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Ovchinnikov, S. G.
Metallization and spin crossover in Magnesiowustite (Mg1-x Fe (x) O) at high pressures / S. G. Ovchinnikov // JETP Letters. - 2011. - Vol. 94, Is. 3. - P. 192-196, DOI 10.1134/S0021364011150094. - Cited References: 25. - The work was supported by the Division of Physical Sciences, Russian Academy of Sciences (program "Strong Electron Correlations"), the Siberian and Ural Branches, Russian Academy of Sciences (joint project no. 40), the Russian Foundation for Basic Research (project nos. 09-02-00171 and 10-02-00251), and the Ministry of Education and Sciences (project no. KG P891, federal program "Human Resources"). I am grateful to Yu.S. Orlov, N.V. Lishneva, and I.A. Makarov for their assistance in this work. . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
EARTHS MANTLE
TRANSITION
Аннотация: The pressure-temperature phase diagram of magnesiowustite has been constructed using the many-electron LDA+GTB approach. The phase diagram includes a quantum critical point at P (c) = 55 GPa and has a symmetrical distribution of high-spin and low-spin states. The existence of a metallic state in a narrow temperature range above the critical point is predicted.

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Держатели документа:
[Ovchinnikov, S. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
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Spin crossover and Mott-Hubbard transition under high pressure and high temperature in the low mantle of the Earth / S. G. Ovchinnikov [et al.] // J. Phys.: Conf. Ser. - 2015. - Vol. 653. - Ст. 012095, DOI 10.1088/1742-6596/653/1/012095. - Cited References:22 . - ISSN 1742-6588

РУБ Physics, Applied + Physics, Multidisciplinary
Рубрики:
PHASE-TRANSITION
   GEOMAGNETIC DATA
   MAGNESIOWUSTITE
   IRON
   METALLIZATION
   LAYER
Аннотация: Effect of high pressure induced spin crossover on the magnetic, electronic and structural properties of the minerals forming the Earth's low mantle is discussed. The low temperature P, T phase diagram of ferropericlase has the quantum phase transition point P = 56 GPa at T = 0 confirmed recently by the synchrotron Mossbauer spectroscopy. The LDA+GTB calculated phase diagram describes the experimental data. Its extension to the high temperature resulted earlier in prediction of the metallic properties of the Earth's mantle at the depth 1400 km h 1800 km. Estimation of the electrical conductivity based on the percolation theory is given. We discuss also the thermodynamic properties and structural anomalies resulting from the spin crossover and metal insulator transition and compare them with the experimental seismic and geomagnetic field data.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Ovchinnikova, T. M.; Plotkin, V. V.; Dyad'kov, P. G.; International Conference on Interaction of Intense Energy Fluxes with Matter (XXX ; 1–6 March 2015 ; Elbrus, Kabardino-Balkaria, Russia); International conference on interaction of intense energy fluxes(30 ; 2015 ; March ; 01-06)
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    Pressure-induced metallization of the Mott insulator FeXMn1−XS system / G. M. Abramova [et al.] // J. Magn. Magn. Mater. - 2018. - Vol. 465. - P. 775-779, DOI 10.1016/j.jmmm.2018.05.056. - Cited References: 23. - This study was supported by the KAKENHI JSPS, project no. 18540317. . - ISSN 0304-8853
   Перевод заглавия: Металлизация, вызванная давлением, в системе мотовских изоляторов FeXMn1−XS
Кл.слова (ненормированные):
Correlated electron systems -- Metal-insulator transitions -- High pressure and low temperature
Аннотация: Electrical resistivity of the FeXMn1−XS (0 ≤ X ≤ 0.29) single crystals based on the Mott insulator α-MnS is experimentally studied in the temperature range of 2–300 K at ambient pressure (P = 0) and at high (up to 30 GPa) hydrostatic pressures for x = 0.12. The electron subsystem of FeXMn1−XS undergoes insulator-to-metal transitions indicated by a resistivity drop by a factor of 106 with an increase in the chemical pressure (X) due to the cation substitution under ambient conditions and at the hydrostatic pressure (PC = 27 ± 5 GPa) for x = 0.12. The results obtained show that the hydrostatic pressure - and cation-substitution induced insulator-to-metal transitions in the α-MnS-based Mott compounds have similar mechanisms. The dependence of the critical hydrostatic pressure PC on the Fe content in FeXMn1−XS is established.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
KYOKUGEN, Center for Science and Technology under Extreme Conditions, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation

Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Hanzawa, A.; Kagayama, T.; Mita, Y.; Eremin, E. V.; Еремин, Евгений Владимирович; Zeer, G. M.; Zharkov, S. M.; Жарков, Сергей Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Spin-crossover-induced Mott transition and the other scenarios of metallization in 3d(n) metal compounds / I. S. Lyubutin [et al.] // Phys. Rev. B. - 2009. - Vol. 79, Is. 8. - Ст. 85125, DOI 10.1103/PhysRevB.79.085125. - Cited References: 41 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
RARE-EARTH ORTHOFERRITES
   NARROW ENERGY BANDS
   HIGH-PRESSURE
   MAGNETIC COLLAPSE
   ELECTRON CORRELATIONS
   PHASE-TRANSITION
   STATE
   Y3FE5O12
   OXIDES
   EQUATION
Кл.слова (ненормированные):
bismuth compounds -- Hubbard model -- localised states -- metal-insulator transition -- metallisation -- spin systems
Аннотация: A different "Hubbard energy control" mechanism of the insulator-metal transition (IMT) in Mott-Hubbard insulators is discussed. This mechanism can be initiated by the lattice compression and it is driven by a spin crossover of 3d(5) ions from the high-spin state to the low-spin state. The spin crossover suppresses the effective Hubbard parameter U-eff down to the value enabling the insulator-metal transition according to the Mott mechanism U-eff/W approximate to 1. The classification of possible scenarios of metallization in the other 3d(n) metal compounds is also performed.

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Держатели документа:
[Lyubutin, I. S.] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
[Ovchinnikov, S. G.] Russian Acad Sci, Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
[Gavriliuk, A. G.] RAS, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
[Struzhkin, V. V.] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA
ИФ СО РАН
Institute of Crystallography, Russian Academy of Sciences, Leninsky Pr. 59, Moscow 119333, Russian Federation
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute for High Pressure Physics, RAS, Troitsk, Moscow Region, Russian Federation
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States

Доп.точки доступа:
Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavriliuk, A. G.; Struzhkin, V. V.
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Plotkin, V. V.
Detecting a magnesiowustite phase transition in the lower mantle by inversion of geomagnetic data / V. V. Plotkin, P. G. Dyad'kov, S. G. Ovchinnikov // Russ. Geol. Geophys. - 2014. - Vol. 55, Is. 9. - P. 1138-1145, DOI 10.1016/j.rgg.2014.08.009. - Cited References: 26. - The study was supported by the Siberian Branch of the Russian Academy of Sciences (interdisciplinary integration project no. 96). . - ISSN 1068-7971. - ISSN 1878-030X

РУБ Geosciences, Multidisciplinary
Рубрики:
ELECTRICAL-CONDUCTIVITY
   SATELLITE MEASUREMENTS
   EARTHS MANTLE
   GLOBAL MVS
   INDUCTION
   FIELD
   METALLIZATION
Кл.слова (ненормированные):
magnesiowustite -- metallic state -- phase transition -- lower mantle -- conductivity -- geomagnetic variations -- global network
Аннотация: Global geomagnetic data are inverted for detecting a high-conductivity layer at depths of 1500-2000 km to test the hypothesis of a magnesiowustite phase transition in the lower mantle. We present the results of processing of both synthetic and global data-average monthly values of the geomagnetic field from 1920 to 2009. The inverted global data are consistent with the possible existence of a high-conductivity layer at great depths in the lower mantle.

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Публикация на русском языке Плоткин, Валерий Викторович. Выявление фазового перехода магнезиовюстита в нижней мантии: инверсия геомагнитных данных [Текст] / В. В. Плоткин, П. Г. Дядьков, С. Г. Овчинников // Геол. и геофиз. - Новосибирск : Изд-во СО РАН, 2014. - Т. 55 № 9. - С. 1436-1445

Держатели документа:
Russian Acad Sci, AA Trofimuk Inst Petr Geol & Geophys, Siberian Branch, Novosibirsk 630090, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Dyad'kov, P. G.; Дядьков, Петр Георгиевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Плоткин, Валерий Викторович; Siberian Branch of the Russian Academy of Sciences [96]
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Plotkin, V. V.
Possible contribution of lower mantle magnesiowüstite metallization into geomagnetic data / V. V. Plotkin, P. G. Dyad'kov, S. G. Ovchinnikov // Rus. Geol. Geophys. - 2013. - Vol. 54, Is. 3. - P. 263-271DOI 10.1016/j.rgg.2013.02.002
Аннотация: Phase change of dielectric magnesiowüstite in the lower mantle may leave signatures in geomagnetic records of the globally distributed array of observatories. We investigate theoretically which may be the contribution of magnesiowüstite metallization to geomagnetic data and how the variations of magnetic susceptibility associated with this phase change may influence the Earth's field. The modeling is performed using spherical harmonic analysis (SHA) of mantle electromagnetic (EM) responses in observatory geomagnetic data at periods of decades, 11 years, 1 year, and 27 days. The existence of a lower mantle conductor is checked against monthly means of real observatory records from 1920 through 2009 obtained by preliminary processing.

