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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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Держатели документа:
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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Mixed-valence hydrated iron fluoridotitanate: synthesis, optics and calorimetry / S. V. Mel'nikova, N. M. Laptash, M. V. Gorev, E. I. Pogoreltsev // J. Phys. Chem. Solids. - 2020. - Vol. 142. - Ст. 109444, DOI 10.1016/j.jpcs.2020.109444. - Cited References: 35 . - ISSN 0022-3697
Кл.слова (ненормированные):
Crystal growth -- Fluoridotitanate -- Mixed valence -- Phase transition -- Optical properties -- Heat capacity
Аннотация: Mixed-valence hydrated fluoridotitanate with idealized formula FeTiF6·6H2O is the main product of fluoride processing of natural mineral ilmenite with hydrofluoric acid. Its single crystals were grown and optical and calorimetric experiments were carried out in the temperature range 200–350 K. Charge re-distribution, Fe2+Ti4+ to Fe3+Ti3+, in the compound studied was evident in XPS spectra. A first order ferroelastic phase transition occurs at temperatures T0↓ = 271.5 K, T0↑ = 274 ÷ 275.5 K with the symmetry change P3‾↔ P1‾. The structural transformation is accompanied by the appearance of a very weak optical anisotropy in the slice (001), a small anomaly of the heat capacity (ΔS = 1.5 J/mol K = 0.2R), and positive baric coefficients dT0/dp ≈ 30 ± 10 K/GPa.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation
Siberian Federal University, Krasnoyarsk, 660074, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Laptash, N. M.; Gorev, M. V.; Горев, Михаил Васильевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич
}
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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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    Magnetic properties of ludwigite Mn2.25Co0.75BO5 / D. V. Popov, T. P. Gavrilova, I. F. Gilmutdinov [et al.] // J. Phys. Chem. Solids. - 2021. - Vol. 148. - Ст. 109695, DOI 10.1016/j.jpcs.2020.109695. - Cited References: 36. - This research was supported by the RFBR (project no. 17-02-00953 ). T. P. G., R. M. E., V. A. Sh. acknowledge the financial support from the government assignment for FRC Kazan Scientific Center of RAS . The magnetic measurements were carried out at the Federal Center of Shared Facilities of Kazan Federal University . - ISSN 0022-3697
   Перевод заглавия: Магнитные свойства людвигита Mn2.25Co0.75BO5
Кл.слова (ненормированные):
Ludwigite -- Phase transition -- Magnetization -- Specific heat
Аннотация: Needle-shape single crystals of Mn2.25Co0.75BO5 ludwigite were synthesized by the flux technique and investigated by means of X-ray diffraction, static magnetic susceptibility and specific heat measurements. Magnetization and specific heat experiments showed the presence of ferrimagnetic ordering near TN≃61K. Below this temperature the magnetic properties demonstrated the angular dependence and the high magnetic hardness in a magnetic field applied perpendicular to the crystallographic c axis, which is similar to other cobalt-containing ludwigites. The effective magnetic moment per magnetic ion 4.8μB was calculated from the paramagnetic data. Analysis of the phonon contribution to the specific heat allowed to distinguish the magnetic contribution CM, which has two features. One of which was observed at TN and can be attributed to strong exchange interactions between spins of magnetic ions. The second one at T = 11.6 K is due to the effect of the ligands crystal field on a magnetic ion with S›1/2.

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Kazan (Volga Region) Federal University, Kremlevskaya st., 18, Kazan, 420008, Russian Federation
Zavoisky Physical-Technical Institute, Federal Research Center “Kazan Scientific Center of RAS”, Sibirsky tract, 10/7, Kazan, 420029, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Popov, D. V.; Gavrilova, T. P.; Gilmutdinov, I. F.; Cherosov, M. A.; Shustov, V. A.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremina, R. M.
}
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Local electric-field effects and 2nd-harmonic generation in langmuir-blodgett-films / A. N. Botvich, M. P. Shkuryaev, A. N. Vtyurin // Molecular crystals and liquid crystals science and technology : section A- Molecular crystals and liquid crystals. - 1993. - Vol. 230. - P. 259-264. - Cited References: 8 . - ISSN 0140-6566
Аннотация: Local electric field of light waves in Langmuir-Blodgett film is calculated, and its effect on optical second harmonic generation (SHG) is estimated. Strong dependence of SHG intensity on the film thickness is explained.

