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Zobov, V. E.
Second moment of multiple-quantum NMR and a time-dependent growth of the number of multispin correlations in solids / V. E. Zobov, A. A. Lundin // J. Exp. Theor. Phys. - 2006. - Vol. 103, Is. 6. - P. 904-916, DOI 10.1134/S1063776106120089. - Cited References: 39 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
NUCLEAR-MAGNETIC-RESONANCE
   LINE-SHAPE
   SPIN SYSTEMS
   DYNAMICS
   SPECTRA
   COHERENCES
   STATE
   BEHAVIOR
   CRYSTAL
   MODEL
Кл.слова (ненормированные):
Correlation methods -- Mathematical models -- Nuclear magnetic resonance spectroscopy -- Spectrum analysis -- Time series analysis -- Four-spin time correlation -- Multispin correlations -- Second moment -- Time power series -- Quantum theory
Аннотация: The time evolution of multispin correlations (the growth of the number of correlated spins as a function of time) can be observed directly using the multiple-quantum nuclear magnetic resonance spectroscopy of solids. A quantity related to this number, namely, the second moment of the intensity distribution of coherences of different orders in the multiple-quantum spectrum can be calculated using the theory proposed in this work. An approach to the calculation of the four-spin time correlation function through which this moment is expressed is developed. The main sequences of contributions in the expansion of this function into a time power series are summed using the approximation of a large number of neighbors both for systems with a secular dipole-dipole interaction and for systems with a nonsecular effective interaction. An exponential dependence of is obtained. The value of is additionally calculated using an expansion in terms of orthogonal operators for three model examples corresponding to different limiting realizations of spin systems. It is shown that the results of the microscopic theory at least qualitatively agree with both the results obtained for model examples and experimental results obtained recently for adamantane.

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Semenov Inst Chem Phys, Moscow 117977, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 117977, Russian Federation

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
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Zobov, V. E.
On the Second Moment of the Multiquantum NMR Spectrum of a Solid / V. E. Zobov, A. A. Lundin // Russ. J. Phys. Chem. B. - 2008. - Vol. 2, Is. 5. - P. 676-683, DOI 10.1134/S1990793108050035. - Cited References: 39 . - ISSN 1990-7931

РУБ Physics, Atomic, Molecular & Chemical
Рубрики:
MULTIPLE-QUANTUM NMR
   DEPENDENT BEHAVIOR
   MAGNETIC-MOMENTS
   SPIN CLUSTERS
   LINE-SHAPE
   DYNAMICS
   COHERENCES
   SYSTEMS
   CRYSTAL
   GROWTH
Аннотация: New experimental data on the time dependence of an increase in the number of correlated spins under the conditions of the observation of the multiquantum NMR spectrum of a solid are processed on the basis of a microscopic theory for describing the growth of the second moment of multiquantum NMR developed by us earlier. As follows from the theory, the growth is an exponential function of time for crystals with quite diverse structures. The results are discussed on the basis of semiphenomenological models.

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Держатели документа:
[Zobov, V. E.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Lundin, A. A.] Russian Acad Sci, NN Semenov Chem Phys Inst, Moscow 117977, Russia
ИФ СО РАН

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
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Zinenko, V. I.
Lattice dynamics of BiFeO3 under hydrostatic pressure / V. I. Zinenko, M. S. Pavlovskii // Phys. Solid State. - 2009. - Vol. 51: 18th All-Russia Conference on Physics of Ferroelectrics (VKS-XVIII) (JUN 09-14, 2008, St Petersburg, RUSSIA), Is. 7. - P. 1404-1408, DOI 10.1134/S1063783409070208. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL
Аннотация: The vibrational frequencies of the BiFeO3 crystal lattice in the cubic phase (Pm3m) and the rhombohedral paraelectric phase (R3c) are calculated in terms of the ab initio model of an ionic crystal with the inclusion of the dipole and quadrupole polarizabilities. In the ferroelectric phase with the symmetry R3c, the calculated spontaneous polarization of 136 mu C cm(-2) agrees well with the experimental data. The dependences of the unit cell volume, the elastic modulus, and the vibrational frequencies on the pressure are calculated. It is found that the frequency of an unstable ferroelectric mode in both the cubic (Pm3m) and rhombohedral (R3c) phases are almost independent of the applied pressure, in contrast to classical ferroelectrics with a perovskite structure, where the ferroelectric instability is very sensitive to a variation in the pressure.

