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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Makarov I. A., Ovchinnikov S. G.
Заглавие : Effect of electron-phonon interaction on the doping and temperature depended spectral function in cuprates
Коллективы : International Conference on Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity, Superstripes 2017. Quantum in Complex Matter: Superconductivity, Magnetism and Ferroelectricity
Место публикации : Superstripes 2017: [absrtacts]/ ed. A. Bianconi: Superstripes press, 2017. - Ст.37.1. - P.206. - (Science Series; Vol. 11). - ISBN 9788866830696
Аннотация: The generalized tight binding (GTB) method to calculate the electronic structure of strongly correlated electrons in cuprates is modified to incorporate also strong electronphonon interaction. By exact diagonalization of the p-d- Holstain model Hamiltonian for a separate CuO6 unit cell we find the multelectron and multiphonon local eigenstates that are used to construct a set of local Hubbard operators. Then we treat the intercell electron hopping t by the perturbation approach over small ratio t/U, where U is the charge transfer excitation energy. Without electron-phonon interaction we obtain the band of spin polaron and a set of local multiphonon Franck-Condon excitations. The electron-phonon interaction results in the hybridization of spin polaron and Franck Condon excitations that forms the polaronic band structure with strong temperature dependence. The temperature dependence of the polaronic band structure and Fermi surface is discussed. The peak of a spectral function at the top of the valence band has large width typical to the ARPES data and determined by a large number of the multiphonon excitations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pavlovskiy M. S., Shaykhutdinov K. A., Wu L. S., Ehlers G., Temerov V. L., Gudim I. A., Shinkorenko A. S., Podlesnyak A.
Заглавие : Observation of soft phonon mode in TbFe3(BO3)4 by inelastic neutron scattering
Коллективы : Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-243039]
Место публикации : Phys. Rev. B. - 2018. - Vol. 97, Is. 5. - Ст.054313. - ISSN 2469-9950, DOI 10.1103/PhysRevB.97.054313. - ISSN 2469-9969(eISSN)
Примечания : Cited References:40. - This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. L.S.W. was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US DOE. The work was funded by RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund according to Research Project No. 16-42-243039.
Предметные рубрики: STRUCTURAL PHASE-TRANSITIONS
SINGLE-CRYSTAL
SPECTROSCOPY
Аннотация: The phonon dispersion in terbium iron borate TbFe3(BO3)4 has been measured by inelastic neutron scattering in a temperature range 180˂T˂350 K through the displacive structural transition at TS=192.5K and studied by ab initio calculations. Significant, but not complete, softening of the transverse acoustic (TA) branch has been observed at the corner of the Brillouin zone (Λ point) at temperatures T⪆TS, in full agreement with theoretical calculations. The TA soft mode undergoes considerable broadening at the Λ point near the transition temperature that can be attributed to the anharmonic interference between transverse acoustic and optical modes.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Makarov I. A., Ovchinnikov S. G., Shneyder E. I.
Заглавие : Temperature dependent polaronic band structure in the 3band P-D model with strong electron-phonon interaction
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4TL-P-1. - P.696 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Stanislavchuk T. N., Sirenko A. A., Kamenskyi D., Bezmaternykh L. N., Popova M. N.
Заглавие : Bifurcations of coupled electron-phonon modes in an antiferromagnet subjected to a magnetic field
Место публикации : Phys. Rev. Lett.: American Physical Society, 2017. - Vol. 118, Is. 16. - Ст.167203. - ISSN 00319007 (ISSN), DOI 10.1103/PhysRevLett.118.167203
Примечания : Cited References: 26. - This research was supported by the Russian Scientific Foundation under Grant No. 14-12-01033, the President of Russian Federation (MK-3577.2017.2, K. N. B.), and the U.S. Department of Energy under Grant No. DE-FG02-07ER46382 (experiments at U4-IR beam line NSLS-BNL, T. N. S. and A. A. S.). The National Synchrotron Light Source is operated as a user facility for the U.S. Department of Energy under Contract No. DE-AC02-98CH10886. Part of this work was supported by EMFL (Contract No. 26211). M. N. P. thanks B. Z. Malkin and A. V. Popov for helpful discussions.
