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Zobov, V. E.
The coordinate of the singular point of generating functions of clusters in the high-temperature dynamics of spin lattice systems with axially symmetric interaction / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2003. - Vol. 136, Is. 3. - P. 1297-1311, DOI 10.1023/A:1025603416535. - Cited References: 25 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
CONSISTENT FLUCTUATING FIELD
   NUCLEAR-DOUBLE-RESONANCE
   HEISENBERG PARAMAGNET
   LINE SHAPE
   RELAXATION
   SPECTRUM
   APPROXIMATION
   CRYSTALS
   MOMENT
   CAF2
Кл.слова (ненормированные):
spin dynamics -- singular points -- expansion over the reciprocal space dimension -- Expansion over the reciprocal space dimension -- Singular points -- Spin dynamics
Аннотация: We investigate generating functions for equipped trees composed of double bonds of two sorts on a hypercubic lattice of dimension d with built-in fragments. Rules for constructing these clusters are chosen to ensure the estimate for coefficients of power series in time for the longitudinal and transverse autocorrelation functions of the spin system with axially symmetric interaction. We derive a system of two equations for the tree-generating functions and an equation for the generating functions of chains leading from the root to a fragment in a tree using the Bethe approximation and under the condition that mainly bonds of one sort are taken into account. For the face-centered hypercubic lattice, we find the First terms of the 1/d expansion for the coordinate of the singular point of the generating function in both the anisotropic and the isotropic cases taking fragments in the forms of a triangle from four bonds and a four-fold bound pair into account. The obtained result is written in terms of ratios of lattice sums and is generalized to nuclear spin systems with dipole-dipole interaction. The theoretical value of the singular-point coordinate agrees well with the experimental value calculated from the tail of the absorption spectrum of the nuclear magnetic resonance in a barium fluoride monocrystal.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Novosibirsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, RAS, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
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Val'kov, V. V.
Effect of Spin Fluctuations on the Superconducting Phase of Hubbard Fermions in the t-t'-t"-J* Model / V. V. Val'kov, A. A. Golovnya // J. Exp. Theor. Phys. - 2008. - Vol. 107, Is. 6. - P. 996-1008, DOI 10.1134/S1063776108120091. - Cited References: 33. - This work was supported by the Program "Quantum Macrophysics" of the Presidium of the Russian Academy of Sciences, Russian Foundation for Basic Research (project no. 06.02.16100), and Integration project no. 3.4 of the Siberian Branch of the Russian Academy of Sciences. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPECTRUM
Кл.слова (ненормированные):
Electric conductivity -- Fermions -- Integral equations -- Spin dynamics -- Spin fluctuations -- Anomalous components -- Critical temperatures -- Electron concentrations -- Hubbard -- Hubbard operators -- Joint effects -- Large systems -- Nonhomogeneous equations -- One-loop approximations -- Order parameters -- Renormalization -- Scattering process -- Self energies -- Spin-fluctuation -- Strongly correlated electrons -- Superconducting phase -- System of integral equations -- Superconductivity
Аннотация: The effect of spin-fluctuation scattering processes on the region of the superconducting phase in strongly correlated electrons (Hubbard fermions) is investigated by the diagram technique for Hubbard operators. Modified Gor'kov equations in the form of an infinitely large system of integral equations are derived taking into account contributions of anomalous components P(0 sigma),((sigma) over bar0) of strength operator P. It is shown that spin-fluctuation scattering processes in the one-loop approximation for the t-t'-t"-J* model taking into account long-range hoppings and three-center interactions are reflected by normal (P(0 sigma), (0 sigma)) and anomalous (P(0 sigma), ((sigma) over bar0)) components of the strength operator. Three-center interactions result in different renormalizations of the kernels of the integral equations for the superconducting d phase in the expressions for the self-energy and strength operators. In this approximation for the d-type symmetry of the order parameter for the superconducting phase, the system of integral equations is reduced to a system of nonhomogeneous equations for amplitudes. The resultant dependences of critical temperature on the electron concentrations show that joint effect of long-range hoppings, three-center interactions, and spin-fluctuation processes leads to strong renormalization of the superconducting phase region.

