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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., POPOV M. A.
Заглавие : Dynamics in the systems with the 3-spin coupling induced by the strong radiofrequency field
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1993. - Vol. 103, Is. 6. - P.2129-2141. - ISSN 0044-4510
Примечания : Cited References: 24
Предметные рубрики: RESONANCE
LINE
Аннотация: The dynamics of the crystal nucleus spin system in constant and continuous strong radiofrequency magnetic fields is studied. The variation of the relaxation properties of the magnetization perpendicular to the effective field is studied with changing the field orientation in the rotating frame of coordinates and with changing the relation in the mean hamiltonian of two- and three-spin dipole-dipole couplings. The third and fourth moments of the NMR spectrum in the rotating frame of coordinates and the free precession fall are calculated by means of the memory function. The connection between the three-spin coupling and the features of such falls observed in the experiments under magic angle and bias from it is explained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A., Aleksandrova I. P., Primak S. V.
Заглавие : Effect of fluctuations on the NQR spectrum in the incommensurate phase of a Cs2ZnI4 crystal
Место публикации : JETP Letters. - 1994. - Vol. 59, Is. 7. - P.485-487. - ISSN 0021-3640
Примечания : Cited References: 5
Аннотация: The direct spin-lattice relaxation due to local thermal fluctuations of the amplitude of the atomic-displacement wave -in the incommensurate phase of a crystal can strongly influence the lineshape of the resonant spectrum, reducing the intensity of the outermost temperature-dependent peaks in the frequency distribution, while having essentially no effect on the temperature-independent features of this distribution. This effect is apparently the reason for the anomalous behavior of the NQR spectrum of I-127 in Cs2ZnI4 in a certain temperature interval near the transition from the ''normal'' phase to the incommensurate phase.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A.
Заглавие : Nuclear-spin-lattice relaxation in the incommensurate phase of crystals
Место публикации : Fiz. Tverd. Tela. - 1984. - Vol. 26, Is. 3. - P.948-949. - ISSN 0367-3294
Примечания : Cited References: 5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mefed A. E., Yaroslavtsev A. V., Zobov V. E., Ponomarenko A. V., Popov M. A.
Заглавие : Вecay of the free precession of nuclear spins in a solid in a rotating coordinate system under magic-angle conditions - 3-spin interactions
Место публикации : JETP Letters. - 1992. - Vol. 55, Is. 7. - P.418-423. - ISSN 0021-3640
Примечания : Cited References: 15
Предметные рубрики: LINE
Аннотация: Experiments show that the signal representing the decay of the free precession of nuclear spins of F-19 in a CaF2 crystal decreases in a monotonic fashion, without oscillations, in a rotating coordinate system under magic-angle conditions. The decrease is thus fundamentally different from that in the laboratory coordinate system. When a deviation from the magic angle is introduced, oscillations appear in the precession-decay signal. These oscillations are distinctive in that the signal does not reach zero at the first few minima. These features of the free-precession decay are explained on the basis that the nuclear dipole-dipole interactions in the rotating coordinate system under magic-angle conditions are fundamentally different from those in the laboratory system. Theoretical predictions agree qualitatively with the experimental results.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nakamura H., Fujii Y., Kikuchi H., Chiba M., Yamamoto Y., Hori H., Petrakovskii G. A., Popov M. A., Bezmaternykh L. N.
Заглавие : NMR study of the successive phase transitions in CuB2O4
Коллективы : International Symposium on Quantum Spin Systems
Место публикации : Prog. Theor. Phys. Suppl. - 2005. - Is. 159. - P.360-364. - ISSN 0375-9687
Примечания : Cited References: 8
Предметные рубрики: COPPER METABORATE
Аннотация: Nuclear magnetic resonance (NMR) experiments on copper metaborate CuB2O4 are performed in order to study the successive phase transitions which includes the transition from the paramagnetic to the commensurate weak ferromagnetic phase at T-N = 21 K and further transition to the incommensurate helix phase at T* similar to 10 K. B-11-NMR spectra obtained for three crystal orientations (B parallel to [001], [110], [100]) were split into several lines below T-N and changed into more complicated line shapes below T*. The results of the angular dependence of the spectrum in the commensurate phase and the nuclear spin-lattice relaxation rate T-1(-1) are also discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorotynov A. M., Abramova G. M., Popov M. A., Petrakovskii G. A., Bovina A. F., Sokolov V. V., Mita E.
