanoflakes, which have lateral sizes of 150–200 nm and thicknesses of several tens of nanometers, as isolated metal nanoparticles with an average diameter of 11 nm. A small amount of aggregates indicates a high affinity of AuNPs for the valleriite surface. The amounts of immobilized gold are the same on all studied valleriites (~0.2%). This finding may be related to the simultaneous sorption of free citrate ions from the AuNP hydrosols, with these ions, according to zeta potential measurements, charging the surfaces of all studied valleriite samples to nearly the same negative value of –40 mV. According to the XPS data, the AuNPs immobilization markedly decreases the magnesium and oxygen contents on the surfaces of the synthesized valleriites due to the partial degradation/dissolution of the brucite layer. In addition, the amount of Fe3+ ions bound to OH groups decreases with a simultaneous increase in the fraction of Fe3+–O species. The TEM data have confirmed the preservation of the layered structure of valleriites after the immobilization of AuNPs.

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Публикация на русском языке Модификация поверхности синтетического валлериита наночастицами золота: роль специфической адсорбции и дзета-потенциала [Текст] / А. А. Карачаров, М. Н. Лихацкий, Р. В. Борисов [и др.]. - 13 с. // Коллоид. журн. - 2024. - Т. 86 № 1. - С. 45-57

Держатели документа:
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”, 660036, Akademgorodok, Krasnoyarsk, Russia
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”, 660036, Akademgorodok, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia

Доп.точки доступа:
Karacharov, A. A.; Likhatski, M. N.; Borisov, R. V.; Tomashevich, E. V.; Vorobyev, S. A.; Zharkov, S. M.; Жарков, Сергей Михайлович
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Synthesis and study of superhigh-concentrated organosols of silver nanoparticles / S. A. Vorobyev, M. Yu. Flerko, S. A. Novikova [et al.] // Colloid J. - 2024. - Vol. 86, Is. 2. - P. 208-217, DOI 10.1134/S1061933X23601294. - Cited References: 33. - The work was carried out with the financial support of the basic project FWES-2021-0014 of the Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, and the Federal Program "Priority 2030" using the equipment of the Krasnoyarsk regional center for collective use of the Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences . - ISSN 1061-933X. - ISSN 1608-3067
Кл.слова (ненормированные):
silver nanoparticles (NPs) -- concentrated silver organosols -- phase transfer of nanoparticles -- X-ray photoelectron spectroscopy (XPS) -- transmission electron microscopy (TEM) -- conductive silver films
Аннотация: Due to their unique properties, organosols of silver nanoparticles are widely used in optical and semiconductor devices, to produce electrically and thermally conductive films, as catalysts, antibacterial materials, etc. This work proposes a simple and highly productive method for the preparation of silver organosols, which have a metal concentration as high as 1800 g/L and contain spherical nanoparticles with low polydispersity and a median size of 9.1 nm. The method consists in the initial preparation of silver nanoparticle hydrosols with a concentration of higher than 30 g/L followed by the transfer of the NPs into an organic phase of o-xylene. A set of physical research methods has been employed to study the regularities of the extraction of silver nanoparticles with o-xylene in the presence of cetyltrimethylammonium bromide (CTAB) and ethanol and to determine the optimal process conditions, under which the extraction degree is as high as 62.5%. It has been found that bromine anions contained in CTAB molecules cause the aggregation of some amount of silver nanoparticles with the formation of silver metal sediment in the aqueous phase. According to X-ray photoelectron spectroscopy data, the sediment contains bromide ions (up to 4 at %) on the particle surface. Organosols synthesized under optimal conditions are stable for more than 7 months and withstand repeated cycles of drying and redispersing. Silver organosols have been used to obtain metal films with an electrical conductivity of about 68 500 S/cm, which increases to 412 000 and 509 500 S/cm (87.8% of the electrical conductivity of bulk silver) after thermal treatment at 150 and 250°C, respectively.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Tomsk National Research State University, 634050, Tomsk, Russia