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Держатели документа:
[Val'kov, V. V.
Golovnya, A. A.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Val'kov, V. V.
Golovnya, A. A.] Siberian State Aerosp Univ, Krasnoyarsk 660074, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Siberian State Aerospace University, Krasnoyarsk 660074, Russian Federation

Доп.точки доступа:
Golovnya, A. A.; Головня, Александр Александрович; Вальков, Валерий Владимирович
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The Kohn-Luttinger effect and anomalous pairing in new superconducting systems and graphene / M. Y. Kagan [et al.] // J. Exp. Theor. Phys. - 2014. - Vol. 118, Is. 6. - P. 995-1011, DOI 10.1134/S1063776114060132. - Cited References: 114. - This study was supported by the Program of the Physics Department of the Russian Academy of Sciences (project no. P.3.1) and the Russian Foundation for Basic Research (project nos. 14-02-00058 and 14-02-31237). The work of two coauthors (M. M. K. and V.A.M) was supported financially by grant no. MK-526.2013.2 of the President of the Russian Federation and the Dynasty Foundation. . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
P-WAVE SUPERCONDUCTIVITY
   EXTENDED HUBBARD-MODEL
   NARROW ENERGY-BANDS
   2D KONDO-LATTICE
   FERMI GAS
   REPULSIVE INTERACTIONS
   ELECTRON CORRELATIONS
   COOPER INSTABILITY
   PHASE-DIAGRAM
   SPECTRUM
Аннотация: We present a review of theoretical investigations into the Kohn-Luttinger nonphonon superconductivity mechanism in various 3D and 2D repulsive electron systems described by the Fermi-gas, Hubbard, and Shubin-Vonsovsky models. Phase diagrams of the superconducting state are considered, including regions of anomalous s-, p-, and d-wave pairing. The possibility of a strong increase in the superconducting transition temperature T c even for a low electron density is demonstrated by analyzing the spin-polarized case or the two-band situation. The Kohn-Luttinger theory explains or predicts superconductivity in various materials such as heterostructures and semimetals, superlattices and dichalcogenides, high-T c superconductors and heavy-fermion systems, layered organic superconductors, and ultracold Fermi gases in magnetic traps. This theory also describes the anomalous electron transport and peculiar polaron effects in the normal state of these systems. The theory can be useful for explaining the origin of superconductivity and orbital currents (chiral anomaly) in systems with the Dirac spectrum of electrons, including superfluid 3He-A, doped graphene, and topological superconductors.

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Публикация на русском языке Эффект Кона-Латтинжера и аномальное спаривание в новых сверхпроводящих системах и графене [Текст] / М. Ю. Каган [и др.] // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 118 Вып. 6. - С. 1127-1146

Держатели документа:
Russian Acad Sci, Kapitza Inst Phys Problems, Moscow 119334, Russia
Natl Res Univ, Higher Sch Econ, Moscow State Inst Elect & Math, Moscow 109028, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Kagan, M. Y.; Val'kov, V. V.; Вальков, Валерий Владимирович; Mitskan, V. A.; Мицкан, Виталий Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Physics Department of the Russian Academy of Sciences [P.3.1]; Russian Foundation for Basic Research [14-02-00058, 14-02-31237]; Russian Federation [MK-526.2013.2]; Dynasty Foundation
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The comparative-analysis of some low-frequency vibrational-state density models of the amorphous materials - applied to the as2s3 glass / A. Feher [et al.] // Physica B. - 1994. - Vol. 194. - P. 395-396, DOI 10.1016/0921-4526(94)90527-4. - Cited References: 6 . - ISSN 0921-4526

РУБ Physics, Condensed Matter
Рубрики:
SPECTRUM
Аннотация: The specific heat from 3K to 15K and the Raman spectra were measured on the As2S3 glass. The specific heat data were fitted using two different models of the vibrational state density, i.e. the phonon-fraction model and the model of lognormal distribution of frequencies. We have shown that the excess vibrational state density which governs the specific heat behaviour gives only a little contribution to the intensity of Raman scattering in the boson peak region.

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Держатели документа:
UNIV UZHGOROD,DEPT PHYS SEMICOND,UZHGOROD 294000,UKRAINE
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН

Доп.точки доступа:
Feher, A.; Yyurkin, I. M.; Deich, L. I.; Orendac, M.; Turyanitsa, I. D.; International Conference on Low Temperature Physics(20 ; 1993 ; Aug. 04-11 ; Eugene, OR)
}
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Spin-Wave Resonance in One-Dimensional Magnonic Crystals by an Example of Multilayer Co-P Films / R. S. Iskhakov, S. V. Stolyar, L. A. Chekanova, I. G. Vazhenina // Phys. Solid State. - 2020. - Vol. 62, Is. 10. - P. 1861-1867, DOI 10.1134/S1063783420100121. - Cited References: 47 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
FERROMAGNETIC-RESONANCE
   SPECTRUM
   MODES
   INHOMOGENEITIES
Кл.слова (ненормированные):
spin-wave resonance -- surface-anisotropy constant -- exchange-interaction constant -- amorphous and nanocrystalline alloys
Аннотация: Layered magnetic films of Co–P alloy, which are sets of laminates with certain atomic and chemical structures, have been investigated by spin-wave resonance. Coatings of two types were synthesized: a magnonic crystal (amorphous Co(P)/fcc Co(P))N and gradient Co(P) films. They exhibit two different modifications of the spin-wave resonance (SWR) spectrum. In the first case, the SWR spectrum is described as Hn(n) ~ n2 with a modification caused by the formation of the first stop band of the magnonic crystal. In the second case, the dependence of resonance fields Hn of the spin-wave modes on mode number n has the form of Hn(n) ~ n2/3. Thermal annealing leads to crystallization (amorphous alloy → fcc) and causes transformation of the layered films to the films of single-phase Co–P alloys, which is accompanied by a change in the shapes of the SWR spectra and occurrence of a “exchange kink” spectral modification.