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--bifurcation (mathematics)--electron-phonon interactions--electrons--magnetic fields--magnetism--temperature--antiferromagnetic crystals--bifurcation points--electron phonon couplings--electronic excitation--external magnetic field--field independents--low temperatures--reflection spectra--phonons
Аннотация: We report on a new effect caused by the electron-phonon coupling in a stoichiometric rare-earth antiferromagnetic crystal subjected to an external magnetic field, namely, the appearance of a nonzero gap in the spectrum of electronic excitations in an arbitrarily small field. The effect was registered in the low-temperature far-infrared (terahertz) reflection spectra of an easy-axis antiferromagnet PrFe3(BO3)4 in magnetic fields Bext-c. Both paramagnetic and magnetically ordered phases (including a spin-flop one) were studied in magnetic fields up to 30 T, and two bifurcation points were observed. We show that the field behavior of the coupled modes can be successfully explained and modeled on the basis of the equation derived in the framework of the theory of coupled electron-phonon modes, with the same field-independent electron-phonon interaction constant |W|=14.8 cm-1. © 2017 American Physical Society.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Makarov I. A., Kozlov P. A.
Заглавие : Multiphonon contribution to the polaron formation in cuprates with strong electron correlations and strong electron-phonon interaction
Коллективы : Oxide-Based Materials and Devices
Место публикации : Proceedings of SPIE - The International Society for Optical Engineering: SPIE, 2017. - Vol. 10105. - , DOI 10.1117/12.2266799
Примечания : Cited References: 17. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support.
Ключевые слова (''Своб.индексиров.''): high-temperature superconductivity--cuprates--strong electronic correlations--cluster form of perturbation theory--hubbard operator--three-band p-d model--electron-phonon interaction--polaron--franck-condon broadening
Аннотация: In this work dependences of the electron band structure and spectral function in the HTSC cuprates on magnitude of electron-phonon interaction (EPI) and temperature are investigated. We use three-band p-d model with diagonal and offdiagonal EPI with breathing and buckling phonon mode in the frameworks of polaronic version of the generalized tight binding (GTB) method. The polaronic quasiparticle excitation in the system with EPI within this approach is formed by a hybridization of the local multiphonon Franck-Condon excitations with lower and upper Hubbard bands. Increasing EPI leads to transfer of spectral weight to high-energy multiphonon excitations and broadening of the spectral function. Temperature effects are taken into account by occupation numbers of local excited polaronic states and variations in the magnitude of spin-spin correlation functions. Increasing the temperature results in band structure reconstruction, spectral weight redistribution, broadening of the spectral function peak at the top of the valence band and the decreasing of the peak intensity. The effect of EPI with two phonon modes on the polaron spectral function is discussed. © 2017 SPIE.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang, Xingxing, Wang, Naizheng, Molokeev M. S., Wang, Wei, Guo, Shibin, Huang, Rongjin, Li, Laifeng, Hu, Zhanggui, Lin, Zheshuai
Заглавие : The anisotropic thermal expansion of non-linear optical crystal BaAlBO3F2 below room temperature
Место публикации : Front. Chem. - 2018. - Vol. 6. - Ст.252. - ISSN 2296-2646, DOI 10.3389/fchem.2018.00252
Примечания : Cited References: 31. - This work was supported by the National Scientific Foundations of China (Grants 11474292, 51702330, 11611530680, 91622118, and 91622124), Russian Foundation for Basic Research (Grant 17-52-53031), the Special Foundation of the Director of Technical Institute of Physics and Chemistry (TIPC) and the Youth Innovation Promotion Association, CAS (outstanding member for ZL and Grant 2017035 for XJ).