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Публикация на русском языке Плоткин, Валерий Викторович. Возможный вклад фазового перехода магнезиовюстита в нижней мантии земли в геомагнитные данные / В. В. Плоткин // Геология и геофизика. - 2013. - Т. 54, № 3. - С. 345-356

Держатели документа:
Russian Acad Sci, Siberian Branch, AA Trofimuk Inst Petr Geol & Geophys, Novosibirsk 630090, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Dyad'kov, P. G.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Плоткин, Валерий Викторович.
Возможный вклад фазового перехода магнезиовюстита в нижней мантии земли в геомагнитные данные / В. В. Плоткин, П. Г. Дядьков, С. Г. Овчинников // Геол. и геофиз. - 2013. - Т. 54, № 3. - С. 345-356
Аннотация: Рассматриваются возможные проявления в геомагнитных данных, регистрируемых мировой сетью обсерваторий, перехода магнезиовюстита из полупроводникового состояния в металлическое в нижней мантии. В частности, даны теоретические оценки предполагаемых возмущений многолетних, циклических (11-летних), годовых и 27-дневных геомагнитных вариаций. Теоретически рассмотрены эффекты ослабления магнитного поля Земли, вызываемые изменениями магнитной восприимчивости при фазовых переходах магнезиовюстита. Приведены также предварительные результаты обработки данных мировой сети — среднемесячных значений геомагнитного поля с 1920 по 2009 г.

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Переводная версия Possible contribution of lower mantle magnesiowüstite metallization into geomagnetic data. - [Б. м. : б. и.]

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Дядьков, Петр Георгиевич; Овчинников, Сергей Геннадьевич; Ovchinnikov, S. G.
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Lyubutin, I. S.
Spin crossovers in Mott-Hubbard insulators at high pressures / I. S. Lyubutin, S. G. Ovchinnikov // J. Magn. Magn. Mater. - 2012. - Vol. 324, Is. 21. - P. 3538-3541, DOI 10.1016/j.jmmm.2012.02.084. - Cited References: 16. - We acknowledge the help and discussions with Drs. A.G. Gavriliuk, V.V. Struzkin and J.F. Lin. Supports by RFBR (Grants # 09-02-00171, 10-02-00251, # 11-02-00636, # 11-02-00291, # 11-02-12089) and by the RAS Program "Strongly correlated electronic systems" are acknowledged. . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
ELECTRONIC-TRANSITION
   MAGNETIC COLLAPSE
   PHASE-TRANSFORMATIONS
   BIFEO3 CRYSTAL
   METAL-OXIDES
   METALLIZATION
Кл.слова (ненормированные):
Electronic structure -- Spin crossover -- High pressure -- Magnetic transition
Аннотация: The high-pressure induced phase transitions initiated by electronic transition in 3d ions from the high-spin (HS) to the low-spin (LS) state (HS-LS spin-crossover) are considered. Behavior of the system with d(6) electronic configuration is investigated in the ground state of zero temperature and critical pressure P-c. Magnetic properties of the Mott-Hubbard insulator (Mg1-xFex)O are studied in the vicinity of the quantum critical point (T=0, P-c). At the critical pressure of spin crossover P-c, the spin gap energy epsilon(S) between HS and LS states is zero. The quantum spins fluctuations HS double left right arrow LS do not require any energy, and the antiferromagnetism is destroyed in the quantum critical point by the first order transition. (C) 2012 Published by Elsevier B.V.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Moscow International Symposium on Magnetism(5 ; 2011 ; Aug. ; 21-25 ; Moscow)
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Metallic transition of the colossal magnetoresistance material FexMn1-xS (x= 0.18) under high pressure / Y. Mita [et al.] // J. Korean Phys. Soc. - 2013. - Vol. 63, Is. 3. - P. 325-328, DOI 10.3938/jkps.63.325 . - ISSN 0374-4884
Кл.слова (ненормированные):
Metallization -- Mott insulator -- Pressure
Аннотация: A pressure-induced phase transition in the colossal magnetoresistance (CMR) material Fe0.18Mn0.82S was studied by using infrared (IR) reflection and X-ray diffraction (XRD) at pressures up to 40 GPa at room temperature. XRD shows that the crystal structure of this sample is a NaCl-type structure at ambient pressure, that a structural change starts around 17 GPa, and that a mixed phase mixed between the NaCl-type low-pressure phase and an unknown structure high pressure phase continues up to around 25 GPa. On the other hand, the IR reflectivity increases with increasing pressure from 15 GPa and becomes remarkably high around 20 GPa. The spectra do not show any changes from 30 GPa. From these results, we conclude that the phase transition of Fe0.18Mn0.82S at room temperature starts around 15 GPa and is completed around 30 GPa and that the high-pressure phase is not a band-overlapping semimetal but a true metal. В© 2013 The Korean Physical Society.

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Держатели документа:
Osaka Univ, Grad Sch Engn Sci, Osaka 5608531, Japan
Osaka Univ, Ctr Quantum Sci & Technol Extreme Condit, Osaka 5608531, Japan
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
AV Nikolaev Inst Inorgan Chem, Krasnoyarsk 630090, Russia

Доп.точки доступа:
Mita, Y.; Kagayama, T.; Abramova, G. M.; Абрамова, Галина Михайловна; Petrakovskii, G. A.; Петраковский, Герман Антонович; Sokolov, V.V.
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