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Публикация на русском языке Спин-волновой резонанс в одномерных магнонных кристаллах, на примере мультислойных пленок Co-P [Текст] / Р. С. Исхаков, С. В. Столяр, Л. А. Чеканова, И. Г. Важенина // Физ. тверд. тела. - 2020. - Т. 62 Вып. 10. - С. 1658-1664

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Fed Res Ctr, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Stolyar, S. V.; Chekanova, L. A.; Чеканова, Лидия Александровна; Vazhenina, I. G.; Важенина, Ирина Георгиевна
}
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Spin-Wave Resonance in Multilayer Films (One-Dimensional Magnon Crystals). Identification Rules / R. S. Iskhakov [et al.] // JETP Letters. - 2011. - Vol. 94, Is. 4. - P. 301-305, DOI 10.1134/S0021364011160077. - Cited References: 17. - This work was supported by the Ministry of Education and Science of the Russian Federation, project no. RNP 2.1.1/3498, program "Development of Scientific Potential of Higher Schools" for 2009 and 2010 and the program "Scientific and Pedagogical Personnel of Innovative Russia" for 2009-2013. We are grateful to Prof. V. A. Ignatchenko for stimulating discussions. . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
SPECTRUM
ALLOYS
Аннотация: The characteristic modification of the spectrum of the exchange spin waves has been revealed in ferromagnet/ferromagnet multilayer films with a thickness of N(d(1) + d(2)) by the spin-wave resonance method. This modification is due to the first bandgap at the wavenumber k(b) = pi/(d(1) + d(2)) of a magnon crystal, which is formed by one-dimensional modulation of the magnetization. It has been shown that the transformation of the multilayer film with thermal annealing to the film of a single-phase alloy is accompanied by the disappearance of this modification of the spectrum. DOI: 10.1134/S0021364011160077

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Держатели документа:
[Iskhakov, R. S.
Stolyar, S. V.
Chekanova, L. A.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Stolyar, S. V.
Chizhik, M. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Stolyar, S. V.; Столяр, Сергей Викторович; Chizhik, M. V.; Чижик, Михаил Владимирович; Chekanova, L. A.; Чеканова, Лидия Александровна
}
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Spin Wave Resonance in the [(Co0.88Fe0.12)/Cu]N Synthetic Antiferromagnet / I. G. Vazhenina, R. S. Iskhakov, M. A. Milyaev [et al.] // Tech. Phys. Lett. - 2020. - Vol. 46, Is. 11. - P. 1076-1079, DOI 10.1134/S1063785020110140. - Cited References: 19. - This study was carried out under a state order of the Ministry of Science and Higher Education of the Russian Federation (theme "Spin" no. AAAA-A18-118020290104-2) and supported in part by the Russian Foundation for Basic Research (project no. 20-42-660018) . - ISSN 1063-7850. - ISSN 1090-6533

РУБ Physics, Applied
Рубрики:
MAGNETIC-PROPERTIES
   MAGNETORESISTANCE
   SPECTRUM
   FILMS
Кл.слова (ненормированные):
spin wave resonance -- synthetic antiferromagnet -- exchange coupling constant
Аннотация: The [(Co0.88Fe0.12)/Cu]N synthetic antiferromagnet has been investigated by the spin wave resonance method over the entire range of angles of an external dc magnetic field to the film surface normal. The investigations have shown that the superlattice under study consists of two exchange-coupled magnetic subsystems, each manifested in the recorded spectra as a series of spin-wave modes. The dependence of the linear region of propagation of a standing spin-wave mode on the sample orientation in an external magnetic field has been established.

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Публикация на русском языке Спин-волновой резонанс в синтетическом антиферромагнетике [(Co0.88Fe0.12)/Cu]N [Текст] / И. Г. Важенина, Р. С. Исхаков, М. А. Миляев [и др.] // Письма в Журн. техн. физ. - 2020. - T. 46 Вып. 21. - С. 28-31

Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Ural Branch, MN Mikheev Inst Met Phys, Ekaterinburg 620108, Russia.