Предметные рубрики: LASER
GENERATION
PSEUDOPOTENTIALS
COEFFICIENTS
YAG
Ключевые слова (''Своб.индексиров.''): babf--anisotropic thermal expansion--phonon stimulation--nlo optical--property--low temperature
Аннотация: Thermal expansion is a crucial factor for the performance of laser devices, since the induced thermal stress by laser irradiation would strongly affect the optical beam quality. For BaAlBO3F2 (BABF), a good non-linear optical (NLO) crystal, due to the highly anisotropic thermal expansion its practical applications are strongly affected by the “tearing” stress with the presence of local overheating area around the laser spot. Recently, the strategy to place the optical crystals in low-temperature environment to alleviate the influence of the thermal effect has been proposed. In order to understand the prospect of BABF for this application, in this work, we investigated its thermal expansion behavior below room temperature. The variable-temperature XRD showed that the ratio of thermal expansion coefficient between along c- and along a(b)- axis is high as 4.5:1 in BABF. The Raman spectrum combined with first-principles phonon analysis revealed that this high thermal expansion anisotropy mainly ascribe to progressive stimulation of the respective vibration phonon modes related with the thermal expansion along a(b)- and c-axis. The good NLO performance in BABF can be kept below room temperature. The work presented in this paper provides an in-depth sight into the thermal expansion behavior in BABF, which, we believe, would has significant implication to the manipulation in atomic scale on the thermal expansion of the materials adopted in strong-field optical facility.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Roginskii E. M., Atuchin V. V.
Заглавие : New candidate to reach Shockley–Queisser limit: The DFT study of orthorhombic silicon allotrope Si(oP32)
Место публикации : J. Phys. Chem. Solids. - 2020. - Vol. 137. - Ст.109219. - ISSN 00223697 (ISSN), DOI 10.1016/j.jpcs.2019.109219
Примечания : Cited References: 44. - The authors are grateful for the support from RFBR , according to the research projects 18-03-00750 and 18-32-20011 . The computations were performed using the facilities of the Computational Center of the Research Park of St. Petersburg State University. This study was also supported by the Russian Science Foundation (project 19-42-02003 , in part of conceptualization).
Аннотация: In the present study, the unit cell parameters and atomic coordinates are predicted for the Pbcm orthorhombic structure of Si(oP32) modification. This new allotrope of silicon is mechanically stable and stable with respect to the phonon states. The electronic structure of Si(oP32) is calculated for LDA and HSE06 optimized structures. The band gap value Eg = 1.361 eV predicted for Si(oP32) is extremely close to the Shockley–Queisser limit and it indicates that the Si(oP32) modification is a promising material for efficient solar cells. The frequencies of Raman and Infrared active vibrations is calculated for allotrope Si(oP32).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Krylova S. N., Gudim I. A., Vtyurin A. N.
Заглавие : Soft modes in HoFe2.5Ga0.5(BO3)4 solid solution
Коллективы : European Meeting on Ferroelectricity , Russian Foundation for Basic Research GrantRussian Foundation for Basic Research (RFBR) [1802-00754]
Место публикации : Ferroelectrics. - 2020. - Vol. 556, Is. 1. - P.16-22. - ISSN 0015-0193, DOI 10.1080/00150193.2020.1713334. - ISSN 1563-5112(eISSN)
Примечания : Cited References: 14. - This work was supported by the Russian Foundation for Basic Research Grant No 1802-00754.
Предметные рубрики: RAMAN-SCATTERING
SPECTRA
HO1-XNDXFE3(BO3)(4)
Аннотация: The condensation of two soft modes has been found when studying the Raman spectra of the solid solution HoFe2.5Ga0.5(BO3)4 in the temperature range from 7 to 350 K. The first high-temperature soft mode is associated with the structural phase transition from the R32 phase to the P3121 phase. The second soft mode is related to the reveal of the phonon-magnon interaction during magnetic ordering in the crystal. The temperatures of the structural phase transition T1 = 266 K and the magnetic phase transition T2 = 28 K are established. Experimentally interaction between the structural phase transition order parameter fluctuations and the magnetic order parameter fluctuations was found.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tanwar, Manushree, Yogi, Priyanka, Lambora, Simran, Mishra, Suryakant, Saxena, Shailendra K., Sagdeo, Pankaj R., Krylov A. S., Kumar, Rajesh
Заглавие : Generalisation of phonon confinement model for interpretation of Raman line-shape from nano-silicon
Место публикации : Adv. Mater. Process. Technol. - 2018. - Vol. 4, Is. 2. - P.227-233. - ISSN 2374-068X, DOI 10.1080/2374068X.2017.1413527
Примечания : Cited References: 32. - This work was supported by the Department of Science and Technology (DST), Government of India; Science and Engineering Research Board.