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Держатели документа:
[Zinenko, V. I.
Pavlovskii, M. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Pavlovskii, M. S.; Павловский, Максим Сергеевич; Зиненко, Виктор Иванович
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Ultrashort pulses characterization by nonlinear diffraction from virtual beam / A. S. Aleksandrovsky [et al.] // Appl. Phys. Lett. - 2011. - Vol. 98, Is. 6. - Ст. 61104, DOI 10.1063/1.3554370. - Cited References: 14. - The work was supported by Ministry of Education and Science of Russian Federation (Contract No. 16.740.11.0150); Grant of President of Russian Federation for support of leading scientific schools Grant No. SS-4645.2010.2; Grant No. RNP.2.1.1.3455 and Projects 2.5.2 and 3.9.1 of PSB RAS; and Projects Nos. 27.1 and 5 of SB RAS. A. M. Vyunishev is grateful for support from Carl Zeiss Grant and from Krasnoyarsk Regional Fund of Science and Technical Activity Support. . - ISSN 0003-6951

РУБ Physics, Applied
Рубрики:
CRYSTAL
SRB4O7
Кл.слова (ненормированные):
Broad spectral -- Frequency-doubling -- Noncollinear -- Nonlinear diffraction -- Nonlinear photonic crystals -- Short-wavelength -- Tetraborate -- Ultrafast diagnostics -- Diffraction -- Light propagation -- Strontium -- Ultrashort pulses -- Photonic crystals
Аннотация: Noncollinear frequency doubling in a random nonlinear photonic crystal of strontium tetraborate via nonlinear diffraction from virtual beam is investigated. This effect is shown to be useful for ultrashort pulses characterization in broad spectral range. Nonlinear photonic crystals of strontium tetraborate are a promising medium for ultrafast diagnostics in short-wavelength applications. (C) 2011 American Institute of Physics. [doi:10.1063/1.3554370]

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Держатели документа:
[Aleksandrovsky, A. S.
Vyunishev, A. M.
Zaitsev, A. I.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Aleksandrovsky, A. S.
Vyunishev, A. M.
Zaitsev, A. I.
Ikonnikov, A. A.
Pospelov, G. I.] Siberian Fed Univ, Krasnoyarsk 660079, Russia
ИФ СО РАН
L. V. Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, 660079 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Vyunishev, A. M.; Вьюнышев, Андрей Михайлович; Zaitsev, A. I.; Зайцев, Александр Иванович; Ikonnikov, A. A.; Pospelov, G. I.
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    Tunable femtosecond frequency doubling in random domain structure of strontium tetraborate / A. S. Aleksandrovsky [et al.] // Opt. Commun. - 2009. - Vol. 282, Is. 11. - P. 2263-2266, DOI 10.1016/j.optcom.2009.02.070. - Cited Reference Count: 16. - Гранты: The work was supported by the RFBR Grant 09-02-00670, Grants of the President of the Russian Federation for the support of leading scientific schools (Nos. SS-1011.2008.2 and SS-3818.2008.3), Grant No. RNP.2.1.1.3455, and the Projects 2.5.2 of PSB RAS, Nos. 5 and 27.1 of SB RAS. - Финансирующая организация: RFBR [09-02-00670]; President of the Russian Federation [SS-1011.2008.2, SS-3818.2008.3]; PSB RAS [2.5.2]; SB RAS [5, 27.1]; [RNP.2.1.1.3455] . - ISSN 0030-4018
Рубрики:
2ND-HARMONIC GENERATION
   HARMONIC-GENERATION
   BARIUM NIOBATE
   CRYSTAL
Кл.слова (ненормированные):
Domain structures -- Femtosecond -- Frequency-doubling -- Harmonic frequencies -- Noncollinear -- Nonlinear photonic crystals -- Photonic structures -- Second harmonics -- Second-harmonic generations -- Spatial spectrum -- Tetraborate -- Harmonic generation -- Photonic crystals -- Strontium -- Harmonic analysis
Аннотация: Efficient tunable femtosecond phase-matched noncollinear second-harmonic generation in randomized nonlinear photonic crystal of strontium tetraborate is obtained. Spatial spectrum of nonlinear photonic structure is not flat but enables tuning of the harmonic frequency in the range from 355 to 460 nm. The narrowing of the bandwidth of second harmonic is found to be of order of 10-20%. (C) 2009 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, SB, LV Kirensky Phys Inst, Coherent Opt Lab, Krasnoyarsk 600036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Aleksandrovsky, A.S.; Vyunishev, A. M.; Вьюнышев, Андрей Михайлович; Zaitsev, A.I.; Zamkov, A. V.; Замков, Анатолий Васильевич; Slabko, V.V.
}
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The magnetoelectric MEE-effect in the SmFe3(BO3)4 multiferroic in dc and ac electric fields / A. L. Freydman [et al.] // J. Appl. Phys. - 2018. - Vol. 124, Is. 13. - Ст. 134101, DOI 10.1063/1.5044598. - Cited References:22. - This work was supported by the Russian Foundation for Basic Research, projects no. 17-32-50043_mol_nr and no. 18-02-00696_a. . - ISSN 0021-8979. - ISSN 1089-7550

