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Contribution of Co3+ ions to the high-temperature magnetic and electrical properties of GdCoO3 / V. A. Dudnikov [et al.] // J. Exp. Theor. Phys. - 2012. - Vol. 114, Is. 5. - P. 841-849, DOI 10.1134/S106377611203003X. - Cited References: 28. - This work was supported by the Ural Branch of the Russian Academy of Sciences and Siberian Branch of the Russian Academy of Sciences (project no. 40), the Russian Foundation for Basic Research (project nos. 09-02-00171-a, 10-02-00251), program 2.3 of the Department of Physical Sciences of Russian Academy of Sciences, and Nonprofit Dinastiya Foundation. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPIN-STATE
   RCOO3 R
   TRANSITIONS
   COBALTITES
   LACOO3
   OXIDES
   SM
   EU
   ND
Аннотация: The temperature dependence of the static magnetization of polycrystalline rare-earth cobaltite GdCoO3 is measured in the temperature range 2-800 K. The magnetic behaviors of GdCoO3 and Gd3+ are found to be different at temperatures above room temperature, which is caused by the appearance of a contribution from Co3+ ions at high temperatures. The temperature dependence of the magnetic susceptibility of GdCoO3 is determined by the magnetization of rare-earth gadolinium ions and the additional paramagnetic contribution induced by the thermally excited magnetic terms of Co3+ ions. The LDA + GTB method is used to calculate the electronic structure of GdCoO3 in the temperature range 0-300 K with allowance for strong electron correlations. The energy spectrum of GdCoO3 is found to have intragap states that decrease the dielectric gap width with increasing temperature.

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Публикация на русском языке Вклад ионов Co3+ в высокотемпературные магнитные и электрические свойства GdCoO3 [Текст] / В. А. Дудников [и др.] // Ж. эксперим. и теор. физ. : Наука, 2012. - Т. 141 Вып. 5. - С. 966-975

Держатели документа:
[Dudnikov, V. A.
Ovchinnikov, S. G.
Orlov, Yu S.
Kazak, N. V.
Patrin, G. S.
Yurkin, G. Yu] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Dudnikov, V. A.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Ovchinnikov, S. G.
Patrin, G. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Michel, C. R.] Univ Guadalajara, Guadalajara 44430, Jalisco, Mexico

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Yu.S.; Орлов, Юрий Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Michel, C. R.; Patrin, G. S.; Патрин, Геннадий Семёнович; Yurkin, G.Yu.; Юркин, Глеб Юрьевич
}
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Physics, Applied
C94

Cuprates, manganites and cobaltites: Multielectron approach to the band structure / M. M. Korshunov [et al.] // Mod. Phys. Lett. B. - 2012. - Vol. 26, Is. 24. - Ст. 1230016, DOI 10.1142/S0217984912300165. - Cited References: 93. - We are thankful to O. K. Andersen, V. I. Anisimov, A. F. Barabanov, K. I. Kikoin, N. M. Plakida, S. Sakai, A.-M.S. Tremblay, V. V. Val'kov, and R. O. Zaitsev for useful discussions. This work was supported by the Presisium of RAS program Quantum physics of condensed matter N 20.7, Grant "Leading scientific schools of Russia" (NSh 1044-2012.2), RFBR (Grant No. 09-02-00127), Integration Grant of SBRAS-UrBRAS N 44, Grant of President of Russia MK-1683.2010.2, FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK 16.740.12.0731 and GK 16.740.11.0740), and Siberian Federal University (Theme N F-11). M.M.K. and E.I.S. acknowledges support from The Dynasty Foundation and ICFPM. . - ISSN 0217-9849

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   MEAN-FIELD THEORY
   DENSITY-FUNCTIONAL FORMALISM
   CORRELATED ELECTRON-SYSTEMS
   TRANSITION-METAL COMPOUNDS
   SPIN-STATE TRANSITION
   T-J MODEL
   MAGNETIC-PROPERTIES
   COPPER OXIDES
   LaCoO3
Кл.слова (ненормированные):
LDA plus GTB method -- strongly-correlated systems -- band structure
Аннотация: High-T-c superconductors with CuO2 layers, manganites La1-xSrxMnO3 and cobaltites LaCoO3 present several mysteries in their physical properties. Most of them are believed to come from the strongly-correlated nature of these materials. From the theoretical viewpoint, there are many hidden rocks in making the consistent description of the band structure and low-energy physics starting from the Fermi-liquid approach. Here, we discuss the alternative method - multielectron approach to the electronic structure calculations for the Mott insulators - called LDA + GTB (local density approximation + generalized tight-binding) method. Its origin is a straightforward generalization of the Hubbard perturbation theory in the atomic limit and the multiband p - d Hamiltonian with the parameters calculated within LDA. We briefly discuss the method and focus on its applications to cuprates, manganites and cobaltites.