Ключевые слова (''Своб.индексиров.''): silicon nanomaterial--raman line-shape--phonon--quantum confinement
Аннотация: A comparative analysis of two Raman line-shape functions has been carried out to validate the true representation of experimentally observed Raman scattering data for semiconducting nanomaterials. A modified form of already existing phonon confinement model (PCM) incorporates two basic considerations, phonon momentum conservation and shift in zone centre phonon frequency. After incorporation of the above mentioned two factors, a rather symmetric Raman line-shape is generated which is in contrary to the usual asymmetric Raman line-shapes obtained from nanostructured semiconductor. By fitting an experimentally observed Raman scattering data from silicon nanostructures, prepared by metal induced etching, it can be established that the Raman line-shape obtained within the framework of PCM is a true representative Raman line-shape of sufficiently low dimensions semiconductors.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shneyder E. I., Makarov I. A., Zotova M. V., Ovchinnikov S. G.
Заглавие : Influence of the diagonal and off-diagonal electron-phonon interactions on the formation of local polarons and their band structure in materials with strong electron correlations
Коллективы : Russian Foundation for Basic Research [16-02-00098]; Basic Research Program of the Presidium of the Russian Academy of Sciences [12]
Место публикации : J. Exp. Theor. Phys. - 2018. - Vol. 126, Is. 5. - P.683-698. - ISSN 1063-7761, DOI 10.1134/S1063776118050059. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 58. - We are grateful to V.I. Zinenko and V.A. Gavrichkov for useful discussions. This work was financially supported by the Russian Foundation for Basic Research (project no. 16-02-00098) and the Basic Research Program no. 12 of the Presidium of the Russian Academy of Sciences ("Fundamental Problems of High-Temperature Superconductivity").
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
D-WAVE SUPERCONDUCTIVITY
LATTICE
Аннотация: For systems with strong electron correlations and strong electron–phonon interaction, we analyze the electron–phonon interaction in local variables. The effects of the mutual influence of electron–electron and electron–phonon interactions that determine the structure of local Hubbard polarons are described. Using a system containing copper–oxygen layers as an example, we consider the competition between the diagonal and off-diagonal interactions of electrons with the breathing mode as the polaron band structure is formed within a corrected formulation of the polaron version of the generalized tight-binding method. The band structure of Hubbard polarons is shown to depend strongly on the temperature due to the excitation of Franck–Condon resonances. For an undoped La2CuO4 compound we have described the evolution of the band structure and the spectral function from the hole dispersion in an antiferromagnetic insulator at low temperatures with the valence band maximum at point (π/2, π/2) to the spectrum with the maximum at point (π, π) typical for the paramagnetic phase. The polaron line width at the valence band top and its temperature dependence agree qualitatively with angle-resolved photoemission spectroscopy for undoped cuprates.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Imasaka, Kotaro, Pisarev, Roman, V, Bezmaternykh L. N., Shimura, Tsutomu, Kalashnikova, Alexandra M., Satoh, Takuya
Заглавие : Excitation of multiple phonon modes in copper metaborate CuB2O4 via nonresonant impulsive stimulated Raman scattering
Коллективы : Japanese Society for Promotion of Sciences (JSPS) via the Short-Term Fellowship Program; JSPS KAKENHI [JP15H05454, JP26103004]; JSPS Core-to-Core Program (A. Advanced Research Networks); Russian Science Foundation [16-12-10456]
Место публикации : Phys. Rev. B. - 2018. - Vol. 98, Is. 5. - Ст.054303. - ISSN 2469-9950, DOI 10.1103/PhysRevB.98.054303. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 64. - We thank V. Yu. Davydov for help with the spontaneous Raman scattering experiments. A.M.K. acknowledges support from the Japanese Society for Promotion of Sciences (JSPS) via the Short-Term Fellowship Program for European and North-Americanyoung researchers during her stay at the University of Tokyo. T.S. was supported by JSPS KAKENHI (No. JP15H05454 and No. JP26103004) and JSPS Core-to-Core Program (A. Advanced Research Networks). R.V.P. acknowledges the support from the Russian Science Foundation (Grant No. 16-12-10456).
