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1.
Photonic amplification and
switching through nonlinear coupling with negative
phonons
/ A. K. Popov [et al.]> // Int. Conf. Phot. Switch., PS 2012. - 2012. - Ст. 6608287. - P. . - ISBN 9782912328618 (ISBN)
Кл.слова (ненормированные):
extraordinary stimulated Raman scattering
--
negative group velocity
--
nonlinear optical wave mixing
--
optical phonos
--
photonic components and devices
Аннотация:
A family of switching photonic devices and amplifiers are proposed which mimic and utilize extraordinary coherent nonlinear-optical frequency conversion processes commonly attributed to plasmonic metamaterials. В© 2012 SEE.
Scopus
Доп.точки доступа:
Popov, A. K.; Попов, Александр Кузьмич; Myslivets, S. A.; Мысливец, Сергей Александрович; Shalaev, M. I.; Slabko, V. V.; Слабко, Виталий Васильевич; International Conference on Photonics in Switching (6 ; 2012 ; Sept ; 11-14 ; Ajaccio, France)
}
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2.
Photonic devices with
negative
phonons
: a concept, extraordinary properties and materials / A. K. Popov [et al.]> // 8th International Conference on Optics-Photonics Design and Fabrication (ODF12) : Book of abstracts. - 2012. - P. 4S4-02
Аннотация:
A family of readily available optical materials and photonic devices are proposed which mimic extraordinary coherent nonlinear-optical frequency conversion processes commonly attributed to plasmonic metamaterials that are very challenging to make.
Материалы конференции
Доп.точки доступа:
Popov, A. K.; Попов, Александр Кузьмич; Shalaev, M. I.; Myslivets, S. A.; Мысливец, Сергей Александрович; Slabko, V. V.; Слабко, Виталий Васильевич; Национальный исследовательский университет ИТМО; Оптическое общество им. Д.С. Рождественского; Optics Design Group of Optical Society of Japan, JSAP; International Conference on Optics-Photonics Design and Fabrication (ODF12) (8 ; 2012 ; July ; 2-5 ; S.-Petersburg)
}
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3.
Unidirectional amplification and
shaping of optical pulses by three-wave mixing with negative
phonons
/ A. K. Popov [et al.]> // Appl. Phys. A. - 2013. -
Vol. 115
,
Is. 2
. - P. 523-529,
DOI
10.1007/s00339-013-8078-4. - Cited References: 32. - This work was supported in parts by the US Air Force Office of Scientific Research under Grant No. FA950-12-1-298, by the US National Science Foundation under Grant No. ECCS-1028353, by the Presidium of the Russian Academy of Sciences under Grant No. 24-31 and by the Russian Federal Program on Science, Education and Innovation under Grant No. 14.A18.21.1942. . - ISSN 0947-8396. - ISSN 1432-0630
РУБ
Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
LEFT-HANDED METAMATERIALS
2ND-HARMONIC GENERATION
INDEX METAMATERIALS
NONLINEAR OPTICS
PARAMETRIC AMPLIFICATION
COMPENSATING LOSSES
BACKWARD WAVES
OSCILLATOR
CRYSTALS
Аннотация:
A possibility to greatly enhance frequency-conversion efficiency of stimulated Raman scattering is shown by making use of extraordinary properties of three-wave mixing of ordinary and backward waves. Such processes are commonly attributed to negative-index plasmonic metamaterials. This work demonstrates the possibility to replace such metamaterials that are very challenging to engineer by readily available crystals which support elastic waves with contra-directed phase and group velocities. The main goal of this work was to investigate specific properties of indicated nonlinear optical process in short-pulse regime and to show that it enables elimination of fundamental detrimental effect of fast damping of optical
phonons
on the process concerned. Among the applications is the possibility of creation of a family of unique photonic devices such as unidirectional Raman amplifiers and femtosecond pulse shapers with greatly improved operational properties.
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Держатели документа:
Univ Wisconsin, Stevens Point, WI 54481 USA
Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Popov, A. K.; Попов, Александр Кузьмич; Shalaev, M. I.; Шалаев, Михаил Игоревич; Myslivets, S. A.; Мысливец, Сергей Александрович; Slabko, V. V.; Слабко, Виталий Васильевич; US Air Force Office of Scientific Research [FA950-12-1-298]; US National Science Foundation [ECCS-1028353]; Presidium of the Russian Academy of Sciences [24-31]; Russian Federal Program on Science, Education and Innovation [14.A18.21.1942]
}
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4.