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Держатели документа:
KRASNOYARSK UNIV,KRASNOYARSK 660036,RUSSIA
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН

Доп.точки доступа:
Botvich, A. N.; Ботвич, Александр Николаевич; Shkuryaev, M. P.; Шкуряев, М. П.; Vtyurin, A. N.; Втюрин, Александр Николаевич; International conference on electrical and related properties of organic solids(6 ; 1992 ; May 18-22 ; Capri, Italy)
}
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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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    Zobov, V. E.
    Reversible and Irreversible propagation of quantum information and its manifestation in multiple-quantum NMR spectra in solids / V. E. Zobov, A. A. Lundin // J. Exp. Theor. Phys. - 2020. - Vol. 131, Is. 2. - P. 273-279, DOI 10.1134/S1063776120060096. - Cited References: 33. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the State Task 0082-2019-0001 (State Registration Number AAAA-A19-119012890064-7) . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
DYNAMICS
   LOCALIZATION
   SIMULATIONS
   COHERENCES
Аннотация: On the basis of the earlier developed statistical theory of the growth of the effective size of correlated clusters (the number of correlated spins), an expression for the shape of the multiple-quantum (MQ) NMR spectrum is obtained that takes into account the loss of coherence in a spin system due, for example, to the controlled intervention of the experimenter. It is shown that the scrambling and decoherence processes in the MQ spectrum of the multiparticle system of a solid are not separated, unlike the corresponding spectra of some large isolated molecules [27] in a solution. The relations obtained allow one to extract the necessary information about the above processes (scrambling and decoherence) from the dependence of the MQ spectra on experimental parameters.

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Публикация на русском языке Зобов, Владимир Евгеньевич. Обратимое и необратимое распространение квантовой информации и проявление его в спектрах многоквантового ЯМР в твердом теле [Текст] / В. Е. Зобов, А. А. Лундин // Журн. эксперим. и теор. физ. - 2020. - Т. 158 Вып. 2. - С. 300-308

Держатели документа:
RAS, Fed Res Ctr, Kirensky Inst Phys, KSC,SB, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Semenov Inst Chem Phys, Moscow 117977, Russia.

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич; Ministry of Science and Higher Education of the Russian Federation [0082-2019-0001, AAAA-A19-119012890064-7]
}
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Lundin, A. A.
Multiple-quantum NMR spectroscopy and quantum information delocalization in solids in the presence of magnetic fields inhomogeneities / A. A. Lundin, V. E. Zobov // International Conference “Magnetic Resonance – Current State and Future Perspectives” (EPR-75) : book of abstracts. - Kazan, 2019. - P. 30. - Cited References: 5

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Держатели документа:
N.N. Semenov Institute of Chemical Physics, RAS
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Zobov, V. E.; Зобов, Владимир Евгеньевич; Лундин, Андрей Арнольдович; "Magnetic Resonance - Current State and Future Perspectives", International Conference(2019 ; Sept. ; 23-27 ; Kazan, Russia); Казанский (Приволжский) федеральный университет; Казанский физико-технический институт им. Е. К. Завойского Казанского научного центра РАН
}
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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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10.

Stability of the superconducting d-wave pairing towards the Coulomb repulsions in cuprate superconductors / V. V. Val'kov [и др.] // VI International symposium on strong nonlinear vibronic and electronic interactions in solids : book of abstracts . - 2018. - P. 33

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Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; International symposium on strong nonlinear vibronic and electronic interactions in solids(6 ; 2018 ; April 28-May 1 ; Tartu, Estonia)
}
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11.

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

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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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12.

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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13.