Предметные рубрики: SPIN-WAVE SPECTRUM
COHERENT PHONONS
OPTICAL MANIPULATION
Аннотация: The excitation of four coherent phonon modes of different symmetries is realized in copper metaborate CuB2O4 via impulsive stimulated Raman scattering (ISRS). The phonons are detected by monitoring changes in the linear optical birefringence using the polarimetric detection (PD) technique. We compare the results of the ISRS-PD experiment to the polarized spontaneous Raman scattering spectra. We show that agreement between the two sets of data obtained by these allied techniques in a wide phonon frequency range of 4-14 THz can be achieved by taking into account the symmetry of the phonon modes and corresponding excitation and detection selection rules. It is also important to account for the difference between incoherent and coherent phonons in terms of their contributions to the Raman scattering process. This comparative analysis highlights the importance of the ratio between the frequency of a particular mode, and the pump and probe spectral widths. We analytically demonstrate that the pump and probe pulse durations of 90 and 50 fs, respectively, used in our experiments limit the highest frequency of the excited and detected coherent phonon modes to 12 THz, and define their relative amplitudes.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Klimin S. A., Kashchenko M. A., Bezmaternykh L. N.
Заглавие : Spin-phonon and electron-phonon interactions in multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 evidenced by IR reflection spectroscopy
Коллективы : Russian Science Foundation [14-12-01033]; Swiss National Science Foundation (SNSF); Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva
Место публикации : J. Low Temp. Phys.: Springer/Plenum Publishers, 2016. - Vol. 185, Is. 5-6. - P.538-543. - ISSN 0022-2291, DOI 10.1007/s10909-016-1597-6. - ISSN 1573-7357(eISSN)
Примечания : Cited References:19. - The authors thank Alexey Kuzmenko and Marina Popova for fruitful discussions. This paper was supported by the Russian Science Foundation under Grant No. 14-12-01033, by the Swiss National Science Foundation (SNSF), and by the Science and Technology cooperation program "Switzerland-Russia" of the University of Geneva.
Предметные рубрики: PHASE-TRANSITIONS
GdFe3(BO3)4
CRYSTALS
SPECTRUM
Ключевые слова (''Своб.индексиров.''): multiferroics--ir-active phonons--spin-phonon interaction--coupled--electron-phonon mode
Аннотация: We study temperature-dependent polarized reflection spectra of multiferroic GdFe3(BO3)4 and TbFe3(BO3)4 single crystals. Signatures of spin–lattice interactions in both compounds and of a formation of the electron–phonon coupled mode in TbFe3(BO3)4 are discussed.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimov V. S., Ershov A. E., Gavrilyuk A. P., Karpov S. V., Agren H., Polyutov S. P.