РУБ Physics, Applied
Рубрики:
CRYSTAL
Аннотация: The inverse magnetoelectric MEE-effect in the SmFe3(BO3)4 single-crystal sample in an applied electric field has been studied. The electric field E consists of two components: a constant one, e0, and a variable one, e × cos(ωt). The investigated compound evokes great interest due to the existence of both linear and quadratic contributions to the magnetoelectric effect. According to theoretical analysis, the effective susceptibility of the first harmonic of magnetic moment oscillations depends on the dc electric field component e0. Indeed, according to the measurement data, the dc field e0 significantly affects the MEE-effect first-harmonic amplitude: depending on the e0 sign, these oscillations can be either amplified or suppressed. This offers an opportunity for controlling the magnetic moment oscillation amplitude at the applied electric field frequency, including the signal modulation, which is promising for application. In the applied dc field e0, a slight change in the susceptibility of the MEE-effect term quadratic to the electric field was detected. The mathematical apparatus used correctly describes the qualitative dependence of the MEE-effect amplitude on the dc field e0, while the quantity appears to be approximately twofold overestimated.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Inst Spect, Troitsk 108840, Russia.
Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Oblast, Russia.

Доп.точки доступа:
Freydman, A. L.; Фрейдман, Александр Леонидович; Erofeev, D. A.; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Research [17-32-50043_mol_nr, 18-02-00696_a]
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Synthesis and study of structural, thermodynamic, and magnetic properties of NaxLi1–xFeGe2O6 (x = 0.1–0.9) compounds / T. V. Drokina [et al.] // Phys. Solid State. - 2016. - Vol. 58, Is. 7. - P. 1361-1370, DOI 10.1134/S1063783416070143. - Cited References: 20 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CLINOPYROXENE-TYPE LiFeGe2O6
   PHASE-TRANSITION
   PYROXENES
   TEMPERATURE
   LiFeSi2O6
   CRYSTAL
Аннотация: The properties of NaxLi1–xFeGe2O6 (x = 0.1–0.9) solid solutions obtained via a solid-phase synthesis have been measured by X-ray diffraction, calorimetry, and magnetic method. The order–disorder transformations in low-dimensional NaxLi1–xFeGe2O6 (x = 0.1–0.9) spin systems with predominately antiferromagnetic exchange interaction have been revealed in the low-temperature susceptibility dependences. The study of thermal and physical properties has confirmed that substituting the sodium ions with the lithium ones induces the first-order structural phase transitions of the displacement type which are characterized by a symmetry change in monoclinic crystals from high-temperature C2/c space group to low-temperature P21/c space group. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Синтез и исследование структурных, термодинамических и магнитных особенностей соединений NaxLi1-xFeGe2O6 (x=0.1-0.9) [Текст] / Т. В. Дрокина [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 7. - С. 1316–1324

Держатели документа:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50-38, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, ul. Serysheva 47, Khabarovsk, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Drokina, T. V.; Дрокина, Тамара Васильевна; Petrakovskii, G. A.; Петраковский, Герман Антонович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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    Synthesis and molecular structure of cobalt(II) complex with 1-(1-silatranylmethyl)-1,2,4-triazole / A. D. Vasiliev [et al.] // Struct. Chem. - 2013. - Vol. 24, Is. 4. - P. 1001-1005, DOI 10.1007/s11224-012-0121-0. - Cited References: 24 . - ISSN 1040-0400
   Перевод заглавия: Синтез и молекулярная структура комплекса кобальта(II) с 1-(1-силатранилметил)-1,2,4-триазолом

