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1.
Avramov, P. V.
Effects of strong electron correlations in X-ray and electron
spectra
of high-T-c superconductors / P. V. Avramov, S. G. Ovchinnikov> // Phys. Solid State. - 2000. -
Vol. 42
,
Is. 5
. - P. 788-809,
DOI
10.1134/1.1131293. - Cited References: 92 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
COPPER-OXIDE SUPERCONDUCTORS
MULTIPLE-SCATTERING ANALYSIS
HIGH-ENERGY SPECTROSCOPY
ABSORPTION
-
SPECTRA
PHOTOELECTRON-
SPECTRA
EDGE STRUCTURE
PHOTOEMISSION
SPECTRA
INCOMPLETE SHELL
SINGLE-CRYSTAL
Аннотация:
The current state of theoretical and experimental studies on the electronic structure of high-T-c superconductors is analyzed. The agreement between the theory and experimental spectroscopic data is shown to be rather poor in certain cases. The reason is that the X-ray and electronic
spectra
reveal strong electron correlations. At the same time, no realistic model has been developed up to now in which both one-electron and multielectron mechanisms of the formation of the
spectra
could be described in a unified way in compounds containing transition and rare-earth elements. In this paper, particular attention is paid to a sudden-perturbation model, by which it has been possible to describe or interpret some X-ray and electronic
spectra
, including both one-electron and multielectron effects. (C) 2000 MAIK "Nauka/Interperiodica".
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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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2.
Calculating the energy
of vacancies and adatoms in a hexagonal SiC monolayer / A. A. Kuzubov [et al.]> // Russ. J. Phys. Chem. A. - 2012. -
Vol. 86
,
Is. 7
. - P. 1091-1095,
DOI
10.1134/S0036024412070138. - Cited References: 21 . - ISSN 0036-0244
РУБ
Chemistry, Physical
Рубрики:
INITIO MOLECULAR-DYNAMICS
ELECTRONIC-PROPERTIES
ABSORPTION
-
SPECTRA
Кл.слова (ненормированные):
silicon carbide
--
defects
--
adatoms
--
density functional method
Аннотация:
It is noted that the development of semiconductor SiC-electronics is prevented by a low quality of grown silicon carbide single crystals. It is found that structural defects of a substrate penetrating into an epitaxial layer upon subsequent homoepitaxial growth can considerably degrade a device's characteristics. We investigate the effect of the deformation of a hexagonal SiC monolayer on vacancy stability and material properties, and study the processes of silicon and carbon adatom migration over a surface of SiC.
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Публикация на русском языке
Расчет энергии вакансий и адатомов в монослое гексагонального SiC [Текст] / А. А. Кузубов [и др.] // Журн. физ. химии. - 2012. - Т. 86 № 7. - С. 1207-1211
Держатели документа:
[Kuzubov, A. A.
Eliseeva, N. S.
Tomilin, F. N.
Tolstaya, A. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Kuzubov, A. A.
Krasnov, P. O.
Tomilin, F. N.
Fedorov, A. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Kuzubov, A. A.
Krasnov, P. O.] Siberian State Technol Univ, Krasnoyarsk 660049, Russia
Доп.точки доступа:
Kuzubov, A. A.; Кузубов, Александр Александрович; Eliseeva, N. S.; Krasnov, P. O.; Краснов, Павел Олегович; Tomilin, F. N.; Томилин, Феликс Николаевич; Fedorov, A. S.; Федоров, Александр Семенович; Tolstaya, A. V.
}
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3.
Kim, J.
