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Вид документа : Однотомное издание
Шифр издания : В37/П 58 рукописный текст
Автор(ы) : Попов, Михаил Александрович
Заглавие : Влияние внутренней подвижности твердых тел на высокотемпературную динамику ядерных спинов : дис. на соиск. уч. степени д-ра физ.-мат. наук : 01.04.07
Выходные данные : Красноярск, 2000
Колич.характеристики :143 л.
Коллективы : Красноярский государственный университет, Российская академия наук, Сибирское отделение РАН, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Примечания : Библиогр.: 153 назв.
ГРНТИ : 29.19.37 + 29.19.49
ББК : В373.3я031
Экземпляры :ДС(1)
Свободны : ДС(1)
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Вид документа : Однотомное издание
Шифр издания : В37/П 58 рукописный текст
Автор(ы) : Попов, Михаил Александрович
Заглавие : Ядерная спин-решеточная релаксация в кристаллах со структурными фазовыми переходами : дис. на соиск. уч. степени канд. физ.-мат. наук : 01.04.03 : защищена 14.06.1985
Выходные данные : Красноярск, 1985
Колич.характеристики :94 л.
Коллективы : Академия наук СССР, Сибирское отделение АН СССР, Институт физики им. Л.В. Киренского Сибирского отделения АН СССР
Примечания : Библиогр.: 84 назв.
ГРНТИ : 29.19.15 + 29.19.37
ББК : В373.3я031 + В375.1я031
Экземпляры :ДС(1)
Свободны : ДС(1)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A., Zavislyak I. V., Movchan N. N., Gudim, I. A., Srinivasan G.
Заглавие : Mode splitting in 37-42 GHz barium hexaferrite resonator: Theory and device applications
Место публикации : IEEE Trans. Magn.: IEEE-Institute Electrical and Electronics Engineers, 2014. - Vol. 50, Is. 6. - Ст.4004507. - ISSN 0018-9464, DOI 10.1109/TMAG.2014.2298498. - ISSN 1941-0069
Примечания : Cited References: 34
Предметные рубрики: MILLIMETER-WAVE APPLICATIONS
GUIDE JUNCTION CIRCULATORS
FERRITE
MICROWAVE
PROPAGATION
CYLINDERS
Ключевые слова (''Своб.индексиров.''): dielectric resonance--ferromagnetic resonance (fmr)--hexagonal ferrite--isolator--phase shifter
Аннотация: Dielectric resonances in the 37-42 GHz frequency band in the single crystal barium hexaferrite that occur well below the ferromagnetic resonance (FMR) have been investigated. Sample dimensions have been chosen so that the mode frequency is lower than the spin-wave excitation (in this case, the natural domain resonance) frequency. Such dielectric mode frequencies, being a function of both permittivity and permeability, are magnetic field H tunable. Here, we report on below-FMR magnetodielectric resonance (MDR) axially magnetized barium hexaferrites and their H-tuning characteristics. Our studies reveal H-tuning by up to 2.5 GHz and the tuning is the largest when the ferrite is in a magnetically unsaturated state. A theory for the MDR is presented and a fairly good agreement between experimental data and theory has been obtained. Tunable millimeter wave phase shifters and isolators utilizing the below-FMR dielectric resonances have been demonstrated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A., Petrakovskii G. A., Bolsunovskaya O. A.
Заглавие : On the magnetic phase diagram of copper metaborate
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 5. - P909-912. - ISSN 1063-7834, DOI 10.1134/S106378340805017X
Примечания : Cited References: 6
Предметные рубрики: SOLITON LATTICE
CUB2O4
Аннотация: A stepwise transition from one incommensurate state of the spin system of a copper metaborate crystal to another incommensurate state was previously revealed using neutron scattering in an applied magnetic field. In this paper, the new state is interpreted as a combination of a commensurate state of one spin subsystem and an incommensurate state of another spin subsystem of the crystal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Bezmaternykh L. N., Bayukov O. A., Popov M. A., Schefer J., Neidermayer C., Aleshkevich P., Szymczak R.
Заглавие : Magnetic structure and magnetic excitations in the two-dimensional spin system of the Cu3B2O6 compound
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 7. - P1315-1320. - ISSN 1063-7834, DOI 10.1134/S1063783407070207
Примечания : Cited References: 21
Предметные рубрики: LONG-RANGE ORDER
HEISENBERG-MODEL
GROUND-STATE
GAP
ANTIFERROMAGNET
SRCU2(BO3)(2)
CUGEO3
CHAINS
CAV4O9
Аннотация: This paper reports on the results of measurements of the magnetic susceptibility, heat capacity, neutron scattering, muon spin relaxation, and electron paramagnetic resonance in Cu3B2O6 for the study of the ground state of the spin system of this compound. The results obtained suggest that, at a temperature of 10 K, the spin subsystem of the crystal, which consists of single spins and clusters of pairs and fours of spins interacting with one another, undergoes a transition to a state representing a superposition of the singlet (for clusters) and magnetically ordered (for single spins) states.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yasuda Y., Nakamura H., Fujii Y., Kikuchi H., Chiba M., Yamamoto Y., Hori H., Petrakovskii G. A., Popov M. A., Bezmaternykh L. N.