Заглавие : Magnetic resonance in FexMn1-xS single crystals
Коллективы : SB RAS-INTAS [06-1000013-9002]; JSPS KAKENHI [18540317]
Место публикации : J. Appl. Phys. - 2009. - Vol. 106, Is. 7. - Ст.73909. - ISSN 0021-8979, DOI 10.1063/1.3234402
Примечания : Cited References: 11. - This study was supported by the SB RAS-INTAS (Grant No. 06-1000013-9002) and the JSPS KAKENHI (Grant No. 18540317).
Ключевые слова (''Своб.индексиров.''): experimental studies--ferromagnetic particles--first-order--iron nanoparticles--manganese sulfide--mean diameter--randomly distributed--resonance spectrum--s-matrix--superparamagnetics--computer simulation--manganese--manganese compounds--resonance--superparamagnetism--single crystals
Аннотация: The results of the experimental study and computer simulation of the resonance spectra of a single crystal of the iron-manganese sulfide FexMn1-xS (0 = 6.19 nm at T=250 K) and the axial first-order anisotropy constant (K-1 = 4.08 erg/cm(3) at T=250 K) of the ferromagnetic particles are determined. The volume fraction of the iron phase is estimated. (C) 2009 American Institute of Physics. [doi:10.1063/1.3234402]
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A.
Заглавие : Gaussian approximation in the ising-model with long-range interaction
Место публикации : Theor. Math. Phys. - 1990. - Vol. 83, Is. 3. - P.658-663. - ISSN 0040-5779, DOI 10.1007/BF01018036
Примечания : Cited References: 7
Аннотация: The infinite hierarchy of equations for the cumulants of the correlation functions of the longitudinal spin components in the Ising model with long-range interaction corresponding to a Gaussian form of the spectral density is investigated. The invariance of the cumulants with respect to permutation of the vertices is used to decouple the hierarchy. A phase transition of the second kind is described by the obtained system of equations for the cumulants of the first three orders in a three-dimensional model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Krasnov P. O., Kozhevnikov T. A., Popov M. A.
Заглавие : Calculation of the energy of binding of titanium and scandium complexes to the surface of carbon nanotubes
Коллективы : Analytical departmental program "Development of Higher Education Potential" [2.1.1/2584]; Russian Foundation for Basic Research [09-02-00324-a]
Место публикации : Russ. J. Phys. Chem. B. - 2009. - Vol. 3, Is. 4. - P.679-683. - ISSN 1990-7931, DOI 10.1134/S1990793109040289
Примечания : Cited References: 27. - This work was supported by the analytical departmental program "Development of Higher Education Potential (2009-2100)" (grant 2.1.1/2584) and by the Russian Foundation for Basic Research, project no. 09-02-00324-a.
Предметные рубрики: MOLECULAR-HYDROGEN COMPLEXES
STORAGE
TEMPERATURE
TRANSITION
DYNAMICS
METALS
Аннотация: Complexes of zigzag-type carbon nanotubes (CNTs) with transition metal atoms, scandium and titanium, were studied. It was demonstrated that the energy of binding of both atoms with a carbon surface decreases whereas the rate of diffusion along the surface increases with increasing nanotube diameter. The rate constant of migration of scandium atoms over a CNT surface are several orders of magnitude higher than that for titanium atoms, because the CNT surface-Sc atom binding energy is substantially lower.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Popov M. A., Balaev A. D., Sablina K. A., Bayukov O. A., Velikanov D. A., Vorotynov A. M., Bovina A. F., Vasil'ev A. D., Boehm M.