Charge transfer and Mott-Hubbard excitations in FeBO3: An Fe K-edge resonant inelastic x-ray scattering study / J. . Kim, Y. . Shvyd'ko, S. G. Ovchinnikov> // Phys. Rev. B. - 2011. -
Vol. 83
,
Is. 23
. - Ст. 235109,
DOI
10.1103/PhysRevB.83.235109. - Cited References: 67. - Yu.Sh. acknowledges the long-standing effort of his colleagues from the IXS Collaborative Design Team in building MERIX instrument at the XOR-IXS 30-ID beamline at the APS, in particular, J. Hill, S. Coburn (BNL), C. Burns (WMU), E. Alp, T. Toellner, and H. Sinn (APS). He is also indebted to R. Khachatryan (APS), M. Wieczorek (APS), and A. Said (APS) for the help in manufacturing the Ge(620) analyzer. P. Siddons (BNL) is acknowledged for building the microstrip detector for the MERIX spectrometer. The help of the XOR-IXS 30-ID beamline personnel at the Advanced Photon Source: T. Roberts, A. Said, and M. Upton are greatly appreciated. Use of the Advanced Photon Source was supported by the US DOE, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. S.O. acknowledges Russian Academy of Science Physical Department program 5.7 "Strongly correlated electrons," RFFI Grant No. 09-02-00171, RFFI Grant No. 10-02-00251, and the Siberian-Ural integration Project No. 40. . - ISSN 1098-0121
РУБ
Physics, Condensed Matter
Рубрики:
TRANSITION-METAL COMPOUNDS
ELECTRONIC-STRUCTURE
OPTICAL-PROPERTIES
ABSORPTION
-
SPECTRA
EMISSION
SPECTRA
FERROMAGNET
DEPENDENCE
COMPLEXES
RAMAN
Аннотация:
Momentum-resolved resonant inelastic x-ray scattering (RIXS) spectroscopy has been carried out successfully at the Fe K-edge for the first time. The RIXS
spectra
of a FeBO3 single crystal reveal a wealth of information on similar or equal to 1-10 eV electronic excitations. The IXS signal resonates when the incident photon energy approaches the pre-edge (1s-3d) and the main-edge (1s-4p) of the Fe K-edge
absorption
spectrum. The RIXS
spectra
measured at the pre-edge and the main-edge show quantitatively different dependences on the incident photon energy, momentum transfer, photon polarization, and temperature. We present a multielectron analysis of the Mott-Hubbard (MH) and charge transfer (CT) excitations, and calculate their energies. Electronic excitations observed in the pre-edge and main-edge RIXS
spectra
are interpreted as MH and CT excitations, respectively. We propose the electronic structure around the chemical potential in FeBO3 based on the experimental data.
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Держатели документа:
[Kim, Jungho
Shvyd'ko, Yuri] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[Ovchinnikov, S. G.] Russian Acad Sci, Kirensky Inst, Siberian Div, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, United States
Kirensky Institute, Siberian Division, Russian Academy of Sciences, 660036, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, 660014, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Shvyd'ko, Y.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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4.
Magnetic and optical
properties and electron paramagnetic resonance of gadolinium-containing oxide glasses / J. . Kliava [et al.]> // J. Phys.: Condens. Matter. - 2003. -
Vol. 15
,
Is. 40
. - P. 6671-6681,
DOI
10.1088/0953-8984/15/40/005. - Cited References: 30 . - ISSN 0953-8984
РУБ
Physics, Condensed Matter
Рубрики:
ABSORPTION
-
SPECTRA
FARADAY-ROTATION
SPIN-RESONANCE
IONS
GD3+
SPECTROSCOPY
BEHAVIOR
GD-3
Кл.слова (ненормированные):
Doping (additives)
--
Electronic structure
--
Glass
--
Lanthanum compounds
--
Light
absorption
--
Magnetic susceptibility
--
Oxides
--
Paramagnetic resonance
--
Positive ions
--
Rate constants
--
Substitution reactions
--
Absorption
band
--
Gadolinium containing oxide glasses
--
Positive Weiss constants
--
Gadolinium compounds
Аннотация:
Magnetic susceptibility, electron paramagnetic resonance (EPR) and optical
absorption
have been studied in a glass system 20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2 + GeO2) with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses and ascribed to clustering of Gd3+ ions. Computer simulations of the EPR
spectra
show that the short-range ordering in the environment of the Gd3+ ions is well preserved. The relative distribution widths of the ligand coordinates are less than 2%. In the more heavily doped glasses the EPR
spectra
are superpositions of signals arising from isolated ions and ferromagnetic clusters. The increase of Gd3+ concentration is shown to change substantially the strong optical
absorption
edge while only small changes of f-f
absorption
band characteristics are observed. This difference is associated with the different effect of the Gd ion clustering on the mechanisms of the strong
absorption
in the ultraviolet region and the f-f
absorption
.