Доп.точки доступа:
Vazhenina, I. G.; Важенина, Ирина Георгиевна; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Milyaev, M. A.; Naumova, L. I.; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Ministry of Science and Higher Education of the Russian Federation [AAAA-A18-118020290104-2]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [20-42-660018]
}
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Shneyder, E. I.
Phonon and magnetic pairing mechanisms in high-temperature superconductors in the strong correlation limit / E. I. Shneyder, S. G. Ovchinnikov // JETP Letters. - 2006. - Vol. 83, Is. 9. - P. 394-398, DOI 10.1134/S0021364006090062. - Cited References: 22 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
BAND HUBBARD-MODEL
   ELECTRON
   SCATTERING
   SPECTRUM
Аннотация: The t-t'-t"-J* model of electrons interacting with three phonon modes (breathing, apical breathing, and buckling) is considered. The wave-vector dependence of the matrix elements of the electron-phonon interaction leads to opposite contributions to the pairing potential with the d(x2-y2) symmetry: the buckling mode facilitates electron pairing, while the breathing mode suppresses it. As a result, the critical temperature of La2-xSrxCuO4 that is associated with the magnetic mechanism is lowered when phonons are taken into account.

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Шнейдер, Елена Игоревна
}
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Phase transition in the layered perovskite CsScF4 induced by hydrostatic pressure / K. S. Aleksandrov [et al.] // Phys. Solid State. - 1999. - Vol. 41, Is. 9. - P. 1541-1543, DOI 10.1134/1.1131019. - Cited References: 9 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SPECTRUM
Аннотация: Using polarization microscopy and Raman scattering, we have discovered a new phase transition in the layered perovskite crystal CsScF4 under a hydrostatic pressure around 6 GPa. The proposed space group of the high-pressure phase is C-2h(2), Z=4. (C) 1999 American Institute of Physics. [S1063-7834(99)03109-3].

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Публикация на русском языке Фазовый переход в слоистом перовските CsScF[4], индуцированный гидростатическим давлением [Текст] / К. С. Александров [и др.] // Физ. тверд. тела. - Санкт-Петербург, 1999. - Т. 41 Вып. 9. - С. 1683-1685

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Unified Inst Geol Geophys & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Shmygol', I. V.; Шмыголь И. В.; Goryainov, S. V.; Горяйнов, Сергей Владимирович
}
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10.

Ovchinnikov, S. G.
Role of zinc and nickel impurities in high-temperature superconductors / S. G. Ovchinnikov // Phys. Solid State. - 1999. - Vol. 41, Is. 4. - P. 534-538, DOI 10.1134/1.1130819. - Cited References: 32 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PR2-XCEXCUO4+DELTA SINGLE-CRYSTALS
   SR-CU-O
   COPPER OXIDES
   MAGNETIC-PROPERTIES
   NI
   MODEL
   ZN
   SUBSTITUTION
   SCATTERING
   SPECTRUM
Аннотация: The local changes produced in the electronic structure and their effect on the physical properties of the superconducting and normal phases when zinc and nickel are substituted for copper are examined on the basis of a multiband p-d model. It is shown that strong electronic correlations suppress the S = 1 configuration of Ni2+ and cause the superposition of the S = 1/2 and S = 0 states of nickel. The change in the density of states in p- and n-type systems is studied, and the peculiarity of Zn impurity for p- type systems and Ni impurity for n-type systems is shown. The universal dependence of the T-c on the residual resistance in lightly doped superconductors and deviations from it in optimally doped systems are discussed. (C) 1999 American Institute of Physics. [S1063-7834(99)00704-2].

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Роль примесей цинка и никеля в высокотемпературных сверхпроводниках [Текст] / С. Г. Овчинников // Физ. тверд. тела. - 1999. - Т. 41 Вып. 4. - С. 596-600

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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11.

Ovchinnikov, S. G.
Lifshits Quantum Phase Transitions and Rearrangement of the Fermi Surface upon a Change in the Hole Concentration in High-Temperature Superconductors / S. G. Ovchinnikov, M. M. Korshunov, E. I. Shneyder // J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 5. - Pю. 775-785, DOI 10.1134/S1063776109110077. - Cited References: 71. - The authors thank A. A. Kordyuk for discussion of the results and T. M. Ovchinnikova for technical assistance in data processing.This study was supported by the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences (project no. 5.7), integrated project no. 40 of the Siberian Branch-Ural Division of the Russian academy of Sciences, and the Russian Foundation for Basic Research (project no. 09-02-00127). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   CORRELATED ELECTRONS
   COPPER OXIDES
   SPECTRUM
   PSEUDOGAP
   METAL
   FLUCTUATIONS
   EXCITATIONS
   INSULATOR
   SYSTEMS
Кл.слова (ненормированные):
Critical points -- Cuprates -- Electron heat -- Electron structures -- Experimental data -- High-T -- Layered cuprates -- Low temperatures -- Normal phase -- Quantum oscillations -- Quantum phase transitions -- Sign reversal -- Strong correlation -- Copper compounds -- Electronic structure -- Equations of state -- Fermi surface -- Fermions -- High temperature superconductors -- Hole concentration -- Superconductivity -- Surface structure -- Phase transitions
Аннотация: Changes in the electronic structure in the normal phase of high-T-c superconductors (HTSCs), viz., layered cuprates, are considered. The results of LDA + GTB calculations of the electron structure and the Fermi surface of La2-xSrxCuO4 one-layer cuprates with allowance for strong correlations are compared with ARPES and quantum oscillations data. Two critical points x(c1) and x(c2) are discovered at which the rearrangement of the Fermi surface takes place. In the vicinity of these points, changes in the thermodynamic properties at low temperatures are determined using the Lifshits ideology concerning 2.5-order quantum phase transitions. A singularity delta(C/T) proportional to (x-x(e))(1/2) in the electron heat capacity agrees well with the available experimental data in the vicinity of x(c1)approximate to 0.15. Sign reversal of the Hall constant upon doping is also considered qualitatively.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Квантовые фазовые переходы Лифшица и перестройка ферми-поверхности с изменением концентрации дырок в высокотемпературных сверхпроводниках [Текст] / С. Г. Овчинников, М. М. Коршунов, Е. И. Шнейдер // Журнал экспериментальной и теоретической физики. - 2009. - Т. 136 Вып. 5. - С. 898-909

