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Aplesnin, S. S.
Nonadiabatic interaction of acoustic phonons with spins S=1/2 in the two-dimensional Heisenberg model / S. S. Aplesnin // J. Exp. Theor. Phys. - 2003. - Vol. 97, Is. 5. - P. 969-977, DOI 10.1134/1.1633952. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
QUANTUM MONTE-CARLO
   EU2CUO4
   GD2CUO4
   POLARON
Кл.слова (ненормированные):
Antiferromagnetic materials -- Correlation methods -- Crystal symmetry -- Magnetic couplings -- Magnetic moments -- Magnetization -- Monte Carlo methods -- Quantum theory -- Acoustic phonons -- Nonadiabatic interaction -- Orthorhombicity -- Quantum spin liquid transitions -- Phonons
Аннотация: The ground state of a two-dimensional antiferromagnet having spins S = 1/2 and interacting with acoustic phonons is investigated in the nonadiabatic approximation using the quantum-mechanical Monte Carlo method. The critical parameters of the spin-phonon coupling, corresponding to the formation of bound spin-phonon excitations, crystal symmetry lowering, and the emergence of a gap in the spin excitation spectrum, as well as the antiferromagnet-quantum spin liquid transition, are determined. The orthorhombicity parameter, the sublattice magnetization, the violation of the spherical symmetry of spin-spin correlation functions, and the magnetic moment in Gd2CuO4 and Eu2CuO4 are calculated. (C) 2003 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgoivdok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аплеснин, Сергей Степанович
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Aplesnin, S. S.
Spinon excitations in 2D uantum spin liquid with S=1/2 interacted with acoustic phonons / S. S. Aplesnin // EASTMAG-2004 : abstract book / org. com. K. S. Aleksandrov [et al.]. - Krasnoyarsk, 2004. - Sect.: Fundamental magnetic properties. - P. 54. - Cited References: 3

Держатели документа:
Kirensky Institute of Physics

Доп.точки доступа:
Aleksandrov, K. S. \org. com.\; Александров, Кирилл Сергеевич; Аплеснин, Сергей Степанович; Российская академия наук; Научный совет по физике конденсированных сред РАН; Научный совет РАН по физике низких температурСибирское отделение РАН; Красноярский научный центр Сибирского отделения РАН; Институт физики им. Л.В. Киренского Сибирского отделения РАН; Красноярский государственный университет; Красноярский государственный технический университет; Институт физики металлов Уральского отделения РАН; Euro-asian symposium "Trends in magnetism"(2 ; 2004 ; Aug. 24-27 ; Krasnoyarsk); "Trends in magnetism", Euro-Asian Symposium(2 ; 2004 ; Aug. 24-27 ; Krasnoyarsk)
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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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Bifurcations of coupled electron-phonon modes in an antiferromagnet subjected to a magnetic field / K. N. Boldyrev [et al.] // Phys. Rev. Lett. - 2017. - Vol. 118, Is. 16. - Ст. 167203, DOI 10.1103/PhysRevLett.118.167203. - 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. . - ISSN 0031-9007
Кл.слова (ненормированные):
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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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation
Department of Physics, New Jersey Institute of Technology, Newark, NJ, United States
High Field Magnet Laboratory (HFML-EMFL), Radboud University, Nijmegen, Netherlands
Kirenskiy Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Boldyrev, K. N.; Stanislavchuk, T. N.; Sirenko, A. A.; Kamenskyi, D.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, M. N.
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Bikbaev, R. G.
Transparent conductive oxides for the epsilon-near-zero Tamm plasmon polaritons / R. G. Bikbaev, S. Ya Vetrov, I. V. Timofeev // J. Opt. Soc. Am. B. - 2019. - Vol. 36, Is. 10. - P. 2817-2823, DOI 10.1364/JOSAB.36.002817. - Cited References: 44. - The reported study was funded by RFBR according to the research project No 18-32-00053 and financial support RFBR and MOST according to the research project No 19-52-52006. . - ISSN 0740-3224
Кл.слова (ненормированные):
Aluminum oxide -- II-VI semiconductors -- Indium compounds -- Infrared devices -- Optical films -- Phonons -- Photons -- Plasmons -- Q factor measurement -- Tin oxides -- Transfer matrix method -- Transparent conducting oxides -- Zinc oxide
Аннотация: We demonstrate the possibility of using transparent conducting oxides [aluminum-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), indium tin oxide (ITO)] to form Tamm plasmon polaritons in the near-infrared spectral range where the permittivity of oxides is near zero. The spectral properties of the structures are investigated in the framework of the temporal coupled-mode theory and confirmed by the transfer matrix method. It is found that in the critical coupling conditions, the maximal Q-factor of a Tamm plasmon polariton is achieved when a photonic crystal is conjugated with the AZO film, while at the conjugation with the ITO films, the broadest spectral line is obtained. The sensitivity of the wavelength and spectral width of the Tamm plasmon polariton to changes in the oxide film thickness, bulk concentration of a dopant, and angle of incidence is demonstrated.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Бикбаев, Рашид Гельмединович
}
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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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Electron-Phonon Interaction and Phonon Renormalization in the Lamellar Cobaltate NaxCoO2 / A. . Donkov [et al.] // J. Supercond. Nov. Magn. - 2009. - Vol. 22: International Conference on Quantum Phenomena in Complex Matters (JUL 26-AUG 01, 2008, Erice, ITALY), Is. 1. - P. 37-40, DOI 10.1007/s10948-008-0372-6. - Cited References: 16 . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
SUPERCONDUCTIVITY
Кл.слова (ненормированные):
Electron-phonon interaction -- Superconductivity -- Sodium cobaltate -- Electron-phonon interaction -- Sodium cobaltate -- Superconductivity -- Brillouin zones -- Cobaltate -- Conducting electrons -- Conduction electrons -- Doping dependences -- Feedback effects -- Matrix elements -- Phonon frequencies -- Phonon modes -- Raman experiments -- Renormalization -- Sodium cobaltate -- Sodium cobaltates -- Atoms -- Cobalt compounds -- Critical current density (superconductivity) -- Electric conductivity -- Electron-phonon interactions -- Electrons -- Flow interactions -- Penetration depth (superconductivity) -- Sodium -- Superconductivity -- Phonons
Аннотация: We study theoretically the electron-phonon interaction in NaxCoO2. For the A(1g) and E-1g phonon modes found in Raman experiments, we calculate the matrix elements of the electron-phonon interaction. Analyzing the feedback effect of the conduction electrons on the phonon frequency., we investigate the doping dependence of these two phonon modes. Due to the momentum dependence of the electron-phonon interaction, we find the strongest renormalization of the E-1g mode around the Brillouin zone boundary which should be observed in the neutron scattering. At the same time, the A(1g) mode shows the strongest coupling to the conducting electrons around the G point and reveals its doping dependence in the Raman experiments. Our results shed light on the possible importance of the electron-phonon interaction in the lamellar sodium cobaltates.