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Держатели документа:
Univ Bordeaux 1, CPMOH, F-33405 Talence, France
SI Vavilov State Opt Inst, St Petersburg 199034, Russia
Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel
Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
CPMOH, Universite Bordeaux-I, 33405 Talence Cedex, France
L V Kirensky Inst. of Physics, SB RAS, Krasnoyarsk 660036, Russian Federation
Bar-Ilan University, Department of Physics, Ramat-Gan 52900, Israel
Bar-Ilan University, Department of Chemistry, Ramat-Gan 52900, Israel
S V Vavilov State Optical Institute, St Petersburg 199034, Russian Federation
Доп.точки доступа:
Kliava, J.; Edelman, I. S.; Эдельман, Ирина Самсоновна; Potseluyko, A. M.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Berger, R.; Bruckental, I.; Yeshurun, Y.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Zarubina, Y. V.
}
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5.
Nature of optical
properties of GdFe3(BO3)4 and GdFe2.1Ga0.9(BO3)4 crystals and other 3d5 antiferromagnets / A. V. Malakhovskii [et al.]> // Eur. Phys. J. B. - 2012. -
Vol. 85
,
Is. 2
. - P. 80,
DOI
10.1140/epjb/e2012-20953-1. - Cited References: 70. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by Russian President Grant NSh-1044.2012.2. . - ISSN 1434-6028
РУБ
Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)4
D-D TRANSITIONS
EARTH FERROBORATES RFE3(BO3)4
ABSORPTION
-
SPECTRA
OCTAHEDRAL COMPLEXES
ELECTRONIC-STRUCTURE
NEEL TEMPERATURE
FINE-STRUCTURE
EXCHANGE
IONS
Аннотация:
Influence of the partial substitution of paramagnetic Fe3+ ions by diamagnetic Ga3+ ions in the trigonal crystal GdFe3 (BO3)4 on its optical and magnetic properties is studied and discussed in connection with problems common for all antiferromagnets containing 3d 5 ions. Polarized optical
absorption
spectra
and linear birefringence of GdFe3 (BO3)4 and GdFe2.1Ga0.9 (BO3)4 single crystals have been measured in the temperature range 85–293 K. Specific heat temperature dependence (2–300 K) and structure of GdFe2.1Ga0.9 (BO3)4 crystal have been also studied. As a result of substitution of 30% Fe to Ga the Neel temperature diminishes from 38 till 16 K, the strong
absorption
band edge shifts on 860 cm-1 (0.11 eV) to higher energy and the d-d transitions intensity decreases substantially larger than the Fe concentration does. Strong
absorption
band edge is shown to be due to Mott-Hubbard transitions. Correlation between position of the strong
absorption
band edge and the Neel temperature of antiferromagnets has been revealed. Properties of the doubly forbidden d-d transitions in the studied crystals and in other antiferromagnets are explained within the framework of the model of the exchange-vibronic pair
absorption
, which is theoretically analyzed in detail. The model permitted us to determine the connection between parameters of d-d
absorption
bands (intensity, width and their temperature dependences), on the one hand, and the exchange, spin-orbit and electron-lattice interactions, on the other hand.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Leont'ev, A. A.; Леонтьев, Андрей Александрович; Kartashev, A. V.; Карташев, Андрей Васильевич; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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6.
Ovchinnikov, S. G.
Application of synchrotron radiation to the study of magnetic materials / S. G. Ovchinnikov> // Uspekhi Fiz. Nauk. - 1999. -
Vol. 169
,
Is. 8
. - P. 869-887. - Cited References: 93 . - ISSN 0042-1294
РУБ
Physics, Multidisciplinary
Рубрики:
X-RAY-SCATTERING
RESONANCE EXCHANGE SCATTERING
RARE-EARTH-METALS
CIRCULAR-DICHROISM
VALENCE STATES
CO/PD(111) MULTILAYERS
ABSORPTION
-
SPECTRA
PHASE-TRANSITIONS
SPIN POLARIZATION
EDGE STRUCTURE
Аннотация:
The recent results of the studies of magnetic materials using synchrotron irradiation are reviewed. The influence of magnetic effects on X-ray scattering is studied for linearly and circularly polarized photons, and effects of magnetic circular dichroism on the
spectra
of X-ray
absorption
and photoelectron emission are discussed. It is shown that X-ray magnetooptics techniques provide fine details of crystal and magnetic structures and also make it possible to separate the spin and orbital contributions to the total moment; to obtain element- and position-sensitive information on the magnetic properties of the material; to visualize domains and domain walls; and to probe magnetization reversal dynamics. A comparison of magnetic neutron and X-ray methods is given.