Держатели документа:
[Ovchinnikov, S. G.
Korshunov, M. M.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Korshunov, M. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Korshunov, M. M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
[Shneyder, E. I.] Reshetnikov Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
Department of Physics, University of Florida, Gainesville, FL 32611, United States
Reshetnikov Siberian State Aerospace University, Krasnoyarsk, 660014, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич; Presidium of the Russian Academy of Sciences [5.7]; Russian academy of Sciences; Russian Foundation for Basic Research [09-02-00127]
}
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12.

Ovchinnikov, S. G.
Effect of interlayer tunneling on the electronic structure of bilayer cuprates and quantum phase transitions in carrier concentration and high magnetic field / S. G. Ovchinnikov, I. A. Makarov, E. I. Shneyder // J. Exp. Theor. Phys. - 2011. - Vol. 112, Is. 2. - P. 288-302, DOI 10.1134/S106377611005119X. - Cited References: 64. - This study was supported financially by the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences (project no. 5.7), the integration projects of the Siberian Branch and the Ural Division of the Russian Academy of Sciences (project no. 40), the Russian Foundation for Basic Research (project no. 09-02-00127), the President of the Russian Federation (grant no. MK-1683.2010.2), and the Federal Target Program P891. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   HIGH-TEMPERATURE SUPERCONDUCTORS
   DIMENSIONAL HUBBARD-MODEL
   FERMI-SURFACE
   COPPER OXIDES
   GROUND-STATE
   CUO2 PLANES
   SPECTRUM
   BAND
   NMR
Кл.слова (ненормированные):
Antibonding -- Bi-layer -- Bilayer cuprates -- Complex sequences -- Cuprates -- Doping levels -- External magnetic field -- Field magnitude -- Hartree-Fock approximations -- High magnetic fields -- Lifshitz transition -- Main effect -- Orbitals -- Perturbation theory -- Quantum phase transitions -- Quantum transitions -- Single-layer structure -- Theoretical study -- Unit cells -- Carrier concentration -- Copper compounds -- Density functional theory -- Electronic properties -- Electronic structure -- Hartree approximation -- Magnetic fields -- Perturbation techniques -- Phase transitions -- Surface structure -- Quantum theory
Аннотация: We present a theoretical study of the electronic structure of bilayer HTSC cuprates and its evolution under doping and in a high magnetic field. Analysis is based on the t-t'-taEuro(3)-J* model in the generalized Hartree-Fock approximation. Possibility of tunneling between CuO2 layers is taken into account in the form of a nonzero integral of hopping between the orbitals of adjacent planes and is included in the scheme of the cluster form of perturbation theory. The main effect of the coupling between two CuO2 layers in a unit cell is the bilayer splitting manifested in the presence of antibonding and bonding bands formed by a combination of identical bands of the layers themselves. A change in the doping level induces reconstruction of the band structure and the Fermi surface, which gives rise to a number of quantum phase transitions. A high external magnetic field leads to a fundamentally different form of electronic structure. Quantum phase transitions in the field are observed not only under doping, but also upon a variation of the field magnitude. Because of tunneling between the layers, quantum transitions are also split; as a result, a more complex sequence of the Lifshitz transitions than in single-layer structures is observed.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Влияние межслойного туннелирования на электронную структуру двухслойных купратов и квантовые фазовые переходы по концентрации носителей и сильному магнитному полю [Текст] / С. Г. Овчинников, И. А. Макаров, Е. И. Шнейдер // Журнал экспериментальной и теоретической физики. - 2011. - Т. 139 Вып. 2. - С. 334-350

Держатели документа:
[Ovchinnikov, S. G.
Makarov, I. A.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.
Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Makarov, I. A.; Макаров, Илья Анатольевич; Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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13.