Nonlinear optics with
backward waves: Extraordinary features, materials and applications [] / A. K. Popov [et al.]> // Solid State Phenom. : Selected, peer reviewed papers. - 2014. -
Vol. 213
: Physics and Technology of Nanostructured Materials II. - P. 222-225,
DOI
10.4028/www.scientific.net/SSP.213.222 . - ISSN 1662-9779. - ISSN 9783-0378
Кл.слова (ненормированные):
Backward waves
--
Negative group velocity
--
Negative-index metamaterials
--
Nonlinear optical frequency mixing
--
Optical
phonons
--
Spatial dispersion
Аннотация:
Extraordinary properties of nonlinear-optical propagation processes are investigated that involve electromagnetic or elastic waves with negative group velocity. Nanostructured materials that support such waves and prospective unique photonic devices are described. В© (2014) Trans Tech Publications, Switzerland.
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,
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Доп.точки доступа:
Galkin, N. \ed.\; Popov, A. K.; Slabko, V. V.; Слабко, Виталий Васильевич; Shalaev, M. I.; Nefedov, I. S.; Myslivets, S. A.; Мысливец, Сергей Александрович; Asian School-Conference on Physics and Technology of Nanostructured Materials(2 ; 2013 ; Aug. ; 20-27 ; Vladivostok); Азиатская школа-конференция по физике и технологии наноструктурированных материалов(2 ; 2013 ; авг. ; 20-27 ; Владивосток)
}
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5.
Prokert, F.
Neutron scattering studies on phase transition and phonon dispersion in Cs//2NaBiCl//6 / F. Prokert, K. S. Aleksandrov> // Phys Status Solidi B. - 1984. -
Vol. 124
,
Is. 2
. - P. 503-513,
DOI
10.1002/pssb.2221240208. - Cited References: 24 . - ISSN 0370-1972
Кл.слова (ненормированные):
NEUTRONS - Scattering
--
PHONONS
--
PHASE TRANSITION
--
PHONON DISPERSION
--
CESIUM COMPOUNDS
Аннотация:
The structural phase transition (PT) of elpasolite-type crystal Cs//2NaBiCl//6 is investigated by neutron scattering. At first the acoustic phonon dispersion is measured at room temperature for the high-symmetric directions DELTA , SIGMA , and LAMBDA of the Brillouin zone. The transverse rotary mode is studied for phonon wave vectors q parallel as well as perpendicular to DELTA and the dispersion shows a quasi-two-dimensional behavior of the Cl-octahedra rotation. At cooling down to the PT, this branch shows a softening along DELTA , reaching the lowest energies at the zone center. The PT, which is found to be of weakly first order, seems to be driven and triggered by the ferrorotative octahedra mode.
Scopus
,
WOS
Держатели документа:
LV Kirensky Phys Inst,Krasnoyarsk 660036,,USSR
ИФ СО РАН
Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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6.
Coupling of Hubbard
fermions with
phonons
in La2 CuO4: A combined study using density-functional theory and the generalized tight-binding method / E. I. Shneyder [et al.]> // J. Alloys Compd. - 2015. -
Vol. 648
. - P. 258-264,
DOI
10.1016/j.jallcom.2015.05.150. - Cited References: 60. - We acknowledge the stimulating discussions with V.V. Val'kov, D.M. Dzebisashvilly, M.M. Korshunov and I.S. Sandalov. E.I.S. and S.G.O. are thankful to the Russian Science Foundation (project No. 14-12-00061) for the support of the research given in Sections 2, 6 and 7. E.E.K. and I.A.N. are thankful to the State Contract No. 0389-2014-0001 and RFBR grant No. 14-02-00065 for the support of the research given in Section 5. Financial support of the research given in Sections 3 and 4 by the Austrian Federal Government (in particular from Bundesministerium fur Verkehr, Innovation und Technologie and Bundesministerium fur Wissenschaft, Forschung und Wirtschaft) represented by Osterreichische Forschungsforderungsgesellschaft mbH and the Styrian and the Tyrolean Provincial Government, represented by Steirische Wirtschaftsforderungsgesellschaft mbH and Standortagentur Tirol, within the framework of the COMET Funding Programme is gratefully acknowledged by C.D. and J.S. . - ISSN 0925-8388
РУБ
Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
MEAN-FIELD THEORY
LINEAR-RESPONSE THEORY
CUPRATE SUPERCONDUCTORS
ELECTRONIC-STRUCTURE
CORRELATED SYSTEMS
LATTICE-DYNAMICS
BAND-STRUCTURE
LA2CUO4
MODEL
LA2-XSRXCUO4
Кл.слова (ненормированные):
High-temperature superconductivity
--
Electron-phonon coupling
--
Density-functional theory
--
Generalized tight-binding approach
Аннотация:
We present results for the electron-phonon interaction of the Γ-point
phonons
in the tetragonal high-temperature phase of La2 CuO4 obtained from a hybrid scheme, combining density-functional theory (DFT) with the generalized tight-binding approach. As a starting point, eigenfrequencies and eigenvectors for the Γ-point
phonons
are determined from DFT within the frozen phonon approach utilizing the augmented plane wave + local orbitals method. The so obtained characteristics of electron-phonon coupling are converted into parameters of the generalized tight-binding method. This approach is a version of cluster perturbation theory and takes the strong on-site electron correlations into account. The obtained parameters describe the interaction of
phonons
with Hubbard fermions which form quasiparticle bands in strongly correlated electron systems. As a result, it is found that the Γ-point
phonons
with the strongest electron-phonon interaction are the A2u modes (236 cm-1, 131 cm-1 and 476 cm-1). Finally it is shown, that the single-electron spectral-weight redistribution between different Hubbard fermion quasiparticles results in a suppression of electron-phonon interaction which is strongest for the triplet Hubbard band with z oriented copper and oxygen electrons. © 2015 Elsevier B.V. All rights reserved.
