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Zobov, V. E.
On the short duration limit for the correlation-functions of 2 distant spins at high-temperatures / V. E. Zobov // Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. - Vol. 99, Is. 3. - P. 809-815. - Cited References: 15 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
Рубрики:
DYNAMICS
Аннотация: The first term in the expansion in powers of time is found for the correlation function of two spins separated by a large distance in the case of an anisotropic Heisenberg paramagnet.

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Доп.точки доступа:
Зобов, Владимир Евгеньевич
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ZOBOV, V. E.
ON THE DEPENDENCE OF THE SPECTRAL WINGS OF THE HEISENBERG PARAMAGNET AUTO-CORRELATION FUNCTION ON HAMILTONIAN ANISOTROPY / V. E. ZOBOV, O. V. FALALEEV // Fiz. Tverd. Tela. - 1989. - Vol. 31, Is. 1. - P. 30-32. - Cited References: 9 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Доп.точки доступа:
FALALEEV, O. V.
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MARTYNOV, S. N.
CORRELATION-FUNCTIONS AND ELECTRON-SPIN-RESONANCE LINEWIDTH OF TWO-DIMENSIONAL HEISENBERG MAGNETS / S. N. MARTYNOV // Fiz. Tverd. Tela. - 1986. - Vol. 28, Is. 10. - P. 3006-3011. - Cited References: 15 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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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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Ignatchenko, V. A.
Correlation-induced coupling of wave fields in disordered media / V. A. Ignatchenko, M. V. Erementchouk, A. A. Maradudin // Phys. Rev. B. - 2001. - Vol. 63, Is. 5. - Ст. 54205. - Cited References: 8 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
HARMONIC OSCILLATOR
CROSSING RESONANCE
Аннотация: The interaction of two wave fields of different physical natures in a disordered medium with a zero-mean coupling between these fields is studied for the example of spin and elastic waves in zero-mean magnetostrictive media. It is shown that correlations between inhomogeneities of the coupling parameter and any other parameter of the medium lead to the appearance of an effective coupling parameter between the averaged waves, which is proportional to the intensity of the correlation and, correspondingly, to the possibility of the excitation of the averaged wave of one field by a force acting on the other wave field.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Calif Irvine, Irvine, CA 92717 USA
ИФ СО РАН

Доп.точки доступа:
Erementchouk, M. V.; Maradudin, A. A.; Игнатченко, Вальтер Алексеевич
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Avramov, P. V.
The strong electron correlation effects in XAFS spectra of HTSC cuprates / P. V. Avramov, S. G. Ovchinnikov // J. Phys. IV. - 1997. - Vol. 7: 9th International Conference on X-Ray Absorption Fine Structure (AUG 26-30, 1996, GRENOBLE, FRANCE), Is. C2. - P. 183-185. - Cited References: 11 . - ISSN 1155-4339

РУБ Physics, Multidisciplinary
Рубрики:
X-RAY-ABSORPTION
   MULTIPLE-SCATTERING ANALYSIS
   EDGE STRUCTURE
   LA2CUO4
   XANES
Аннотация: Theoretical XAFS spectra of highly correlated copper oxides have been presented as a product of a single-electron part obtained by the SCF X alpha- SW method, and a multi-electron part obtained by the multi-band multi-electron p-d model. The main line of CuK-spectrum of La2CuO4 was aligned to the Cud(10) (L) under bar configuration and the single satellite line was aligned to the Cud(9). Comparison of the theoretical data with the experimental ones shows that the ground state of the two-holes in the CuO4 doped cell is triplet. The last conclusion has been confirmed by analysis of CuL2,3-spectra of two-hole impurity states of doped CuO4 cell. Another interesting future of CuL2,3-spectra a peak 2.8 eV higher the threshold was aligned to the transitions into quasi-stationary states due to existence of a high barrier in the Cud-state potential.