Заглавие : B-11-NMR study of low-temperature phase transition in CuB2O4
Разночтения заглавия :авие SCOPUS: 11B-NMR study of low-temperature phase transition in CuB 2O4
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2007. - Vol. 19: International Conference on Highly Frustrated Magnetism (AUG 15-19, 2006, Osaka, JAPAN), Is. 14. - Ст.145277. - ISSN 0953-8984, DOI 10.1088/0953-8984/19/14/145277
Примечания : Cited References: 10
Предметные рубрики: COPPER METABORATE
Ключевые слова (''Своб.индексиров.''): copper compounds--low temperature effects--magnetic field effects--nuclear magnetic resonance--b t phase diagram--dzialoshinskii moriya interaction--phase transitions
Аннотация: The material CuB2O4 presents a variety of phases in the B - T phase diagram, caused by the frustration and the Dzialoshinskii - Moriya interaction. In order to investigate the nature of the phase transitions, a B-11- NMR experiment on CuB2O4 has been performed under an applied magnetic field along the a- axis down to 0.4 K. A new incommensurate - incommensurate phase transition has been found at 0.8 K under a field of 0.5 T. Further, another phase transition has been observed at 4.7 K under a field of about 2 T, which is consistent with the transition reported by the neutron diffraction experiment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : Tree growth parameter in the Eden model on face-centered hypercubic lattices
Место публикации : Theor. Math. Phys. - 2005. - Vol. 144, Is. 3. - P.1361-1371. - ISSN 0040-5779, DOI 10.1007/s11232-005-0165-z
Примечания : Cited References: 19
Предметные рубрики: BRANCHED POLYMERS
HIGH-TEMPERATURES
EXPANSION
CLUSTERS
SYSTEMS
TIME
Ключевые слова (''Своб.индексиров.''): eden model--number of lattice trees--monte carlo method--growth parameter--singular points of generating function--large-dimension expansion--face-centered hypercubic lattice--eden model--face-centered hypercubic lattice--growth parameter--large-dimension expansion--monte carlo method--number of lattice trees--singular points of generating function
Аннотация: In the Eden model, we investigate how the tree growth parameter depends on the space dimension d for face-centered hypercubic lattices. We find the first three terms of the 1/d-expansion for this parameter directly from the generating function without calculating the number of trees because the growth parameter is the reciprocal coordinate of the singular point of the tree generating function. The same growth parameter was calculated by computer experiment where the ratios between the numbers of trees without intersections and trees without restrictions in the dimensions 3, 4, 6, 8, and 10 were estimated by the Monte Carlo method on face-centered cubic lattices. The results of the two methods agree well. Comparing with the previously performed computer experiment for simple hypercubic lattices, we observe that the values of the singular exponents for the tree generating functions are close for two different types of lattices.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov M. A., Petrakovskii G. A., Zinenko V. I.
Заглавие : Magnetic properties of copper metaborate: Two-parameter phenomenological model
Разночтения заглавия :авие SCOPUS: Magnetic Properties of Copper Metaborate: Two-Parameter Phenomenological Model
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 3. - P491-497. - ISSN 1063-7834, DOI 10.1134/1.1687867
Примечания : Cited References: 9
Предметные рубрики: SOLITON LATTICE
CUB2O4
FIELD
Аннотация: Symmetry analysis is performed for the magnetic subsystem of copper metaborate, and a phenomenological model is proposed with two two-component order parameters that correspond to ferromagnetism and antiferromagnetism vectors lying in the tetragonal plane of this crystal. Owing to the I (4) over bar 2d space group of symmetry of this crystal, the thermodynamic potential contains the Lifshitz invariant having the form of an antisymmetric product of the order parameters and their spatial derivatives. Analysis of this model shows that the temperatures of ordering in the magnetic subsystem and of the formation of a spiral structure in it can be different. This fact allows numerical calculation of the temperature dependences of the spiral wave vector, magnetization, and intensities of first- and third-order magnetic satellites in the incommensurate phase that arise in neutron elastic scattering, as well as the field dependence of the magnetization. The experimental data, including a magnetic-field-temperature phase diagram, are satisfactorily described. The parameters of the phenomenological thermodynamic potential of the magnetic subsystem of copper metaborate are estimated. (C) 2004 MAIK "Nauka / Interperiodica".
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : The coordinate of the singular point of generating functions of clusters in the high-temperature dynamics of spin lattice systems with axially symmetric interaction
Место публикации : Theor. Math. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2003. - Vol. 136, Is. 3. - P1297-1311. - ISSN 0040-5779, DOI 10.1023/A:1025603416535
Примечания : Cited References: 25
Предметные рубрики: CONSISTENT FLUCTUATING FIELD
NUCLEAR-DOUBLE-RESONANCE
HEISENBERG PARAMAGNET
LINE SHAPE
RELAXATION
SPECTRUM
APPROXIMATION
CRYSTALS
MOMENT
CAF2
Ключевые слова (''Своб.индексиров.''): 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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