Ovchinnikov, S. G.
EFFECT OF ANTIFERROMAGNETIC ORDERING ON ZONE STRUCTURE OF LA2CUO4 / C. G. OVCHINNIKOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1995. - Vol. 107, Is. 3. - P. 796-811. - Cited References: 42 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-TC SUPERCONDUCTORS
   ELECTRONIC-STRUCTURE
   OXIDE SUPERCONDUCTORS
   CHARGE-TRANSFER
   CUO2 PLANE
   MODEL
   HOLE
   SPECTRUM
   STATE

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Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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14.

Ovchinnikov, S. G.
Anomalous thermodynamics of the doped Mott-Hubbard insulators / S. G. Ovchinnikov, K. A. Sidorov, E. I. Shneyder // Phys. Solid State. - 2011. - Vol. 53, Is. 2. - P. 299-302, DOI 10.1134/S1063783411020247. - Cited References: 6. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00127), the Branch of the Physical Sciences of the Russian Academy of Sciences (program nos. 2 and 3), grant no. MK-1683.2010.2, and by the Federal Target Program "Personnel" (project NK-589 P). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
T-J MODEL
SPECTRUM
Аннотация: The concentration dependence of the entropy of doped Mott-Hubbard insulators has been considered within the t-J model. It has been shown that a change in the type and statistics of charge carriers as compared to the Fermi gas leads to a radical change in the entropy s, in particular, to the giant growth of the entropy upon doping. The quantity a,s/a,x a parts per thousand k (B) is approximately consistent with the experimental data for HTSC cuprates in the pseudogap phase.

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Публикация на русском языке Овчинников, Сергей Геннадьевич. Аномальная термодинамика допированных диэлектриков Мотта-Хаббарда [Текст] / С. Г. Овчинников, К. А. Сидоров, Е. И. Шнейдер // Физ. тверд. тела. - 2011. - Т. 53 Вып. 2. - С. 280-283

Держатели документа:
[Ovchinnikov, S. G.
Sidorov, K. A.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.
Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660014, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Sidorov, K. A.; Shneyder, E. I.; Шнейдер, Елена Игоревна; Овчинников, Сергей Геннадьевич
}
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15.

Microscopic model of the coexistence of superconductivity and ferromagnetism in the hybrid ruthenate-cuprate oxide RuSr2GdCu2O8 / E. V. Kuz'min [et al.] // J. Exp. Theor. Phys. - 2000. - Vol. 91, Is. 2. - P. 353-360, DOI 10.1134/1.1311995. - Cited References: 37 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   HUBBARD-MODEL
   LAYERED PEROVSKITE
   SR2RUO4
   ELECTRONS
   COPPER
   SPECTRUM
Аннотация: A microscopic t-J-I model with competing antiferromagnetic (J) and ferromagnetic (I) exchange interactions is proposed for strongly correlated electrons in RuSr2GdCu2O8 . It is assumed that J much greater than I for CuO2 layers and J much less than I for RuO2 layers. A superconducting solution of d(x2-y2) symmetry was obtained for the CuO2 layers while competition between ferromagnetism and p-type triplet superconducting pairing is obtained for RuO2 layers. It is shown that the RuO2 layers have a lower carrier concentration in the Hubbard subband formed by coupled ((d(xy)-p)-pi) orbitals compared with a bulk Sr2RuO4 crystal, which leads to stabilization of the ferromagnetic state in the RuO2 layer. (C) 2000 MAIK "Nauka/Interperiodica".

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Публикация на русском языке Микроскопическая модель сосуществования сверхпроводимости и ферромагнетизма в гибридном рутенатно-купратном оксиде RuSr2GdCu2O8 [Текст] / Е. В. Кузьмин [и др.] // Журн. эксперим. и теор. физ. - 2000. - Т. 118 Вып. 2.- С.404

Держатели документа:
Krasnoyarsk State Univ, Krasnoyarsk 660062, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Kuz'min, E. V.; Кузьмин, Евгений Всеволодович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Baklanov, I. O.; Бакланов И. О.; Goryachev, E. G.; Горячев, Евгений Геннадьевич
}
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16.