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Держатели документа:
Kirensky Institute of Physics SB RAS, Akademgorodok 50, Bld. 38, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Materials Center Leoben Forschung GmbH, Rosegger-Stra?e 18, Leoben, Austria
Institute of Electrophysics UB RAS, Amundsena Str. 106, Yekaterinburg, Russian Federation
Physics Department and IRIS Adlershof, Humboldt-Universita¨t zu Berlin, Zum Großen Windkanal 6, Berlin, Germany
Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Spitaler, J.; Kokorina, E. E.; Nekrasov, I. A.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Draxl, C.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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7.
Unidirectional Amplification and
Shaping of Optical Pulses by Three-Wave Mixing with Negative
Phonons
/ A. K. Popov [и др.]> //
The 4th International Conference on Metamaterials, Photonic Crystals and Plasmonics (META’13) : Proceedings. - 2013. - P. 35-40. - Библиогр.: 30 назв.
Аннотация:
A possibility to greatly enhance frequency-conversion efficiency of stimulated Raman scattering is shown by making use of extraordinary properties of three-wave mixing of ordinary and backward waves. Such processes are commonly attributed to negative-index plasmonic metamaterials. This work demonstrates the possibility to replace such metamaterials that are very challenging to engineer by readily available crystals which support elastic waves with contradirected phase and group velocities. The main goal of this work is to investigate specific properties of indicated nonlinear optical process in short pulse regime and to show that it enables elimination of fundamental detrimental effect of fast damping of optical
phonons
on the process concerned. Among the applications is the possibility of creation of a family of unique photonic devices such as unidirectional Raman amplifiers and femtosecond pulse shapers with greatly improved operational properties.
Материалы конференции
,
Материалы конференции
Доп.точки доступа:
Popov, A. K.; Shalaev, M. I.; Шалаев, Михаил Игоревич; Myslivets, S. A.; Мысливец, Сергей Александрович; Slabko, V. V.; Слабко, Виталий Васильевич; International Conference on Metamaterials, Photonic Crystals and Plasmonics(4 ; 2013 ; March ; 18-22 ; Sharjah, United Arab Emirates)
}
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8.
Raman Scattering Study
Temperature Phase Transitions of Rb2KInF6 Crystal / A. S. Krylov [et al.]> // Ferroelectrics. - 2011. -
Vol. 416
. - P. 95-100,
DOI
10.1080/00150193.2011.577713. - Cited References: 9. - Authors wish to thank prof. K. S. Aleksandrov and prof. I. N. Flerov for their valuable support and useful discussions. This work has been financially supported by grants RFFBR 08-02-00066, 09-02-00062, SS-1011.2008.2. . - ISSN 0015-0193
РУБ
Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
LIGHT-SCATTERING
LATTICE-DYNAMICS
OPTICAL
PHONONS
ELPASOLITE
RB2KSCF6
Кл.слова (ненормированные):
Rb2KInF6
--
temperature phase transitions
--
Raman scattering
--
lattice dynamics
Аннотация:
Raman scattering spectra of Rb2KInF6 crystal have been studied in a wide temperature range, including two phase transitions: from cubic to tetragonal, and then - to the monoclinic phase. Hardening of soft phonon modes was observed that attributes them to the transitions of displacive type. Parameters of Raman lines have been quantitatively analyzed and found in good agreement with known thermodynamic characteristics of these transitions. No evidences of order - disorder processes were observed in the Raman spectra of the high-symmetry phase.
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Держатели документа:
[Krylov, A. S.
Krylova, S. N.
Vtyurin, A. N.
Voronov, V. N.
Oreshonkov, A. S.] Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Voronov, V. N.; Воронов, Владимир Николаевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич
}
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9.