    Oreshonkov, A. S.
    New candidate to reach Shockley–Queisser limit: The DFT study of orthorhombic silicon allotrope Si(oP32) / A. S. Oreshonkov, E. M. Roginskii, V. V. Atuchin // J. Phys. Chem. Solids. - 2020. - Vol. 137. - Ст. 109219, DOI 10.1016/j.jpcs.2019.109219. - Cited References: 44. - The authors are grateful for the support from RFBR , according to the research projects 18-03-00750 and 18-32-20011 . The computations were performed using the facilities of the Computational Center of the Research Park of St. Petersburg State University. This study was also supported by the Russian Science Foundation (project 19-42-02003 , in part of conceptualization). . - ISSN 0022-3697
   Перевод заглавия: Новый кандидат для достижения предела Шокли-Квайссера: ДФТ исследование орторомбического аллотропа кремния Si(oP32)
Кл.слова (ненормированные):
Silicon -- Allotrope -- Shockley–Queisser limit -- DFT -- Phonon
Аннотация: In the present study, the unit cell parameters and atomic coordinates are predicted for the Pbcm orthorhombic structure of Si(oP32) modification. This new allotrope of silicon is mechanically stable and stable with respect to the phonon states. The electronic structure of Si(oP32) is calculated for LDA and HSE06 optimized structures. The band gap value Eg = 1.361 eV predicted for Si(oP32) is extremely close to the Shockley–Queisser limit and it indicates that the Si(oP32) modification is a promising material for efficient solar cells. The frequencies of Raman and Infrared active vibrations is calculated for allotrope Si(oP32).

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Держатели документа:
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Laboratory of Spectroscopy of Solid State, Ioffe Institute, St. Petersburg, 194021, Russian Federation
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk, 630090, Russian Federation
Functional Electronics Laboratory, Tomsk State University, Tomsk, 634050, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovom, 650000, Russian Federation

Доп.точки доступа:
Roginskii, E. M.; Atuchin, V. V.; Орешонков, Александр Сергеевич
}
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14.

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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Держатели документа:
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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15.

The role of strong electron correlations in determination of band structure and charge distribution of transition metal dihalide monolayers / E. A. Kovaleva [et al.] // J. Phys. Chem. Solids. - 2019. - Vol. 134. - P. 324-332, DOI 10.1016/j.jpcs.2019.05.036. - Cited References: 44. - This work was supported by the government contract of the Ministry of Education and Science of the Russian Federation, Russia to Siberian Federal University (Grant No. 16.1455.2017/PCh ) and Russian Foundation for Basic Research (RFBR), Russia (Grant No. 16-32-60003 mol_a_dk), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: “Quantum chemical modeling of Bychkov-Rashba interfaces based on transition metal compounds and nanoscaled organic fragments” (Project No. 18-43-243011). The authors would like to thank Joint Supercomputer Center of RAS , Moscow; Center of Equipment for Joint Use of Siberian Federal University , Krasnoyarsk; and Information Technology Center, Novosibirsk State University for providing the access to their supercomputers. N.S.M. acknowledges the financial support of the RFBR , through the research project No. 16-32-60003 mol_a_dk. E.A. Kovaleva is grateful to the Foundation for Assistance to Small Innovative Enterprises (FASIE), Russia (Project no. 0033639 ). W.B. and P.A. gratefully acknowledge the financial support of National Research Foundation of Republic of Korea under the Grant No. NRF-2017R1A2B4004440. . - ISSN 0022-3697
Кл.слова (ненормированные):
Transition metal dihalides -- Monolayers -- DFT -- Hubbard correction -- Band structure
Аннотация: Electronic structure and magnetic properties of the family of first-row transition metal dihalides (TMHal2, TM = V, Cr, Mn, Fe, Co, Ni; H = Br, I) monolayers were studied by means of density functional theory. Strong electron correlations were taken into account by implementing Hubbard U correction in a simplified scheme proposed by Dudarev et al. (Ueff). Ueff correction essentially affects electronic structure of TMHal2 widening the band gap and witnessing their highly spin-polarized nature. Two different ligand orientations namely, H and T configurations of monolayers were considered. Unlike others, FeHal2 monolayers tend to form H structure when Ueff correction is included. © 2019 Elsevier Ltd

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Держатели документа:
Siberian Federal University, 79 Svobodny Pr., Krasnoyarsk, 660041, Russian Federation
Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, South Korea
Kirensky Institute of Physics, FRC KSC SB RAS, 50 Academgorodok, Krasnoyarsk660036, Russian Federation
Tomsk State University, 36 Lenin Prospekt, Tomsk, 634050, Russian Federation

Доп.точки доступа:
Kovaleva, E. A.; Melchakova, I.; Mikhaleva, N. S.; Tomilin, F. N.; Томилин, Феликс Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Baek, W.; Pomogaev, V. A.; Avramov, P. V.; Аврамов, Павел Вениаминович; Kuzubov, A. A.
}
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16.