Mankov, Y. I.
High-frequency susceptibility of a multilayered ferromagnetic system with two-dimensional inhomogeneities / Y. I. Mankov, D. S. Tsikalov // Phys. Solid State. - 2010. - Vol. 52, Is. 3. - P. 544-553, DOI 10.1134/S1063783410030157. - Cited References: 24. - This study was supported in part by the Council on Grants from the President of the Russian Federation for the State Support of Scientific Investigations performed by the Leading Scientific Schools (grant no. 3818.2008.3), the Presidium of the Russian Academy of Sciences (Program no. 27.1), and the Ministry of Education and Science within the framework of the Federal Program (State Contract no. 2.740.11.0220). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SPIN-WAVE SUSCEPTIBILITY
   SPECTRUM
   SUPERLATTICES
   INTERFACES
Аннотация: This paper reports on the results of the investigation of the high-frequency susceptibility of a layered ferromagnetic structure in which, apart from a periodic change in the magnetic anisotropy parameter from layer to layer, this parameter varies along layers according to a random law (the superlattice with two-dimensional phase inhomogeneities). The evolution of the frequency dependence of the imaginary part of the averaged Green's function in the range of the energy gap (band gap) in the spectrum of waves propagating along the superlattice axis due to the change in the relative root-mean-square fluctuations of the phase gamma 2 has been studied at the boundaries of the odd Brillouin zones. It has been found that, for all odd Brillouin zones, the imaginary part of the Green's function exhibits a universal behavior: the peak corresponding to the edge of the band gap with a lower frequency remains unchanged, and the peak corresponding to the edge of the band gap with a higher frequency is smoothed with an increase in the quantity gamma(2). These effects, which were initially revealed at the boundary of the first Brillouin zone of the sinusoidal superlattice, have been explained, as before, by the specific features of the energy conservation laws for the incident and scattered waves in the lattice with two-dimensional inhomogeneities. It has been demonstrated that an increase in the Brillouin zone number leads to a decrease in the value of gamma(2) at which the peak at the edge of the band gap with a higher frequency disappears.

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Держатели документа:
[Mankov, Yu. I.
Tsikalov, D. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Mankov, Yu. I.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodny 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Tsikalov, D. S.; Цикалов, Денис Сергеевич
}
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17.

Makarov, I. A.
Temperature dependence of the electronic structure of La2CuO4 in the multielectron LDA+GTB approach / I. A. Makarov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2015. - Vol. 121, Is. 3. - P. 457-464, DOI 10.1134/S1063776115090174. - Cited References: 38. - The work was supported by the Russian Science Foundation (project no. 14-12-00061) . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
Copper oxides
   Model
   Superconductivity
   Excitations
   Instability
   Spectrum
   States
   Order
Аннотация: The band structure of La2CuO4 in antiferromagnetic and paramagnetic phases is calculated at finite temperatures by the multielectron LDA+GTB method. The temperature dependence of the band spectrum and the spectral weight of Hubbard fermions is caused by a change in the occupation numbers of local multielectron spin-split terms in the antiferromagnetic phase. A decrease in the magnetization of the sublattice with temperature gives rise to new bands near the bottom of the conduction band and the top of the valence band. It is shown that the band gap decreases with increasing temperature, but La2CuO4 remains an insulator in the paramagnetic phase as well. These results are consistent with measurements of the red shift of the absorption edge in La2CuO4 with increasing temperature. © 2015, Pleiades Publishing, Inc.

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Публикация на русском языке Макаров, Илья Анатольевич. Температурная зависимость электронной структуры La2CuO4 в многоэлектронном подходе LDA+GTB [Текст] / И. А. Макаров, С. Г. Овчинников // Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 148 Вып. 3. - С. 526-534

Держатели документа:
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
}
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18.

Makarov, I. A.
Reconstruction of the Fermi surface of HTSC cuprates in a high magnetic field / I. A. Makarov, S. G. Ovchinnikov, E. I. Shneider // JETP Letters. - 2009. - Vol. 89, Is. 12. - P. 632-637, DOI 10.1134/S002136400912008X. - Cited References: 19. - This work was supported by the Russian Foundation for Basic Research (project no. 09-02-00127), the Siberian Branch and the Ural Division, Russian Academy of Sciences (integration project no. 40), and the Presidium of the Russian Academy of Sciences (program no. 5.7). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   COPPER OXIDES
   ELECTRON
   SPECTRUM
   BAND
Аннотация: The effect of a high magnetic field on the electronic structure of HTSC cuprates is considered. The study is performed in the t-t'-taEuro(3)-J* model, and the high magnetic field effect is taken into account not only as the Zeeman splitting of the one-electron levels, but also in the occupation numbers of the states with different spin projections and in the formation of the spin correlation functions. The field is assumed to be high enough to align all of the spins along the field. As a result, the Fermi surface reconstruction is obtained from four hole pockets about the nodal point (pi/2, pi/2) in the paramagnetic phase to a large hole pocket about the point (pi, pi) in the ferromagnetic phase. As the magnetic field strength decreases, a number of quantum phase transitions are revealed; they are manifested in the changed Fermi surface topology. The Fermi surface reconstruction with a decreasing field is qualitatively the same as that with an increasing doping degree in the absence of a magnetic field.

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Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.
Shneider, E. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneider, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Shneider, E. I.; Шнейдер, Елена Игоревна; Макаров, Илья Анатольевич; Russian Foundation for Basic Research [09-02-00127]; Siberian Branch and the Ural Division, Russian Academy of Sciences [40]; Presidium of the Russian Academy of Sciences [5.7]
}
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19.