Raman spectra and
phase transitions in the Rb2KScF6 elpasolite / A. S. Krylov [et al.]> //
Ferroelectrics. - 2003. -
Vol. 284
. - P. 221-238,
DOI
10.1080/00150190390204709. - Cited References: 13 . - ISSN 0015-0193
РУБ
Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
LIGHT-SCATTERING
OPTICAL
PHONONS
MODE
Кл.слова (ненормированные):
Rb2KScF6
--
phase transitions
--
Raman scattering
--
soft modes
Аннотация:
Raman spectra of Rb2KScF6 elpasolite crystal have been studied in a wide temperature range, including two transition points: from cubic to tetragonal, and then-to the monoclinic phase. For the first time both for this crystal and for fluoride elpasolites in general soft modes restoration has been found below transition points; in agreement with selection rules a splitting of degenerate modes has been observed as well both for lattice vibrations and internal modes of ScF6 octahedrons. Parameters of Raman lines have been quantitatively analyzed and found in good agreement with known thermodynamic characteristics of these transitions; in particular, lines widths are shown to be determined by tree-
phonons
anharmonic interactions. A wide region of pretransitional fluctuations was found above the upper transition point.
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Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Bulou, A.; Voronov, V. N.; Воронов, Владимир Николаевич; Russian-CIS-Baltic-Japanese symposium on ferroelectricity(7 ; 2002 ; Jun ; 24-28 ; St.-Petersburg)
}
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10.
Рогинский, Е. М.
Неэмпирические подходы при изучении фазовых переходов и барическое поведение фононов в молекулярных кристаллах / Е. М. Рогинский, А. С. Крылов, Ю. Ф. Марков> // Наноматер. и нанострукт. - XXI век. - 2015. -
Т. 6
,
№ 2
. - С. 21-27. - Библиогр.: 12 . - ISSN 2225-0999
Перевод заглавия:
Ab initio approaches used by phase transition study and
phonons
pressure behaviour in molecular crystals
Кл.слова (ненормированные):
ab initio
--
фононы
--
сегнетоэластики
--
фазовые переходы
--
раман-спектроскопия
--
динамика решетки
--
phonon
--
ferroelastics
--
phase transition
--
Raman spectra
--
lattice dynamics
Аннотация:
При изучении барического поведения фононного спектра кристаллов Hg2Cl2 были предсказаны теоретически и обнаружены экспериментально в низкосимметричной, ромбической фазе мягкие моды из различных высокосимметричных точек зоны Бриллюэна (ЗБ), частоты которых уменьшается при повышении давления. В раман спектрах наблюдается мягкий фонон, который смягчается вплоть до критического давления c = 9,2 ГПа, выше которого полностью исчезает, что свидетельствует в пользу второго структурного фазового перехода, обнаруженного в настоящей работе, в кристаллах Hg2Cl2. Показано, что в случае молекулярных или квазимолекулярных кристаллов для корректного описания электронной структуры важно учитывать дисперсионные дальнодействующие поправки функционала зарядовой плотности.
Under the study of phonon spectra pressure behaviour of Hg2Cl2 crystals the soft modes at the set of high-symmetry Brillouin zone(BZ) points was predicted theoretically and observed experimentally. The frequency of soft modes reduces under pressure. In the raman spectra soft mode at the center of BZ was observed and studied. The frequency of soft mode decrease at the hydrostatic pressure up to P c = 9.2 GPa and disappears at higher pressure in spectra. Such changes in spectra points to the existence of the second phase transition observed in the present work. It was shown that in the case of molecular crystals the long-range dispersion corrections of the electron density functional is required for a proper electronic structure description.
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,
РИНЦ
Держатели документа:
Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Крылов, Александр Сергеевич; Krylov, A. S.; Марков, Ю. Ф.; Markov Yu. F; Roginskii E. M.
}
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11.
Ovchinnikov, S. G.
The Interplay of Phonon and Magnetic Mechanism of Pairing in Strongly Correlated Electron System of High-T-c Cuprates / S. G. Ovchinnikov, E. I. Shneyder> // J. Supercond. Nov. Magn. - 2010. -
Vol. 23
,
Is. 5
. - P. 733-736,
DOI
10.1007/s10948-009-0633-z. - Cited References: 26. - This work is supported by the Presidium RAS program N 7 "Quantum physics of condensed matter," the integration project SORAN-UrORAN N 40, and the RFFI Grant 09-02-00127. . - ISSN 1557-1939
РУБ
Physics, Applied + Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
OXIDE SUPERCONDUCTORS
SYMMETRY
COPPER
MODEL
BAND
BI2SR2CACU2O8+DELTA
LA2-XSRXCUO4
PB
Кл.слова (ненормированные):
High-T-c superconductivity
--
Strong correlated electron systems
--
Mechanisms of superconducting pairing
--
High-T c superconductivity
--
Mechanisms of superconducting pairing
--
Strong correlated electron systems
--
Ab initio
--
Buckling mode
--
Correlated electron systems
--
Critical temperatures
--
Cuprates
--
Fitting parameters
--
High-T
--
Isotope effect
--
Low energies
--
Magnetic mechanisms
--
Order of magnitude
--
Phonon mode
--
Strongly correlated electron system
--
Strongly correlated electrons
--
Superconducting pairing
--
Superconductivity mechanism
--
Type theory
--
Buckling
--
Copper compounds
--
Electrons
--
Isotopes
--
Magnetic materials
--
Phonons
--
Superconductivity
--
Superconducting magnets
Аннотация:
We consider magnetic mechanism of superconducting pairing in the effective low energy t - t' - t '' - J* model with all parameters calculated ab initio. Interaction of strongly correlated electrons with different phonon modes is also incorporated. In a BCS type theory, the d(x2-y2) gap is given by a sum of magnetic and phonon contributions. The main contribution to the only fitting parameter G is determined by a competition of the breathing and buckling modes. Fitting the parameter G from the isotope effect, we obtain that magnetic and phonon contributions to the critical temperature T-c work together and are of the same order of magnitude.