Доп.точки доступа:
Vorobyev, S. A.; Flerko, M. Yu.; Novikova, S. A.; Mazurova, E. V.; Tomashevich, Ye. V.; Likhatski, M. N.; Saikova, S. V.; Samoilo, A. S.; Zolotovsky, N. A.; Золотовский, Н. А.; Volochaev, M. N.; Волочаев, Михаил Николаевич
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Tamm plasmon polariton-based planar hot-electron photodetector for the near-infrared region / Yu. V. Konov, D. A. Pykhtin, R. G. Bikbaev, I. V. Timofeev // Nanoscale. - 2024, DOI 10.1039/D4NR00710G. - Cited References: 36 . - Article in press. - ISSN 2040-3364. - ISSN 2040-3372
Аннотация: Light-trapping devices have always been a topic of intense interest among researchers. One such device that has gained attention is the hot-electron photodetector with a tunable detection wavelength. Photodetectors based on plasmon nanostructures that provide excitation of surface plasmon polaritons are challenging to manufacture. To address this issue, a planar hot-electron photodetector based on a Tamm plasmon polariton localized in a metal–semiconductor-multilayer mirror structure has been proposed in this study. The parameters and materials of the structure were adjusted to ensure perfect absorption at the resonance wavelength. As a result, the photoresponsivity of the proposed device can reach 42.6 mA W−1 at 905 nm. For the first time, the photosensitivity was calculated analytically by solving the dispersion law for the Tamm plasmon polariton.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Konov, Yu. V.; Конов, Юрий В.; Pykhtin, D. A.; Пыхтин, Дмитрий А.; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Timofeev, I. V.; Тимофеев, Иван Владимирович
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Temperature/component-dependent luminescence in lead-free hybrid metal halides for temperature sensor and anti-counterfeiting / G. Zhou, Y. Wang, Y. Mao [et al.] // Adv. Funct. Mater. - 2024. - Ст. 2401860, DOI 10.1002/adfm.202401860. - Cited References: 89. - G.J.Z. and Y.T.W. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (No.52202177, 22271211), Fundamental Research Program of Shanxi Province (No.20210302124054), Science and Technology Innovation Project of Colleges and Universities in Shanxi Province (No.2021L262), 1331 Project of Shanxi Province, Postgraduate Innovation Project of Shanxi Province (No.2023KY462), and supported by the Ministry of Science and High Education of Russian Federation (No.FSRZ-2023-0006). The authors would like to thank Prof. Haijun Jiao, Leibniz-Institut für Katalyse e.V., Germany, for the theoretical support on the electron-transition mechanism . - Article in press. - ISSN 1616-301X. - ISSN 1616-3028
Кл.слова (ненормированные):
electron-transition -- hybrid metal halides -- optical-functional applications -- self-trapped excitons -- tunable photoluminescence
Аннотация: Hybrid metal halides (HMHs) have emerged as a promising platform for optically functional crystalline materials, but it is extremely challenging to thoroughly elucidate the electron transition coupled to additional ligand emission. Herein, to discover sequences of lead-free HMHs with distinct optically active metal cations are aimed, that is, Sb3+ (5s2) with the lone-pair electron configuration and In3+ (4d10) with the fully-filled electron configuration. (Me2NH2)4MCl6·Cl (Me = −CH3, M = Sb, In) exhibits the superior temperature/component-dependent luminescence behaviors resulting from the competition transition between triplet-states (Tn-S0) self-trapped excitons (STEs) of inorganic units and singlet-state (S1-S0) of organic cations, which is manipulated by the optical activity levels of [SbCl6]3− and [InCl6]3−. The bonding differences between Sb3+/In3+ and Cl− in terms of electronic excitation and hybridization are emphasized, and the different electron-transition mechanisms are established according to the PL spectra at the extreme temperature of 5 to 305 K and theoretical calculations. By fine-tuning the B-site Sb3+/In3+ alloying, the photoluminescence quantum yield (PLQY = 81.5%) and stability are optimized at 20% alloying of Sb3+. This research sheds light on the rules governing PL behaviors of HMHs, as well as exploring the optical-functional application of aviation temperature sensors and access-control systems.

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Держатели документа:
Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
International Research Center of Spectroscopy and Quantum Chemistry-IRC SQC, Siberian Federal University, Krasnoyarsk 660041, Russia
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, P. R. China
College of Chemistry & Chemical Engineering, Key Laboratory of Interface Science and Engineering in Advanced Material, Ministry of Education, Taiyuan University of Technology, Taiyuan, Shanxi 030024, P. R. China

Доп.точки доступа:
Zhou, G.; Wang, Y.; Mao, Y.; Guo, C.; Zhang, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.; Zhang, X.-M.
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Features of the course of the solid-state reactions in a Sn/Fe/Cu trilayer film system / Yu. Yu. Balashov, V. G. Myagkov, L. E. Bykova [et al.] // Tech. Phys. - 2023. - Vol. 68, Is. 7. - P. 940-944, DOI 10.61011/TP.2023.07.56642.73-23. - Cited References: 18 . - ISSN 1063-7842. - ISSN 1090-6525
Кл.слова (ненормированные):
thin films -- transmission electron microscopy -- energy dispersion spectroscopy -- mass transfer mechanisms
Аннотация: Study of the mechanisms of the solid-state reactions in Sn/Fe/Cu thin films is interesting both from a fundamental point of view and from a view of the importance of emerging intermetallics in the technology of solder joints and thin-film lithium-ion batteries. By the integrated approach, including both X-ray phase analysis and local elemental analysis of the cross-sections of the films, the phase composition and the mutual arrangement of phases were studied, at various stages of the solid-state reaction occurring at different temperatures. The observed sequence of the appearing phases differs significantly from the expected one if the mass transfer took place by a volume diffusion through the forming layers.