Makarov, I. A.
Effect of Interlayer Single-Particle Hoppings on the Superconducting Transition Temperature / I. A. Makarov, S. G. Ovchinnikov // JETP Letters. - 2011. - Vol. 93, Is. 6. - P. 339-343, DOI 10.1134/S0021364011060063. - Cited References: 27. - This work was supported by the Presidium of the Russian Academy of Sciences (program no. 18.7 "Quantum Physics of Condensed Matter"), by the Siberian and Ural Branches of the Russian Academy of Sciences (joint project no. 40), by the Russian Foundation for Basic Research (project no. 09-02-00127), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-1683.2010.2), and by the Ministry of Education and Science of the Russian Federation (project no. GK P891, federal program "Scientific and Pedagogical Personnel of Innovative Russia"). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
T-J MODEL
   DEPENDENCE
   YBA2CU3O7-DELTA
   ELECTRON
   SPECTRUM
   STRESS
Аннотация: It is well known that the superconducting transition temperature of high-T-c cuprates depends on the number of CuO2 planes in the unit cell. The multilayer structure implies the possibility of interlayer hopping. Under the assumption that the interlayer hopping can be specified by the parameter t(perpendicular to)(k) = t(perpendicular to)(cos(k(x)) - cos(k(y)))(2), the quasiparticle excitation spectrum for the bilayer cuprate in the superconducting state has been determined in the framework of the t - t' - t '' - t(perpendicular to) - J* model using the generalized mean-field approximation. It turns out that the interlayer hoppings does not create any additional mechanism of the Cooper paring and does not lead to an increase in T-c. The splitting of the upper Hubbard quasiparticle band attributed to the interlayer hoppings is manifested as two peaks in the doping dependence of the superconducting transition temperature at temperatures below the maximum T-c value for a single-layer cuprate. It has been found that antiferromagnetic interlayer correlations suppress the interlayer splitting. This probably leads to the common doping dependence of T-c for both single-layer and bilayer cuprates.

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Держатели документа:
[Makarov, I. A.
Ovchinnikov, S. G.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Макаров, Илья Анатольевич
}
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20.

    Magnetic-field tunable defect modes in a photonic-crystal/liquid-crystal cell / V. Ya. Zyryanov [et al.] // Opt. Express. - 2010. - Vol. 18, Is. 2. - P. 1283-1288, DOI 10.1364/OE.18.001283. - Cited Reference Count: 15. - Гранты: This work was partially supported by the Russian Federal Grant No. 02.740.11.0220 and SB RAS Grant Nos. 5, 27.1 and 144. W. Lee gratefully acknowledges financial support from the National Science Council of the Republic of China (Taiwan) under Grant No. NSC 98-2923-M-033-001-MY3 dedicated to an internationally joint effort between Russia and Taiwan. - Финансирующая организация: Russian Federal [02.740.11.0220]; SB RAS [5, 27.1, 144]; National Science Council of the Republic of China (Taiwan) [NSC 98-2923-M-033-001-MY3] . - JAN 18. - ISSN 1094-4087
Рубрики:
NEMATIC LIQUID-CRYSTAL
   BAND-GAP MATERIALS
   SPONTANEOUS EMISSION
   SPECTRUM
Кл.слова (ненормированные):
Crystal defects -- Magnetic fields -- Photonic crystals -- Applied magnetic fields -- Crossed polarizers -- Crystal cells -- Defect mode -- Homeotropic -- Light transmission spectra -- Light wave -- Nematic director -- Optical cells -- Planar alignment -- Spectral shift -- Tunable defect -- Light transmission -- article -- artifact -- chemistry -- electromagnetic field -- liquid crystal -- materials -- materials testing -- radiation exposure -- refractometry -- Artifacts -- Electromagnetic Fields -- Liquid Crystals -- Manufactured Materials -- Materials Testing -- Refractometry
Аннотация: Light transmission spectrum of a multilayer photonic crystal with a central liquid-crystal defect layer placed between crossed polarizers has been studied. Transmittance was varied due to the magnetically induced reorientation of the nematic director from homeotropic to planar alignment. Two notable effects were observed for this scheme: the spectral shift of defect modes corresponding to the extraordinary light wave and its superposition with the ordinary one. As a result, the optical cell allows controlling the intensity of interfering defect modes by applied magnetic field. (C) 2010 Optical Society of America

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660014, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Chung Yuan Christian Univ, Dept Phys, Chungli 32023, Taiwan
Chung Yuan Christian Univ, Ctr Nanotechnol, Chungli 32023, Taiwan

Доп.точки доступа:
Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Parshin, A. M.; Паршин, Александр Михайлович; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Shabanov, V. F.; Шабанов, Василий Филиппович; Lee, Wei
}
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