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Держатели документа:
[Ovchinnikov, S. G.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, 660014 Krasnoyarsk, Russian Federation
Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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12.
Resonant Raman Scattering
and Dispersion of Polar Optical and Acoustic
Phonons
in Hexagonal InN / V. Y. Davydov [et al.]> // Semiconductors. - 2010. -
Vol. 44
,
Is. 2
. - P. 161-170,
DOI
10.1134/S1063782610020065. - Cited References: 19. - This study was supported by the Russian Foundation for Basic Research (project nos. 09-02-01280 and 08-02-92003-NNS) and by the program of the Russian Academy of Sciences "New Materials and Structures." . - ISSN 1063-7826
РУБ
Physics, Condensed Matter
Аннотация:
It is shown that a study of the dependence of impurity-related resonant first-order Raman scattering on the frequency of excitation light makes it possible to observe the dispersion of polar optical and acoustic branches of vibrational spectrum in hexagonal InN within a wide range of wave vectors. It is established that the wave vectors of excited
phonons
are uniquely related to the energy of excitation photon. Frequencies of longitudinal optical
phonons
E(1)(LO) and A(1)(LO) in hexagonal InN were measured in the range of excitation-photon energies from 2.81 to 1.17 eV and the frequencies of longitudinal acoustic
phonons
were measured in the range 2.81-1.83 eV of excitation-photon energies. The obtained dependences made it possible to extrapolate the dispersion of
phonons
A(1)(LO) and E(1)(LO) to as far as the point Gamma in the Brillouin zone and estimate the center-band energies of these
phonons
(these energies have not been uniquely determined so far).
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Держатели документа:
[Davydov, V. Yu.
Klochikhin, A. A.
Smirnov, A. N.
Strashkova, I. Yu.] Russian Acad Sci, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia
[Klochikhin, A. A.] Russian Acad Sci, BP Konstantinov Nucl Phys Inst, St Petersburg 350000, Russia
[Krylov, A. S.] Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Lu, Hai
Schaff, William J.] Cornell Univ, Dept Elect & Comp Engn, Ithaca, NY 14853 USA
[Lee, H-M.
Hong, Y. -L.
Gwo, S.] Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan
ИФ СО РАН
Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russian Federation
Konstantinov Nuclear Physics Institute, Russian Academy of Sciences, St. Petersburg 350000, Russian Federation
Kirensky Institute of Physics, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Department of Electrical and Computer Engineering, Cornell University, Ithaca, NY 14853, United States
Department of Physics, National Tsing-Hua University, Taiwan, China
Доп.точки доступа:
Davydov, V. Yu.; Klochikhin, A. A.; Smirnov, A. N.; Strashkova, I. Y.; Krylov, A. S.; Крылов, Александр Сергеевич; Lu, H.; Schaff, W. J.; Lee, H. M.; Hong, Y. L.; Gwo, S.
}
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13.
Lattice dynamics and
ferroelectric instability in ordered and disordered PbSc1/2Ta1/2O3 and PbSc1/2Nb1/2O3 solid solutions / V. I. Zinenko [et al.]> // J. Exp. Theor. Phys. - 2007. -
Vol. 105
,
Is. 3
. - P. 617-625,
DOI
10.1134/S1063776107090191. - Cited References: 23 . - ISSN 1063-7761
Кл.слова (ненормированные):
Dipole moment
--
Lattice vibrations
--
Negative ions
--
Phonons
--
Positive ions
--
Solid solutions
--
Dynamic Born charges
--
Ferroelectric instabilities
--
Frequency spectra
--
Gordon-Kim models
--
Oxygen anions
--
Phonon spectra
--
Ferroelectricity
Аннотация:
The dynamic Born charges and the frequency spectra of lattice oscillations in the crystals of ordered and disordered PbSc1/2Ta1/2O3 (PST) and PbSc1/2Nb1/2O3 (PSN) solid solutions have been calculated within the framework of the generalized Gordon-Kim model with allowance for the dipole and quadrupole polarizabilities. The phonon spectra of both compounds contain ferroelectric soft modes. The influence of various interactions on the magnitude of dynamic charges and ferroelectric instability in PSN and PST solid solutions has been studied and it is shown that both these charges and the ferroelectric instability are determined by the competition between long-range dipole-dipole interactions and short-range dipole-charge interactions, the determining role played by the interaction of Nb (Ta) cations and oxygen anions in the Nb-O (Ta-O) bond direction.