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Держатели документа:
[Korshunov, M. M.
Ovchinnikov, S. G.
Shneyder, E. I.
Gavrichkov, V. A.
Orlov, Yu. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Korshunov, M. M.
Ovchinnikov, S. G.
Gavrichkov, V. A.
Orlov, Yu. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Nekrasov, I. A.] Russian Acad Sci, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620219, Russia
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Institute for Electrophysics, Russian Academy of Sciences, Ekaterinburg 620016, Russian Federation
Institute for Metal Physics, Russian Academy of Sciences, Ekaterinburg 620219, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Orlov, Yu.S.; Орлов, Юрий Сергеевич; Nekrasov, I. A.; Pchelkina, Z. V.
}
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Temperature dependence of the spin state of a Co3+ Ion in RCoO3 (R = La, Gd) cobaltites / R. Y. Babkin [et al.] // JETP Letters. - 2014. - Vol. 99, Is. 8. - P. 476-480, DOI 10.1134/S0021364014080037. - Cited References: 16. - This work was supported by the Russian-Ukrainian project no. 27-02-12, by the National Academy of Sciences of Ukraine (complex basic research project no. 91/14-N), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh-2886.2014.2), by the Presidium of the Russian Academy of Sciences (project no. 216), and by the Russian Foundation of the Basic Research (project no. 13-02-00358). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
EFFECTIVE NUCLEAR-CHARGE
TRANSITION
LACOO3
Аннотация: Changes in the spin state of Co3+ ions in LaCoO3 and GdCoO3 compounds are studied through the use of the temperature dependence of the magnetic susceptibility and the modified crystal field theory. It is shown that the spin subsystem of Co3+ ions in LaCoO3 and GdCoO3 undergoes the spin-crossover type transition between the high-spin (S = 2) and low-spin (S = 0) states without any contribution of the intermediate-spin state (S = 1).

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Публикация на русском языке Температурная эволюция спинового состояния иона Co3+ в кобальтитах RCoO3 (R = La, Gd) [Текст] / Р. Ю. Бабкин [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 99 Вып. 7-8. - С. 547-551

Держатели документа:
Natl Acad Sci Ukraine, Donetsk Inst Phys & Engn, UA-83114 Donetsk, Ukraine
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Babkin, R.Yu.; Lamonova, K. V.; Orel, S. M.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Pashkevich, Y. G.; Russian-Ukrainian project [27-02-12]; National Academy of Sciences of Ukraine [91/14-N]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh-2886.2014.2]; Presidium of the Russian Academy of Sciences [216]; Russian Foundation of the Basic Research [13-02-00358]
}
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Concentration dependence of the spin gap in solid solutions La1−xGdxCoO3−δ / S. G. Ovchinnikov [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 383. - P. 162-165, DOI 10.1016/j.jmmm.2014.11.083. - Cited References:20. - This work is supported by Siberian Branch of Russian Academy of Sciences (Projects no. 38), RFBR Grants nos. 13-02-00358, 13-02-00958, 13-02-01395, 14-02-31051, and 14-02-00186, and President of Russia Grant no. NSh-2886.2014.2. . - ISSN 0304

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
STATE TRANSITION
   TEMPERATURE
   LACOO3
   GDCOO3
   COBALTITES
Кл.слова (ненормированные):
Strong correlated electron systems -- Spin crossover systems -- Magnetic -- properties -- Solid solutions
Аннотация: The temperature dependence of the static magnetization of polycrystalline rare-earth cobaltites La1−xGdxCoO3−δ (x=0.2, 0.5, 1) was measured in a wide temperature range up to 900 K. The contribution from Co3+ ions at high temperatures to the magnetic susceptibility was obtained. The Birch–Murnaghan equation and the magnetic date were used to determine the spin gap Δ S as the difference between the energies of high-spin and low-spin states in these compounds.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Vereschagin, S. N.; Perov, N. S.; Siberian Branch of Russian Academy of Sciences [38]; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)
}
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Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO3–δ / S. G. Ovchinnikov [et al.] // JETP Letters. - 2016. - Vol. 103, Is. 3. - P. 161-166, DOI 10.1134/S0021364016030115. - Cited References:40. - This work was supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh-2886.2014.2), by the Presidium of Russian Academy of Sciences (Program 34), by the Russian Foundation for Basic Research (project nos. 16-02-00507, 16-02-00273, 16-02-00098, and 14-02-00186), and by Internationale Buro, Bundesministerium fur Bildung und Forschung (BMBF, grant no. 05K12GU2). . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
TRANSITION-METAL COMPOUNDS
   TOTAL-ENERGY CALCULATIONS
   AUGMENTED-WAVE METHOD
   ELECTRONIC-STRUCTURE
   MAGNETIC-PROPERTIES
   SPIN TRANSITION
   BAND-GAPS
   BASIS-SET
   LaCoO3
   OXIDES
Аннотация: The GdCoO3–δ perovskite is a semiconductor with the energy gap Eg ≈ 0.5 eV from electrical transport measurements. It reveals unusual optical absorption spectra without transparency window expected for semiconductors. Instead we have measured the narrow transmittance peak at the photon energy ε0 = 0.087 eV. To reconcile the transport and optical data we have studied the effect of oxygen vacancies on the electronic structure of the GdCoO3–δ. We have found that oxygen vacancies result in the in-gap states inside the charge-transfer energy gap of the GdCoO3. It is a multielectron effect due to strong electron correlations forming the electronic structure of the GdCoO3–δ. These in-gap states decrease the transparency window and result in a narrow absorption minimum. The predicted temperature dependence of the absorption spectra has been confirmed by our measurements.