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Публикация на русском языке Особенности протекания твердофазных реакций в трехслойной пленочной системе Sn/Fe/Cu [Текст] / Ю. Ю. Балашов, В. Г. Мягков, Л. Е. Быкова [и др.]. - 5 с. // Журн. техн. физ. - 2023. - Т. 93 Вып. 7. - С. 1009-1013

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian State University, Krasnoyarsk, Russia

Доп.точки доступа:
Balashov, Yu. Yu.; Балашов, Юрий Юрьевич; Myagkov, V. G.; Мягков, Виктор Григорьевич; Bykova, L. E.; Быкова, Людмила Евгеньевна; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zhigalov, V. S.; Жигалов, Виктор Степанович; Matsynin, A. A.; Мацынин, Алексей Александрович; Galushka, K. A.; Bondarenko, G. N.; Бондаренко, Галина Николаевна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Nanophysics & Nanoelectronics, International Symposium(27 ; 13-16 March 2023 ; Nizhny Novgorod, Russia)
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    Thermokinetic study of intermetallic phase formation in an Al/Cu multilayer thin film system / E. T. Moiseenko, V. V. Yumashev, R. R. Altunin [et al.] // Materialia. - 2023. - Vol. 28. - Ст. 101747, DOI 10.1016/j.mtla.2023.101747. - Cited References: 53. - This work was supported by the Russian Science Foundation under grant # 22-13-00313 . - ISSN 2589-1529
   Перевод заглавия: Термокинетическое исследование образования интерметаллических фаз в многослойной тонкопленочной системе Al/Cu
Кл.слова (ненормированные):
Intermetallics -- Thin film -- Solid-state reaction -- Kinetics -- Differential scanning calorimetry -- Electron diffraction
Аннотация: The solid-state reaction process in a multilayer thin film system (Al/Cu)50 has experimentally been studied using the methods of simultaneous thermal analysis (STA) and in situ electron diffraction. A detailed kinetic analysis of the phase formation processes during the solid-state reaction has shown that the observed solid-state transformations can be described by a statistically significant kinetic model where each stage corresponds to the reaction of the n-th order with autocatalysis. The low-temperature stage has been demonstrated to be attributable to the formation of the θ-Al2Cu phase, with the medium-temperature and high-temperature ones corresponding to the α2-AlCu3 and γ1-Al4Cu9 phases, respectively. The kinetic parameters for the formation of the phases θ-Al2Cu, α2-AlCu3 and γ1-Al4Cu9 have been determined. It has been shown that the kinetic model describing the solid-state reaction in the Al–Cu multilayer thin film system is in best agreement with the experimental data in the case of a competition between the formation stages of the α2-AlCu3 and γ1-Al4Cu9 phases.

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Держатели документа:
Siberian Federal University, 660041 79 Svobodny ave., Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50/24, 660036 Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Moiseenko, E. T.; Yumashev, V. V.; Altunin, R. R.; Solovyov, L. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Belousov, O. V.; Zharkov, S. M.; Жарков, Сергей Михайлович
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10.

Structural and magnetic transitions in the Bi2Fe4O9/BiFeO3 composite / L. V. Udod, S. S. Aplesnin, M. N. Sitnikov [et al.] // J. Alloys Compd. - 2023. - Vol. 958. - Ст. 170445, DOI 10.1016/j.jallcom.2023.170445. - Cited References: 51 . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
Сomposite materials -- Magnetisation -- Optical properties -- Scanning electron microscopy (SEM) -- Ultrasonics -- Phase transitions
Аннотация: A Bi2Fe4O9/BiFeO3 composite with a percentage ratio of 67/33 has been synthesized, its morphological analysis has been carried out. The average crystallite sizes for each phase have been determined. The magnetization hysteresis has been established and the temperature of its disappearance has been found. Using the infrared absorption spectra, temperatures of the magnetic phase transitions in each phase have been determined from the magnetic susceptibility, magnetostriction constant, ultrasound damping coefficient, and phonon mode softening. The change of magnetostriction constant sign observed in the vicinity of the spin reorientation transition and antiferromagnetic transition in mullite has been attributed to the change of the sign of the magnetoelastic constants. The interaction between the phases in the composite and the correlation of its structural and magnetic properties have been established.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Reshetnev Siberian State University of Science and Technology, 660037 Krasnoyarsk, Russia
Siberian Federal University, 660041 Krasnoyarsk, Russia

Доп.точки доступа:
Udod, L. V.; Удод, Любовь Викторовна; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Sitnikov, M. N.; Eremin, E. V.; Еремин, Евгений Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Shabanov, A. V.; Шабанов, Александр Васильевич; Romanova, O. B.; Романова, Оксана Борисовна; Kharkov, A. M.
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