Заглавие : Magnetic properties of Pb2Fe2Ge2O9 single crystals
Место публикации : Phys. Solid State. - 2009. - Vol. 51, Is. 9. - P.1853-1858. - ISSN 1063-7834, DOI 10.1134/S1063783409090145
Примечания : Cited References: 10
Предметные рубрики: MULTIFERROICS
Аннотация: Single crystals of Pb2Fe2Ge2O9 have been grown. They were subjected to X-ray diffraction, magnetic, neutron diffraction, Mossbauer and spin resonance studies. It has been established that Pb2Fe2Ge2O9 is a weak ferromagnet with a N,el temperature T (N) = 46 K, and the exchange and spin-flop transition fields have been estimated. It has been demonstrated that the weak ferromagnetic moment is actually the result of the single-ion anisotropy axes for the magnetic moments of different magnetic sublattices being not collinear.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Кубарев, Юрий Григорьевич, Попов, Михаил Александрович
Заглавие : Аномальная спин-решеточная релаксация в полидисперсных сегнетоэлектриках типа порядок-беспорядок
Коллективы : Всесоюзный симпозиум по магнитному резонансу
Место публикации : Всесоюзный симпозиум по магнитному резонансу: тезисы докладов. - Пермь, 1979. - С. 27
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kawamata T., Sugawara N., Haidar S. M., Adachi T., Noji T., Kudo K., Kobayashi N., Fujii Yu., Kikuchi H., Chiba M., Petrakovskii G. A., Popov M. A., Bezmaternykh L. N., Koike Yo.
Заглавие : Thermal conductivity and magnetic phase diagram of CuB2O4
Место публикации : J. Phys. Soc. Jpn. - 2019. - Vol. 88, Is. 11. - Ст.114708. - ISSN 0031-9015 (ISSN), DOI 10.7566/JPSJ.88.114708. - ISSN 1347-4073 (eISSN)
Примечания : Cited References: 42. - This work was supported by a Grant-in-Aid for Scientific Research of the Ministry of Education, Culture Sports, Science and Technology, Japan, (Grant Number 17038002) and also by CREST of Japan Science and Technology Corporation.
Аннотация: We have measured temperature and magnetic field dependences of the thermal conductivity along the c-axis, κc, and that along the [110] direction, κ110, of CuB2O4 single crystals in zero field and magnetic fields along the c-axis and along the [110] direction. It has been found that the thermal conductivity is nearly isotropic and very large in zero field and that the thermal conductivity due to phonons is dominant in CuB2O4. The temperature and field dependences of κc and κ110 have markedly changed at phase boundaries in the magnetic phase diagram, which has been understood to be due to the change of the mean free path of phonons caused by the change of the phonon-spin scattering rate at the phase boundaries. It has been concluded that thermal conductivity measurements are very effective for detecting magnetic phase boundaries.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Nakamura H., Fujii Y., Kikuchi H., Chiba M., Yamamoto Y., Hori H., Petrakovskii G. A., Popov M. A., Bezmaternykh L. N.
Заглавие : NMR study of successive phase transition in CuB2O4
Коллективы : Российская академия наук, Научный совет по физике конденсированных сред РАН, Научный совет РАН по физике низких температур, Сибирское 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", "Trends in magnetism", Euro-Asian Symposium
Место публикации : EASTMAG-2004: abstract book/ org. com. K. S. Aleksandrov [et al.]. - Krasnoyarsk, 2004. - Sect.: Fundamental magnetic properties. - P.51
Примечания : Cited References: 1
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Popov M. A., Bolsunovskaya O. A., Petrakovskii G. A.
Заглавие : Peculiapities of properties of cooper metaborate in a zero magnetic field
Коллективы : Российская академия наук, Научный совет по физике конденсированных сред РАН, Научный совет РАН по физике низких температур, Сибирское 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", "Trends in magnetism", Euro-Asian Symposium
Место публикации : EASTMAG-2004: abstract book/ org. com. K. S. Aleksandrov [et al.]. - Krasnoyarsk, 2004. - Sect.: Fundamental magnetic properties. - P.48
Примечания : Cited References: 1
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : Spin-array relaxation of the nuclear magnetic system of solid states with multi-spin interactions generated by modulated intense radiofrequent fields
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1996. - Vol. 110, Is. 2. - P635-660. - ISSN 0044-4510
Примечания : Cited References: 24
Предметные рубрики: NMR
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A., Kubarev Y. G.
Заглавие : Spin-lattice relaxation in ferroelectrics described by Kobayashi model
Место публикации : Fiz. Tverd. Tela. - 1983. - Vol. 25, Is. 7. - P.2193-2196. - ISSN 0367-3294
Примечания : Cited References: 15
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kubarev Y. G., Popov M. A.