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Держатели документа:
[Donkov, A.
Eremin, I.
Knolle, J.
Korshunov, M. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Eremin, I.] TU Braunschweig, Inst Math & Theoret Phys, D-38106 Braunschweig, Germany
[Korshunov, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Max-Planck-Institut fur Physik Komplexer Systeme, Dresden 01187, Germany
Institute fur Mathematische und Theoretische Physik, TU Braunschweig, Braunschweig 38106, Germany
Siberian Branch, Russian Academy of Sciences, L.V. Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Donkov, A.; Eremin, I.; Knolle, J.; Korshunov, M. M.; Коршунов, Максим Михайлович
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Engineering localized nonlinear - optical transport with optical phonons / A. K. Popov [и др.] // 13th International Conference on TransparenT Optical Network. - 2011. - Ст. 5971107

eLibrary

Доп.точки доступа:
Popov, A.K.; Slabko, V.V.; Shalaev, M.I.; Myslivets, S. A.; Мысливец, Сергей Александрович; International Conference on Transparent Optical Networks(13 ; 2011 ; June ; 26-30 ; Stockholm, Sweden)
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Excitation of multiple phonon modes in copper metaborate CuB2O4 via nonresonant impulsive stimulated Raman scattering / K. Imasaka [et al.] // Phys. Rev. B. - 2018. - Vol. 98, Is. 5. - Ст. 054303, DOI 10.1103/PhysRevB.98.054303. - 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). . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Physics, Condensed Matter
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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Держатели документа:
Univ Tokyo, Inst Ind Sci, Tokyo 1538505, Japan.
Ioffe Inst, St Petersburg 194021, Russia.
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Kyushu Univ, Dept Phys, Fukuoka, Fukuoka 8190395, Japan.

Доп.точки доступа:
Imasaka, Kotaro; Pisarev, Roman, V; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Shimura, Tsutomu; Kalashnikova, Alexandra M.; Satoh, Takuya; 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]
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10.

Heat capacity study of relaxor PbMg1/3Nb2/3O3 in a wide temperature range / M. V. Gorev [et al.] // J. Exp. Theor. Phys. - 2003. - Vol. 96, Is. 3. - P. 531-537, DOI 10.1134/1.1567427. - Cited References: 21 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
DIFFUSE PHASE-TRANSITION
FERROELECTRICS
Кл.слова (ненормированные):
Differential scanning calorimetry -- Mathematical models -- Phonons -- Random processes -- Specific heat -- Spectrum analysis -- Thermal effects -- Bond-random field models -- Wide temperature intervals -- Lead compounds
Аннотация: Heat capacity of the PbMg1/3Nb2/3O3 compound is measured using the methods of adiabatic and differential scanning calorimetry in the temperature range 80-750 K. Two blurred anomalies on the C-p(T) dependence are observed in wide temperature intervals of 200- 400 K and 500-700 K. The results of studies are discussed together with data on the structure and phonon spectrum in the framework of spherical random bond-random field model. (C) 2003 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
CNRS, CEMES, F-31055 Toulouse, France
ИФ СО РАН
L. V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
CEMES-CNRS, 31055 Toulouse, France

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Sciau, P.
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