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Публикация на русском языке
Динамика решетки и сегнетоэлектрическая неустойчивость в упорядоченных и неупорядоченных твердых растворах РbSc1/2 Ta1/2 O3 и PbSc1/2 Nb1/2 0 3 [Текст] / В. И. Зиненко, Н. Г. Замкова, Е. Г. Максимов, С. Н. Софронова // Журн. эксперим. и теор. физ. - Москва : Наука, 2007. - Т. 132 № 3. - С. 702-711
Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Lebedev Physical Institute, Russian Academy of Sciences, Moscow 119991, Russian Federation
Доп.точки доступа:
Zinenko, V. I.; Зиненко, Виктор Иванович; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Maksimov, E. G.; Sofronova, S. N.; Софронова, Светлана Николаевна
}
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14.
Zinenko, V. I.
Lattice dynamics and the phase transition from the cubic phase to the tetragonal phase in the LaMnO3 crystal within the polarizable-ion model / V. I. Zinenko, M. S. Pavlovskii> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 9
. - P. 1749-1758,
DOI
10.1134/S1063783407090235. - Cited References: 23 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
NEUTRON-DIFFRACTION
PEROVSKITES
MANGANITES
PHONONS
Аннотация:
The paper reports on the results of ab initio calculations of the static and dynamic properties of the LaMnO3 crystal with a perovskite structure in the cubic, rhombohedral, and orthorhombic phases. The calculations are performed within the ionic crystal model, which takes into account the deformability and polarizability of the ions. It is revealed that the spectrum of lattice vibrations in the cubic phase contains unstable vibrational modes, which occupy the phase space in the entire Brillouin zone. The eigenvectors of the softest mode at the boundary point R of the Brillouin zone are associated with the displacements of the oxygen ions and correspond to the "rotation" of the MnO6 octahedron. The condensation of one, two, and three components of this mode leads to the tetragonal, orthorhombic, and rhombohedral distortions of the structure. The structural phase transition is described in terms of the local mode approximation with the use of the double perovskite unit cell, in which the MnO6 octahedron is explicitly separated. The parameters of the model Hamiltonian are determined. The static properties are investigated by the Monte Carlo method. The calculated temperature of the phase transition from the cubic phase (9800 K) is considerably higher than the melting temperature of the crystal under investigation. The calculated frequencies of long-wavelength lattice vibrations in the experimentally observed orthorhombic and rhombohedral phases are in reasonable agreement with experimental data.
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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Pavlovskii, M. S.; Павловский, Максим Сергеевич; Зиненко, Виктор Иванович
}
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15.
Raman scattering study
of ordering processes and phase transitions in A(2)BWO(3)F(3) oxyfluorides crystals / A. N. Vtyurin [et al.] ; ed. B Perrin [et al.]> // 12TH INTERNATIONAL CONFERENCE ON PHONON SCATTERING IN CONDENSED MATTER (
PHONONS
2007). Ser. Journal of Physics Conference Series : IOP PUBLISHING LTD, 2007. -
Vol. 92
: 12th International Conference on Phonon Scattering in Condensed Matter (
PHONONS
2004) (JUL 15-20, 2007, Paris, FRANCE). - Ст. 12158,
DOI
10.1088/1742-6596/92/1/012158. - Cited References: 6 . - ISBN 1742-6588
РУБ
Physics, Condensed Matter
Рубрики:
(NH4)(3)WO3F3
Аннотация:
Raman spectra of perovskite-like (NH(4))(3)WO(3)F(3), (NH(4))(2)KWO(3)F(3) and Cs(2)(NH(4))WO(3)F(3) oxyfluorides are obtained in a wide temperature range including transition points. Transition anomalies are found and analyzed. Transformation in (NH(4))(3)WO(3)F(3) is shown to be bound with octahedron groups ordering and strong distortion of ammonium ions due to H-bond formation, that is accompanied by cell volume multiplication, hardening and formation of complex discrete low frequency lattice spectrum. Same cell doubling was found in (NH(4))(2)KWO(3)F(3), but without lattice ordering Cs(2)(NH(4))WO(3)F(3) lattice stays disordered down to 15 K.