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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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7.
Thermo-dynamical contours of
electronic-vibrational
spectra
simulated using the statistical quantum-mechanical methods [Text] / V. Pomogaev [et al.]> // Theor. Chem. Acc. - 2011. -
Vol. 130
,
is. 4-6
. - P609-632,
DOI
10.1007/s00214-011-0936-6. - Cited Reference Count: 112. - Гранты: We would like to acknowledge scientific discussions with the following collaborators and friends: Daniel Chipman, Victor Ya. Artyukhov for common discussions concerning theoretical questions and methodology; John S. Tse and Dennis D. Klug for initial discussions concerning the properties of cyanoanthracene; and Yuriko Aoki for discussions of benzene and estradiol. We would also like to thank the following funding agencies and institutions for supporting this work during its various stages of development: Kyushu University, Japan; Steacie Institute for Molecular Sciences, Canada; University of Notre Dame, USA; Siberian Physical-Technical Institute, Russia; Siberian Federal University, Russia; Kirensky Institute of Physics, Russia. We would like to thank FAPESP for project 16782-2/2009 which allowed Prof. Jalkanen to visit LEVB at UniVaP for the period from June 2010 to May 2011 from the Quantum Protein (QuP) Center at the Technical University in Denmark during which time this work was completed. - Финансирующая организация: Kyushu University, Japan; Steacie Institute for Molecular Sciences, Canada; University of Notre Dame, USA; Siberian Physical-Technical Institute, Russia; Siberian Federal University, Russia; Kirensky Institute of Physics, Russia . - DEC. - ISSN 1432-881X
Рубрики:
DENSITY-FUNCTIONAL THEORY
INITIO MOLECULAR-DYNAMICS
CIRCULAR-DICHROISM
SPECTRA
LASER-INDUCED FLUORESCENCE
NUCLEAR SHIELDING TENSORS
ALANINE N'-METHYLAMIDE
ALKALINE-EARTH DIMERS
ABSORPTION
-
SPECTRA
HYDRATED ELECTRON
AQUEOUS-SOLUTION
Кл.слова (ненормированные):
organic compounds
--
molecular dynamics
--
photophysical properties
--
electronic
spectra
--
electronic
spectra
--
molecular dynamics
--
organic compounds
--
photophysical properties
Аннотация:
Three polycyclic organic molecules in various solvents focused on thermo-dynamical aspects were theoretically investigated using the recently developed statistical quantum mechanical/classical molecular dynamics method for simulating electronic-vibrational
spectra
. The
absorption
bands of estradiol, benzene, and cyanoanthracene have been simulated, and most notably, the increase in the spectral intensity for the lowest excited state transition as the temperature is increased observed experimentally is well reproduced. In addition, this method has been extended to treat luminescent processes also, and it is seen that the experimental emission spectrum of cyanoanthracene is also well described. The method still needs further refinement, but results to date, including those presented in this work, document clearly that our model is one which is able to treat the many complex effects that the environment have on electronic
absorption
and emission
spectra
.
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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Univ Notre Dame, Notre Dame Radiat Lab, Notre Dame, IN 46556 USA
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Vale Paraiba, Lab Biomed Vibrat Spectrscopy, Inst Res & Dev, BR-12244000 Sao Paulo, Brazil
Tech Univ Denmark, Dept Phys, Quantum Prot QuP Ctr, DK-2800 Lyngby, Denmark
Доп.точки доступа:
Pomogaev, V.; Avramov, P. V.; Аврамов, Павел Вениаминович; Kachin, S.; Pomogaeva, A.; Jalkanen, K. J.
}
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