Заглавие : Suppression of surface plasmon resonance in Au nanoparticles upon transition to the liquid state
Место публикации : Opt. Express: Optical Society of America, 2016. - Vol. 24, Is. 23. - P.26851-26856. - ISSN 10944087 (ISSN), DOI 10.1364/OE.24.026851
Примечания : Cited References: 24. - This work was performed within the State contract of the RF Ministry of Education and Science for Siberian Federal University for scientific research in 2014–2016 (Reference number 1792) and SB RAS Program No II.2P (0358-2015-0010). The numerical calculations were performed using the MVS-1000 M cluster at the Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): electron scattering--gold--lattice constants--liquids--melting--metal nanoparticles--nanoparticles--surface plasmon resonance--electron phonon couplings--experimental spectra--experimental values--gold nanoparticles--nonlinear optical response--plasmonic nanoparticle--relaxation constants--surface plasmon frequency--plasmons
Аннотация: Significant suppression of resonant properties of single gold nanoparticles at the surface plasmon frequency during heating and subsequent transition to the liquid state has been demonstrated experimentally and explained for the first time. The results for plasmonic absorption of the nanoparticles have been analyzed by means of Mie theory using experimental values of the optical constants for the liquid and solid metal. The good qualitative agreement between calculated and experimental spectra support the idea that the process of melting is accompanied by an abrupt increase of the relaxation constants, which depends, beside electronphonon coupling, on electron scattering at a rising number of lattice defects in a particle upon growth of its temperature, and subsequent melting as a major cause for the observed plasmonic suppression. It is emphasized that observed effect is fully reversible and may underlie nonlinear optical responses of nanocolloids and composite materials containing plasmonic nanoparticles and their aggregates in conditions of local heating and in general, manifest itself in a wide range of plasmonics phenomena associated with strong heating of nanoparticles. © 2016 Optical Society of America.
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kozlov P. A., Makarov I. A., Ovchinnikov S. G.
Заглавие : Transition Between Large and Small Polaron States in the Electronic Structure of HTSC Cuprates
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P2.11. - P.153. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 3
Ключевые слова (''Своб.индексиров.''): cuprates--strong electron correlations--electron-phonon interaction--polaron--franck-condon
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Shneyder E. I., Makarov I. A., Zotova M. V., Nikolaev S. V., Ovchinnikov S. G.
Заглавие : Effects of electron-phonon interaction in strongly correlated copper oxides systems within alternative versions of generalized tight-binding method
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.O2.1. - P.135. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 3. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support
Ключевые слова (''Своб.индексиров.''): electron-phonon interaction--strongly correlated electron systems
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Makarov I. A., Ovchinnikov S. G.
Заглавие : Doping dependence of the electronic structure of polaronic excitations in the HTSC cuprates
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P2.9. - P.151. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 1. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support
Ключевые слова (''Своб.индексиров.''): cuprates--strong electron correlations--electron-phonon interaction--polaron
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prosnikov M. A., Smirnov A. N., Davydov, V. Yu, Sablina K. A., Pisarev R. V.
Заглавие : Lattice and magnetic dynamics of a quasi-one-dimensional chain antiferromagnet PbFeBO4
Коллективы : Russian Science Foundation [16-12-10456]
Место публикации : J. Phys.: Condens. Matter: IOP Publishing, 2017. - Vol. 29, Is. 2. - Ст.025808. - ISSN 0953-8984, DOI 10.1088/0953-8984/29/2/025808. - ISSN 1361-648X(eISSN)
Примечания : Cited References:32. - This research was supported by the Russian Science Foundation, grant No. 16-12-10456.
Предметные рубрики: LIGHT-SCATTERING
DIELECTRIC-PROPERTIES
RAMAN-SPECTROSCOPY
Ключевые слова (''Своб.индексиров.''): raman scattering--spin and phonon excitations--spin-phonon interaction--antiferromagnetism--magnetic symmetry analysis--two-magnon scattering
Аннотация: A group of recently synthesized orthorhombic Pnma crystals PbMBO4 (M = Cr, Mn, Fe) demonstrates a number of unusual structural and magnetic properties. We report on polarized Raman scattering study of the lattice and magnetic dynamics in single crystals of an antiferromagnet PbFeBO4 below and above T-N = 114 K. Polarization properties of the observed magnetic excitations below T-N as well as intense quasi-elastic scattering support the quasi-one-dimensional character of the magnetic structure of PbFeBO4. Frequency overlapping of magnetic excitations and low-frequency phonons in the range of 90-200 cm-1 leads to pronounced asymmetric anomalies thus confirming intrinsic coupling of magnetic and lattice subsystems. This conclusion is also supported by observation of anomalous temperature behaviour of higher frequency phonons in the vicinity of T-N. Experimental investigations are supported by relevant magnetic symmetry analysis which allows us to explain previously observed anomalous results.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarov I. A., Ovchinnikov S. G.