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Публикация "на русском языке" Giant red shift of the absorption spectra due to nonstoichiometry in GdCoO3–δ [Текст] / S. G. Ovchinnikov [и др.] // Письма в Журн. эксперим. и теор. физ. : Наука, 2016. - Т. 103 Вып. 3-4. - С. 177-183

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Siberian State Technol Univ, Krasnoyarsk 660049, Russia.

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Kuzubov, A. A.; Кузубов, Александр Александрович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Sokolov, A. E.; Соколов, Алексей Эдуардович; Zabluda, V. N.; Заблуда, Владимир Николаевич; Naumov, S. B.; Shestakov, N. P.; Шестаков, Николай Петрович; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh-2886.2014.2]; Presidium of Russian Academy of Sciences [34]; Russian Foundation for Basic Research [16-02-00507, 16-02-00273, 16-02-00098, 14-02-00186]; Internationale Buro, Bundesministerium fur Bildung und Forschung (BMBF) [05K12GU2]
}
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The magnetoelastic effect in CoxMn1-xS solid solutions / S. S. Aplesnin [et al.] // Solid State Commun. - 2010. - Vol. 150, Is. 13-14. - P. 564-567, DOI 10.1016/j.ssc.2010.01.009. - Cited References: 13. - This work was supported by the Russian Foundation for Basic Research projects no. 08-02-00364-a, no. 08-02-90031, no. F08037, F08-229, and no. 09-02-00554-a. . - ISSN 0038-1098

РУБ Physics, Condensed Matter
Рубрики:
YVO3 SINGLE-CRYSTAL
   SPIN-STATE
   TRANSITION
   TRANSPORT
   PHYSICS
   LACOO3
Кл.слова (ненормированные):
Semiconductors -- X-ray scattering -- Galvanomagnetic effects -- Thermal expansion -- Semiconductors -- X-ray scattering -- Galvanomagnetic effects -- Thermal expansion -- Semiconductors -- X-ray scattering -- Coefficient of thermal expansion -- Magnetoelastic effects -- Orbital ordering -- Temperature hysteresis -- Temperature range -- Zero magnetic fields -- Crystallization -- Electric resistance -- Magnetic field effects -- Magnetoresistance -- Manganese -- Manganese compounds -- Neon -- Organic polymers -- Scattering -- Semiconductor quantum dots -- Solid solutions -- Solidification -- Thermal stress -- X ray scattering -- Thermal expansion
Аннотация: The magnetization of cation-substituted CoxMn(1-x)S sulfides upon cooling in zero magnetic field and in a field in the temperature range 4-300 K has been measured and the resistance versus magnetic field (up to 10 kOe) dependences have been obtained. Magnetoresistance and temperature hysteresis of magnetization versus prehistory are found at the magnetic field H < 0.1 T and at T < 240 K. The interrelation between the magnetic and elastic subsystems of the CoxMn1-xS solid solutions has been established. A jump in the coefficient of thermal expansion is observed at the Neel temperature. The features of the physical properties are explained by orbital ordering. (C) 2010 Elsevier Ltd. All rights reserved.