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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17.

Local structure and electronic confi guration in Mn and Fe doped glasses [Text] / Marie-Louise Saboungi, Louis Hennet [et al.] // 12th International Conference on the Physics of Non-Crystalline Solids (PNCS12) : September 6–9, 2009, Foz do Iguaçu, PR, Brazil. - 2009. - P19-20

Доп.точки доступа:
Saboungi, Marie-Louise; Hennet, Louis; Zabluda, Vladimir; Edelman, Irina; Thiaudiиre, Dominique; Kliava, Janis; International Conference on the Physics of Non-Crystalline Solids(12 ; 2009 ; SEP ; Foz do Iguaçu, PR, Brazil)
}
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18.

Magneto-Optical Properties and Clustering of Dy3+ ions in Oxide Glasses [Text] / Alexander Malakhovskii, Alexander Sukhachev [et al.] // 12th International Conference on the Physics of Non-Crystalline Solids (PNCS12) : September 6–9, 2009, Foz do Iguaçu, PR, Brazil. - 2009. - P105

Доп.точки доступа:
Malakhovskii, Alexander; Sukhachev, Alexander; Zabluda, Vladimir; Edelman, Irina; International Conference on the Physics of Non-Crystalline Solids(12 ; 2009 ; SEP ; Foz do Iguaçu, PR, Brazil)
}
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19.

Magnetic resonance properties of low-dimensional cobalt – Al2O3-germanium tunnel contacts / A. V. Kobyakov, G. S. Patrin, V. I. Yushkov [et al.] // Magn. Reson. Solids. - 2022. - Vol. 24, Is. 2. - Ст. 22201, DOI 10.26907/mrsej-22201. - Cited References: 12. - The work was carried out in the process of fulfilling the state task of the Ministry of Science and Higher Education of the Russian Federation No. FSRZ-2020-0011 "Synthesis and physical foundations of nanoscale film and granular composite materials for spintronics devices" . - ISSN 2072-5981
Кл.слова (ненормированные):
magnetic resonance -- multilayer magnetic films -- nanostructures -- tunnel effect
Аннотация: The magnetic resonance properties of a low-dimensional cobalt-Al2O3-germanium tunnel contact are studied in this work. The appearance of minima observed at low temperatures on both sides of the cobalt layer was found on the thermomagnetic curve. The value of the temperature minimum differs in magnitude on both sides of the cobalt layer. The position of the minimum in the temperature dependence of magnetization depends on the sample preparation technology. As a result of layer growth, at least two magnetic phases appear. One contribution is from the spins of ferromagnetic particles (cobalt particles with a hexagonal close packed lattice), and additional contributions from the magnetically disordered phase of fine cobalt particles and Co-Al2O3 compounds.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Achinsk Branch of Krasnoyarsk State Agrarian University, Achinsk, 662100, Russian Federation

Доп.точки доступа:
Kobyakov, A. V.; Кобяков, Александр Васильевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Yushkov, V. I.; Юшков, Василий Иванович; Shiyan, Ya. G.; Шиян, Ярослав Германович; Rudenko, R. Yu.; Kosyrev, N. N.; Косырев, Николай Николаевич; Zharkov, S. M.; Жарков, Сергей Михайлович
}
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20.

Bulgakov, E. N.
Optical coupled-mode theory for dielectric solids of revolution / E. N. Bulgakov, D. N. Maksimov, A. E. Ershov // Phys. Rev. A. - 2023. - Vol. 107, Is. 4. - Ст. 043506, DOI 10.1103/PhysRevA.107.043506. - Cited References: 33. - This work received financial support through Russian Science Foundation Grant No. 22-72-00102 . - ISSN 2469-9926. - ISSN 2469-9934
Аннотация: We propose a single resonance coupled-mode approach to light scattering by dielectric solids of revolution. By using a biorthogonal decomposition of the S matrix found with the extended boundary condition method we derived all parameters required for application of the temporal coupled-mode theory in a closed form. The proposed approach allows for constructing a frequency-dependent Fano response due to a single resonance after the full-wave solution has been found at a single incident frequency.

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Держатели документа:
Institute of Computational Modeling SB RAS, Krasnoyarsk 660036, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
IRC SQC, Siberian Federal University, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Ershov, A. E.; Булгаков, Евгений Николаевич
}
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