РУБ Chemistry, Multidisciplinary + Chemistry, Physical + Crystallography
Рубрики:
REACTIVITY
   DERIVATIVES
   CRYSTAL
   SPECTRA
Кл.слова (ненормированные):
Complexes -- 1-(1-Silatranylmethyl)-1,2,4-triazole -- Cobalt dichloride -- X-ray diffraction
Аннотация: Reaction of cobalt chloride with 1-(1-silatranylmethyl)-1,2,4-triazole in benzene afforded complex CoCl2 center dot 2L (L = 1-(1-silatranylmethyl)-1,2,4-triazole). It was isolated as the solvate [CoCl2 center dot 2L]center dot CH2Cl2 (1) by recrystallization from dichloromethane and structurally characterized by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group P2(1)/m with a = 6.798(2) E, b = 20.326(5) E, c = 11.005(3) E, and Z = 4. The cobalt atom is in slightly distorted square-planar environment, coordinated to two nitrogen atoms from two ligands and two chloride ions.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
East Siberian State Academician Educ, Irkutsk 664011, Russia
Russian Acad Sci, Siberian Branch, AE Favorsky Irkutsk Inst Chem, Irkutsk 664033, Russia

Доп.точки доступа:
Vasiliev, A. D.; Васильев, Александр Дмитриевич; Zel'bst, E. A.; Soldatenko, A. S.; Bolgova, Yu.I.; Trofimova, O. M.; Voronkov, M. G.
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Study of electrical and thermoelecrical properties of sulfides TmxMn1-xS / S. S. Aplesnin [et al.] // Phys. Solid State. - 2016. - Vol. 58, Is. 1. - P. 19-24, DOI 10.1134/S1063783416010029. - Cited References: 25. - This study was supported by the Russian Foundation for Basic Research (project no. 15-42-04099 r_si-bir_a) and State Contract no. 114090470016. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SmxMn1-xS solid-solutions
   MnS
   Gd
   Transition
   Transport
   Crystal
Аннотация: Variable-valence TmxMn1–xS (0 ⩽ x ⩽ 0.15) compounds have been synthesized and their structural, electrical, and thermoelectrical properties have been studied in the temperature range of 80–1100 K. The regions of existence of solid solutions of sulfides TmxMn1–xS with the NaCl-type fcc lattice have been determined. It has been found that, as thulium ions are substituted for manganese cations, the electrical resistivity increases, and the lattice parameter increases more sharply than that corresponding to the Vegard’s law. The study of the temperature dependences of the thermopower coefficient has revealed that the current carrier sign is retained to 500 K for all the substitution concentrations, and the charge carrier type changes from the hole type to the electron type with variations in the temperature. The experimental data have been explained in terms of the exciton model.

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Публикация на русском языке Исследование электрических и термоэлектрических свойств сульфидов TmxMn1-xS [Текст] / С. С. Аплеснин [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 1. - С. 21-26

Держатели документа:
Kirensky Institute of Metals, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50–38, Krasnoyarsk, Russian Federation
Reshetnikov Siberian Aerospace University, pr. imeni Gazety “Krasnoyarskii Rabochii” 31, Krasnoyarsk, Russian Federation
Scientific–Practical Materials Centre, National Academy of Sciences of Belarus, ul. P. Brovki 19, Minsk, Belarus
Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Romanova, O. B.; Романова, Оксана Борисовна; Galyas, A. I.; Sokolov, V. V.
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10.

Spectral fringes in non-phase-matched SHG and refinement of dispersion relations in the VUV / P. Trabs [et al.] // Opt. Express. - 2015. - Vol. 23, Is. 8. - P. 10091-10096, DOI 10.1364/OE.23.010091. - Cited References:11 . - ISSN 1094-4087

РУБ Optics
Рубрики:
2ND-HARMONIC GENERATION
   CRYSTAL
   STRONTIUM
   SrB4O7
Аннотация: We consider second harmonic generation (SHG) of ultrashort pulses in the case of strong phase- and group-velocity mismatch. Spectral fringes appear in the second harmonic related to two delayed replicas of the fundamental pulse in the time domain. The fringe separation can be used to evaluate the group-velocity and refractive index of nonlinear crystals at extreme wavelengths. Experimental results with femtosecond pulses in SrB4O7 (SBO) are used to refine the Sellmeier equation describing the nc refractive index down to 160 nm, essential for the use of this unique nonlinear crystal for random quasi-phase-matching in the VUV.

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Держатели документа:
Max Born Inst Nonlinear Opt & Ultrafast Spect, D-12489 Berlin, Germany.
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Trabs, Peter; Noack, Frank; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Zaitsev, A. I.; Зайцев, Александр Иванович; Radionov, N. V.; Радионов, Никита Вячеславович; Petrov, V.
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