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Держатели документа:
[Aplesnin, S. S.
Ryabinkina, L. I.
Romanova, O. B.
Har'kov, A. M.] MF Reshetneva Aircosm Siberian State Univ, Krasnoyarsk 660014, Russia
[Gorev, M. V.
Balaev, A. D.
Eremin, E. V.
Bovina, A. F.] Russian Acad Sci, KSC Siberian Branch, Ctr Shared, Krasnoyarsk 660036, Russia
КНЦ СО РАН
M.F. Reshetneva Aircosmic Siberian State University, Krasnoyarsk, 660014, Russian Federation
Center of shared using KSC Siberian branch, Russian Academy Science, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Romanova, O. B.; Романова, Оксана Борисовна; Har'kov, A. M.; Gorev, M. V.; Горев, Михаил Васильевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Eremin, E. V.; Еремин, Евгений Владимирович; Bovina, A. F.; Бовина, Ася Федоровна
}
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Effect of strontium and barium doping on the magnetic state and electrical conductivity of GdCoO3 / N. B. Ivanova [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 8. - P. 1498-1506, DOI 10.1134/S1063783407080161. - Cited References: 36 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE
   ORDER
   OXIDE
   BEHAVIOR
   GLASSES
   LACOO3
   PR
   GD
   SM
   ND
Аннотация: A coordinated investigation of the magnetic and electrical properties of polycrystalline cobalt oxide compounds CdCoO3, Gd0.9Ba0.1CoO3, and Gd0.9Sr0.1CoO3 is carried out. Undoped GdCoO3 reveals a low conductivity; a magnetic moment of 7.4 mu(B) per molecule, which is less than the theoretical value for the Gd3+ ion; and an asymptotic Curie temperature of -6 K. Doping GdCoO3 with barium and strontium to substitution of 10 at. % Gd brings about an increase in the conductivity and magnetic transitions at T = 300 K for Gd0.9Ba0.1CoO3 and T = 170 K for Gd0.9Sr0.1CoO3. The magnetization anomalies imply the formation of magnetic clusters. The behavior of the electrical conductivity at high temperatures suggests a variable activation energy. At low temperatures, Mott hopping conduction sets in.

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Публикация на русском языке Влияние допирования стронцием и барием на магнитное состояние и электропроводность GdCoO[3] [Текст] / Н. Б. Иванова [и др.] // Физ. тверд. тела. - 2007. - Т. 49 Вып. 8. - С. 1427-1435

Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Guadalajara, CUCEI, Dept Fis, Guadalajara 44430, Jalisco, Mexico
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Departmento de Fisica, C.U.C.E.I., Universidade de Guadalajara, Guadalajara, Jalisco 44430, Mexico

Доп.точки доступа:
Ivanova, N. B.; Иванова, Наталья Борисовна; Kazak, N. V.; Казак, Наталья Валерьевна; Michel, C. R.; Balaev, A. D.; Балаев, Александр Дмитриевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Bulina, N. V.; Булина, Наталья Васильевна; Panchenko, E. B.
}
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Thermoelectric properties of the SmCoO3 and NdCoO3 cobalt oxides / V. A. Dudnikov, A. S. Fedorov, Y. S. Orlov [et al.] // Ceram. Int. - 2020. - Vol. 46, Is. 11. - P. 17987-17991, DOI 10.1016/j.ceramint.2020.04.113. - Cited References: 41. - This study was supported by the Russian Science Foundation, project no. 16-13-00060. . - ISSN 0272-8842. - ISSN 1873-3956

РУБ Materials Science, Ceramics
Рубрики:
MAGNETIC-PROPERTIES
   SPIN
   CONDUCTIVITY
   TRANSITIONS
   LACOO3
   SITE
Кл.слова (ненормированные):
Perovskite -- Thermoelectric oxide materials
Аннотация: The thermoelectric properties of the NdCoO3 and SmCoO3 rare-earth cobalt oxides with a perovskite structure have been investigated in a wide temperature range. It is shown that, in the low-temperature region, the thermal conductivity of the compounds has a sharp maximum and the electrical conductivity of the samples increases with temperature, whereas the Seebeck coefficient behaves nonmonotonically with increasing temperature. The SmCoO3 oxide is characterized by the positive thermopower over the entire investigated range with a sharp growth in the low-temperature region, attaining the maximum value (S ≈ 1000 μV/K) near room temperature, and a further decrease. It has been established that, in the NdCoO3 oxide, the Seebeck coefficient changes its sign, which was rarely observed in the La-based compounds and is atypical of the undoped rare-earth cobalt oxides. The thermopower maximum obtained at a temperature of 450 K is 400 μV/K. The regions of the fastest growth of the thermoelectric power factor correspond to the anomalies caused by the spin transition of Со3+ ions and the dielectric–metal transition.

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Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Krasnoyarsk Sci Ctr, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Lebedev Phys Inst, Moscow 119991, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Ioffe Inst, St Petersburg 194021, Russia.

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Fedorov, A. S.; Федоров, Александр Семенович; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Solovyov, L. A.; Vereshchagin, S. N.; Gavrilkin, S. Yu; Tsvetkov, A. Yu; Gorev, M. V.; Горев, Михаил Васильевич; Novikov, S., V; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Science FoundationRussian Science Foundation (RSF) [16-13-00060]
}
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