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Держатели документа:
[Vtyurin, A. N.
Krylov, A. S.
Gerasimova, J. V.
Fokina, V. D.
Kocharova, A. G.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institute of Chemistry, 690022 Vladivostok, Russian Federation
Institute of Automation and Electrometry, 630090 Novosibirsk, Russian Federation
Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimova, J. V.; Герасимова, Юлия Валентиновна; Fokina, V. D.; Фокина, Валентина Дмитриевна; Kocharova, A. G.; Кочарова, Алла Георгиевна; Laptash, N. M.; Voyt, E. I.; Surovtsev, N. V.; Perrin, B. \ed.\; Bonello, B. \ed.\; Devos, A. \ed.\; Duquesne, JY. \ed.\; Duquesne,, Y. \ed.\
}
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16.
Zamkova, N. G.
Lattice dynamics and ferroelectric phase transitions in solid solutions PbSc(1/2)Nb(1/2)O(3) and PbSc(1/2)Ta(1/2)O(3) / N. G. Zamkova, V. I. Zinenko ; ed. B Perrin [et al.]> // 12TH INTERNATIONAL CONFERENCE ON PHONON SCATTERING IN CONDENSED MATTER (
PHONONS
2007). Ser. Journal of Physics Conference Series : IOP PUBLISHING LTD, 2007. -
Vol. 92
: 12th International Conference on Phonon Scattering in Condensed Matter (
PHONONS
2004) (JUL 15-20, 2007, Paris, FRANCE). - Ст. 12162,
DOI
10.1088/1742-6596/92/1/012162. - Cited References: 14 . - ISBN 1742-6588
РУБ
Physics, Condensed Matter
Рубрики:
PEROVSKITES
BATIO3
Аннотация:
The calculation of the lattice dynamics and ferroelectric phase transitions for disordered and ordered solid solution PbSc(1/2)Nb(1/2)O(3) and PbSC(1/2)Ta(1/2)O(3) in the framework of the Gordon-Kim model are performed. The unstable ferroelectric modes were found in all cases. The model Hamiltonian for the study finite temperature behavior during for the ferroelectric phase transition is used. The transition temperatures, phase sequences and spontaneous polarizations are calculated by Monte-Carlo method.
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Держатели документа:
[Zamkova, N. G.
Zinenko, V. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Akademgorodok, Russia
ИФ СО РАН
L v Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Доп.точки доступа:
Zinenko, V. I.; Зиненко, Виктор Иванович; Perrin, B. \ed.\; Bonello, B. \ed.\; Devos, A. \ed.\; Duquesne, JY. \ed.\; Duquesne, Y. \ed.\; Замкова, Наталья Геннадьевна
}
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17.
Ovchinnikov, S. G.
Effective Hamiltonian for HTSC cuprates taking into account electron-phonon interaction in the strong-correlation regime / S. G. Ovchinnikov, E. I. Shneider> // J. Exp. Theor. Phys. - 2005. -
Vol. 101
,
Is. 5
. - P. 844-855,
DOI
10.1134/1.2149064. - Cited References: 38. - This work was supported by the Russian Foundation for Basic Research (project no. 03-02-16124), the program “Quantum Macrophysics” of the Presidium of the Russian Academy of Sciences, the Foundation in Support for Russian Science, the Foundation of Noncommercial . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
D-WAVE SUPERCONDUCTIVITY
T-C
DISPERSION
SCATTERING
OXIDES
STATE
MODEL
Кл.слова (ненормированные):
Electron beams
--
Electronic structure
--
Optimization
--
Phonons
--
Electron correlations
--
Hubbard X operators
--
Spin-photon interaction
--
Hamiltonians
Аннотация:
Electron-phonon interaction is sequentially derived from a realistic p-d multiband model for the cuprates under conditions of strong electron correlations. The electronic structure is described using the representation of the Hubbard X operators in a generalized tight-binding method. Dependences of the diagonal and off-diagonal (on lattice sites) matrix elements of electron-phonon interaction on the wavevectors are found for three phonon modes, namely, breathing, apical breathing, and bending modes. The interactions of the breathing and bending modes with electrons are shown to contribute to the formation of kinks in the (0; 0)-(pi; pi) and (0; 0)-(pi; 0) directions, respectively. A low-energy t-J* model with
phonons
is developed; apart from electron-phonon interaction, it also includes spin-phonon interaction. The elimination of
phonons
gives an effective electron-electron interaction that depends on the occupation number of a multielectron term and on the carrier concentration due to strong electron correlations. (c) 2005 Pleiades Publishing, Inc.