Заглавие : Cooperative effect of doping and temperature on the polaronic band structure in strongly correlated electron systems with strong electron-phonon interaction [Electronic resource]
Место публикации : ArXiv. - 2016. - Ст.1612.02781
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 22. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support.
Аннотация: In this work we investigate doping and temperature dependences of electronic structure of system with strong electronic correlations and strong electron-phonon interaction modeling cuprates in the frameworks of the three-band p-d-Holstein model by a polaronic version of the generalized tight binding (GTB) method. Within this approach the electronic structure is formed by polaronic quasiparticles constructed as excitations between initial and final polaronic multielectron states. Doping and temperature effects are taken into account by occupation numbers of local excited polaronic states and variations in the magnitude of spin-spin correlation functions. Both effects are manifested in the reconstruction of band structure, Fermi contours, density of states and redistribution of the spectral weight over the Hubbard polaron subbands. Doping leads to transformation of Fermi contour from small hole pockets around k=(π/2,π/2) with inhomogeneous spectral weight distribution at small hole concentration to large contour around k=(π,π) in the overdoped compound as a result of two quantum phase transitions. In the system with phonon subsystem and EPI doping results in the top of the valence band splitting off and new polaron subbands appearance. Temperature increasing in the system with doped holes and moderate EPI leads to formation of the flatband around k=(π,π) and transfer of the spectral weight to the splitted off top of the valence band.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarov I. A., Ovchinnikov S. G.
Заглавие : Temperature dependence of the polaronic band structure in strongly correlated electron systems with strong electron-phonon interaction [Electronic resource]
Место публикации : ArXiv. - 2016. - Ст.1611.05836
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 41. - Authors are thankful to Russian Science Foundation (project No. 14-12-00061) for financial support.
Аннотация: In this work we investigate temperature dependence of electronic structure of system with strong electronic correlations and strong electron-phonon interaction modeling cuprates in the frameworks of the three-band p-d-Holstein model by a polaronic version of the generalized tight binding (GTB) method. Within this approach the electronic structure is formed by polaronic quasiparticles constructed as excitations between initial and final polaronic multielectron states. Temperature effect is taken into account by occupation numbers of local excited polaronic states and variations in the magnitude of spin-spin correlation functions and it is manifested in the redistribution of the spectral weight over the Hubbard polaron subbands, and the temperature dependent band structure. Temperature increasing leads to broadening of the spectral function peak at the top of the valence band, shift of the peak, the decreasing of the peak intensity, the growth of bandwidth and reduction of the insulator energy gap. These effects are in a qualitative agreement to the temperature dependence of the ARPES spectra observed in the undoped HTSC cuprates.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Roginskii E. M., Krylov A. S., Markov Y. F., Smirnov M. B.
Заглавие : Lattice dynamics and baric behavior of phonons in Hg2Cl2 crystals at high hydrostatic pressures
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2016. - Vol. 80, Is. 9. - P.1033-1037. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873816090409
Примечания : Cited References: 12
Ключевые слова (''Своб.индексиров.''): chlorine compounds--crystal lattices--density functional theory--hydraulics--hydrostatic pressure--inorganic compounds--density functionals--high hydrostatic pressure--intermolecular interactions--orthorhombic phase--phonon spectrum--range dispersion--structural phase transition--theoretical modeling--phonons
Аннотация: A theoretical model based on long-range dispersion corrections of the charge density functional is proposed for model Hg2Cl2 calomel crystals, typical representatives of molecular inorganic compounds where the intermolecular interaction is found to play an important role. This model successfully describes the electronic state and the phonon spectrum of the above crystal, predicts the earlier unstudied phase transition at high hydrostatic pressure. Study of the baric behavior of the phonon spectrum with Raman spectroscopy observes the soft mode in the low-symmetry orthorhombic phase with the frequency softening as the pressure rises. Pressures above 9 GPa considerably transform the Raman spectra, indicating a structural phase transition. © 2016, Allerton Press, Inc.
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