Заглавие : Microscopic mechanism for spin-lattice relaxation in the region of ferroelectric phase-transitions
Место публикации : Izvestiya Akademii nauk SSSR Seriya Fizicheskaya. - 1984. - Vol. 48, Is. 6. - P.1073-1076. - ISSN 0367-6765
Примечания : Cited References: 15
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A., Zobov V. E.
Заглавие : Line shape of magnetic resonance in the Anderson approximation with consideration of quadratic fluctuations
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1996. - Vol. 38, Is. 10. - P3070-3074. - ISSN 0367-3294
Примечания : Cited References: 12
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Spevakova I. P., Fedoseeva N. V., Popov M. A., Mydlyazh T.
Заглавие : Some peculiarities of magnetic-behavior of NaMnCl3
Место публикации : Fiz. Tverd. Tela. - 1981. - Vol. 23, Is. 2. - P.513-519. - ISSN 0367-3294
Примечания : Cited References: 20
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : On the radius of convergence of series in powers of time for spin correlation functions of the Heisenberg magnet at high temperature
Место публикации : Theor. Math. Phys.: PLENUM PUBL CORP, 1997. - Vol. 112, Is. 3. - P1182-1191. - ISSN 0040-5779, DOI 10.1007/BF02583049
Примечания : Cited References: 22
Предметные рубрики: AUTO-CORRELATION FUNCTION
INFINITE-TEMPERATURE
PARAMAGNET
DYNAMICS
MODEL
Аннотация: The convergence of series in powers of time for spin autocorrelation functions of the Heisenberg magnet are investigated at infinite temperatures on lattices of different dimensions d. The calculation data available at the present time for the coefficients of these series are used to estimate the corresponding radii of convergence, whose growth with decreasing d is revealed and explained in a self-consistent approximation. To this end, a simplified nonlinear equation corresponding to this approximation is suggested and solved for the autocorrelation function of a system with an arbitrary number Z of nearest neighbors. The coefficients of the expansion in powers of time for the solution are represented in the form of trees on the Bethe lattice with the coordination number Z. A computer simulation method is applied to calculate the expansion coefficients for trees embedded in square, triangular, and simple cubic lattices under the condition that the intersection of tree branches is forbidden. It is found that the excluded volume effect that manifests itself in a decrease in these coefficients and in an increase in the coordinate and exponent of the singularity of the autocorrelation function on the imaginary time axis is intensified with decreasing lattice dimensions.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : The coordinate of a singular point of the time correlation functions for a heteronuclear spin system of a crystal
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2005. - Vol. 100, Is. 4. - P775-783. - ISSN 1063-7761, DOI 10.1134/1.1926438
Примечания : Cited References: 24
Предметные рубрики: FLUCTUATION SPECTRUM
CROSS-RELAXATION
NMR ABSORPTION
SHAPE
WINGS
LINE
Ключевые слова (''Своб.индексиров.''): correlation methods--crystal lattices--crystallography--functions--integral equations--lithium compounds--nuclear magnetic resonance--quantum theory--random processes--autocorrelation functions (acf)--dipole-dipole interactions (ddi)--heteronuclear spin systems--self-consistent fluctuating field (scff)--crystals
Аннотация: The singularities of the time autocorrelation functions (ACFs) for a heteronuclear spin system of a crystal are investigated. Exact expressions are obtained for ten moments of the spectra of ACFs in the approximation of a self-consistent fluctuating field (SCFF) with arbitrary axial symmetry. These expressions are applied to determine the coordinate of the lowest singular point of these functions on the imaginary-time axis for a spin system with a dipole-dipole interaction (DDI). The leading corrections to this coordinate due to the correlation of local fields in real crystals are calculated. These corrections are determined by lattice sums with triangles of four bonds and pairs of four bonds. Numerical values of the coordinate are obtained for a LiF crystal in a magnetic field directed along three crystallographic axes. An increase in the coordinate of the singular point, which follows from the theory and leads to a faster falloff of the wings of the ACF spectra, qualitatively agrees with experiment. © 2005 Pleiades Publishing, Inc.
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