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Публикация на русском языке
Овчинников, Сергей Геннадьевич. Эффективный гамильтониан для ВТСП-купратов с учетом электрон-фононного взаимодействия в режиме сильных корреляций [Текст] / С. Г. Овчинников, Е. И. Шнейдер // Журнал экспериментальной и теоретической физики. - 2005. - Т. 128 Вып. 5. - С. 974-986
Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Доп.точки доступа:
Shneider, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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18.
Aplesnin, S. S.
Two-dimensional quantum spin liquid with S=1/2 spins interacting with acoustic
phonons
/ S. S. Aplesnin> // Phys. Lett. A. - 2004. -
Vol. 333
,
Is. 5-6
. - P. 446-449,
DOI
10.1016/j.physleta.2004.10.064. - Cited References: 11 . - ISSN 0375-9601
РУБ
Physics, Multidisciplinary
Рубрики:
ANTIFERROMAGNET
Кл.слова (ненормированные):
spin-phonon interactions
--
spin-liquid
--
spinon excitations
--
Spin-liquid
--
Spin-phonon interactions
--
Spinon excitations
--
ferromagnetic material
--
acceleration
--
acoustics
--
article
--
density
--
energy
--
liquid
--
magnetic field
--
mathematical analysis
--
Monte Carlo method
--
phonon
--
quantum mechanics
Аннотация:
The spin density of states of a two-dimensional antiferromagnet in magnetic field having spins-1/2 and interacting with acoustic
phonons
is investigated in the nonadiabatic approximation using the quantum Monte Carlo method. It is found the gap energy A in the single particle spin excitations spectrum closes at magnetic field Delta similar or equal to H-c, W-ph
W-s, where W-ph and W-s are the bandwidths of phonon and spin excitations in antiferromagnet. (C) 2004 Elsevier B.V All rights reserved.
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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirenskii Institute of Physics, Siberian Br. Russ. Acad. of Sci., Krasnoyarsk 660036, Russia, Russian Federation
Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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19.
Lattice dynamics and
raman scattering spectrum of elpasolite Rb2KScF6: Comparative analysis / S. N. Krylova [et al.]> // Phys. Solid State. - 2004. -
Vol. 46
,
Is. 7
. - P. 1311-1319,
DOI
10.1134/1.1778457. - Cited References: 18 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITION
LIGHT-SCATTERING
OPTICAL
PHONONS
SOFT-MODE
CRYSTAL
Аннотация:
Raman scattering spectra of elpasolite Rb2KScF6 are studied in a wide temperature range including two phase transitions: from the cubic to the tetragonal phase and then to the monoclinic phase. The experimental Raman scattering spectrum is compared with the lattice vibration spectra of these phases calculated using an ab initio approach. A number of anomalies (caused by structural rearrangement during the phase transitions) are revealed and quantitatively analyzed in the ranges of both the intramolecular vibrations of the octahedron molecular ScF6 ions and low-frequency intermolecular lattice vibrations. The interaction between low-frequency intramolecular vibrations and the intermolecular modes is found to be significant, and strong resonance interaction of the rotational soft modes (which are recovered below the phase transition points) with hard low-frequency vibrations of the rubidium ion sublattice is detected. These interactions are shown to substantially complicate the spectra. (C) 2004 MAIK "Nauka / Interperiodica".
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Univ Maine, F-72085 Le Mans 9, France
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Universite du Maine, Le Mans, Cedex 9, 72085, France
Доп.точки доступа:
Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Bulou, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Zamkova, N. G.; Замкова, Наталья Геннадьевна
}
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20.
Zinenko, V. I.
The nonempirical calculation of the cation ordering and lattice dynamics in the solid solutions of PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3 / V. I. Zinenko, S. N. Sofronova ; ed.: A Kaplyanskii, A Akimov, Akimov,> // 11th International Conference on Phonon Scattering in Condensed Matter (
PHONONS
2004) (JUL 25-30, 2004, St Petersburg, RUSSIA) : WILEY-V C H VERLAG GMBH, 2004. - P. 3047-3051,
DOI
10.1002/pssc.200405286. - Cited References: 10 . - ISBN 3-527-40588-7
РУБ
Physics, Condensed Matter
Аннотация:
An effective Hamiltonian for the study of Sc-Nb(Ta) cation ordering in PbSc1/2Nb(Ta)(1/2)O-3 solid solutions is written out. To determine the parameters of the effective Hamiltonian, a nonempirical calculation is performed within an ionic-crystal model taking into account the deformation, dipole and quadrupole polarizabilities of ions. The phase transition temperatures are calculated by mean field, cluster approximations and Monte-Carlo method. Within the same ionic-crystal model, we calculated the high-frequency permittivity, Born dynamic charges, and the phonon spectrum for a completely disordered and ordered phases. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Akademgorokok, Russia
ИФ СО РАН
Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Зиненко, Виктор Иванович
}
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