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Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
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La-Sr and Pr-Sr polycrystalline manganite films: correlation between magneto-optical and transport properties / Yu. E. Samoshkina [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P6.7. - P. 315. - The work was supported partly by the Russian Foundation for Basic Researches, Grants Nos. 14-02-01211 and 16-32-00209 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
hole-doped manganites -- thin films -- magnetic circular dichroism -- metal-insulator transition

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Semenov, S. V.; Семёнов, Сергей Васильевич; Andreev, N. V.; Андреев Н. В.; Chichkov, V. I.; Чичков В.И.; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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    Zobov, V. E.
    On the concentration dependence of wings of spectra of spin correlation functions of diluted heisenberg paramagnets / V. E. Zobov, M. M. Kucherov // JETP Letters. - 2016. - Vol. 103, Is. 11. - P. 687-691, DOI 10.1134/S0021364016110138. - Cited References:26 . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
HIGH-TEMPERATURES
   AUTOCORRELATION FUNCTION
   SINGULAR POINT
   SYSTEMS
   TIME
   COORDINATE
   LATTICE
Аннотация: Singular points of the autocorrelation function on the imaginary time axis that is averaged over the location of spins in the magnetically dilute spin lattice with isotropic spin-spin interaction at a high temperature have been studied. For the autocorrelation function in the approximation of the self-consistent fluctuating local field, nonlinear integral equations have been proposed which reflect the separation of the inhomogeneous spin systems into close spins and other spins. The coordinates of the nearest singular points have been determined in terms of the radius of convergence of the expansion in powers of time, the coefficients of which have been calculated from recurrence equations. It has been shown that the coordinates of singular points and, consequently, the wings of the autocorrelation function spectrum at strong magnetic dilution are determined by the modulation of the local field by the nearest pairs of spins leading to its logarithmic concentration dependence.

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Публикация на русском языке Зобов, Владимир Евгеньевич. О концентрационной зависимости крыльев спектров спиновых корреляционных функций разбавленных гейзенберговских парамагнетиков [Текст] / В. Е. Зобов, М. М. Кучеров // Письма В ЖЭТФ. - Москва : Наука, 2016. - Т. 103 Вып. 11-12. - С. 780-784

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Space & Informat Technol, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Kucherov, M. M.; Зобов, Владимир Евгеньевич
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    Phase transitions in (NH4)2MoO2F4 crystal / A. Krylov [et al.] // J. Mol. Struct. - 2016. - Vol. 1124, Special Issue : Novel developments and applications of two-dimensional correlation spectroscopy — A festschrift in honor of professor Isao Noda. - P. 125-130, DOI 10.1016/j.molstruc.2016.03.009. - Cited References:17 . - ISSN 0022-2860. - ISSN 1872-8014
   Перевод заглавия: Фазовые переходы в кристалле (NH4)2MoO2F4

РУБ Chemistry, Physical
Рубрики:
OXYFLUORIDE
   (NH4)2WO2F4
   DISORDER
   DIAGRAMS
Кл.слова (ненормированные):
Phase transitions -- Raman high-pressure -- Two-dimensional correlations -- Oxyfluorides
Аннотация: The mechanisms of temperature and high pressure phase transitions have been studied by Raman spectroscopy. Room temperature (295 K) experiments under high hydrostatic pressure up to 3.6 GPa for (NH4)(2) MoO2 F-4 have been carried out. Experimental data indicates a phase transition into a new high-pressure phase for (NH4)(2) MoO2 F-4 at 1.2 GPa. This phase transition is related to the ordering anion octahedron groups [MoO2 F-4](2) and is not associated with ammonium group. Raman spectra of small non-oriented crystals ranging from 10 to 350 K have been observed. The experiment shows anion groups [MoO2 F-4](2-) and ammonium in high temperature phase are disordered. The phase transition at T-1 = 269.8 K is of the first-order, close to the tricritical point. The first temperature phase transition is related to the ordering anion octahedron groups [MoO2 F-4](2-). Second phase transitions T-2 = 180 K are associated with the ordering of ammonium. The data presented within this study demonstrate that 2D correlation analysis combined with traditional Raman spectroscopy are powerful tool to study phase transitions in the crystals. (C) 2016 Elsevier B.V. All rights reserved.

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Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Laptash, N. M.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; International Symposium on Two-Dimensional Correlation Spectroscopy(8th ; JUL 08-11, 2015 ; Vienna, Austria)
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10.

Loginov, V. M.
Brownian particle movement in statistical uniform-fields with finite-time of some correlation decrease / V. M. Loginov, V. E. Shapiro // Zhurnal Tek. Fiz. - 1981. - Vol. 51, Is. 1. - P. 40-45. - Cited References: 13 . - ISSN 0044-4642

РУБ Physics, Applied

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Доп.точки доступа:
Shapiro, V. E.; Шапиро, Владлен Ерахмилевич
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