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Zobov, V. E.
A Monte Carlo study of the dependence of the growth parameter for trees on the lattice dimension in the Eden model / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2001. - Vol. 126, Is. 2. - P. 270-279, DOI 10.1023/A:1005260114182. - Cited References: 17 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
DIFFUSION-LIMITED AGGREGATION
   BRANCHED POLYMERS
   HIGH-TEMPERATURES
   EXPANSION
   TIME
Аннотация: We use the Monte Carlo method to compute the number of trees with n edges in the Eden model on d-dimensional simple cubic lattices for d = 2, 3, 4, 6, 8, 10. We compare these numbers with the exact data derived by the enumeration method up to n = 12 on the square lattice and up to n = 10 on the cubic lattice. We find that for d greater than or equal to 3, the computed values of the growth parameter for trees agree with the values that we derived earlier by the expansion in inverse powers of 2d - 1.

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Держатели документа:
RAS, Siberian Branch, Kirenskii Phys Inst, Krasnoyarsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirenskii Physics Institute, Siberian Branch, RAS, Krasnoyarsk, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
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B-11-NMR study of low-temperature phase transition in CuB2O4 / Y. . Yasuda [et al.] // J. Phys.: Condens. Matter. - 2007. - Vol. 19: International Conference on Highly Frustrated Magnetism (AUG 15-19, 2006, Osaka, JAPAN), Is. 14. - Ст. 145277, DOI 10.1088/0953-8984/19/14/145277. - Cited References: 10 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
COPPER METABORATE
Кл.слова (ненормированные):
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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Держатели документа:
Univ Fukui, Dept Appl Phys, Fukui 9108507, Japan
Japan Adv Inst Sci & Technol, Ishikawa 9231292, Japan
RAS, SB, Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Applied Physics, University of Fukui, Fukui 910-8507, Japan
Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan
Institute of Physics, SB RAS, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Yasuda, Y.; Nakamura, H.; Fujii, Y.; Kikuchi, H.; Chiba, M.; Yamamoto, Y.; Hori, H.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Popov, M. A.; Bezmaternykh, L. N.
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Calculation of the energy of binding of titanium and scandium complexes to the surface of carbon nanotubes / A. A. Kuzubov [et al.] // Russ. J. Phys. Chem. B. - 2009. - Vol. 3, Is. 4. - P. 679-683, DOI 10.1134/S1990793109040289. - 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. . - ISSN 1990-7931

РУБ Physics, Atomic, Molecular & Chemical
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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Держатели документа:
Institute of Natural and Humanitarian Sciences, Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian State Technological University, Krasnoyarsk 660049, Russian Federation

Доп.точки доступа:
Kuzubov, A. A.; Кузубов, Александр Александрович; Krasnov, P. O.; Краснов, Павел Олегович; Kozhevnikov, T. A.; Popov, M. A.; Analytical departmental program "Development of Higher Education Potential" [2.1.1/2584]; Russian Foundation for Basic Research [09-02-00324-a]
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Zobov, V. E.
Dynamics in the systems with the 3-spin coupling induced by the strong radiofrequency field / V. E. Zobov, M. A. POPOV // Zhurnal Eksperimentalnoi Teor. Fiz. - 1993. - Vol. 103, Is. 6. - P. 2129-2141. - Cited References: 24 . - ISSN 0044-4510

РУБ Physics, Multidisciplinary
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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Доп.точки доступа:
POPOV, M. A.; Зобов, Владимир Евгеньевич
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Popov, M. A.
Effect of fluctuations on the NQR spectrum in the incommensurate phase of a Cs2ZnI4 crystal / M. A. Popov, I. P. Aaleksandrova, S. V. Primak // JETP Letters. - 1994. - Vol. 59, Is. 7. - P. 485-487. - Cited References: 5 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary

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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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН

Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Primak, S. V.
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Zobov, V. E.
Excluded volume effects for frequency moments of the spin autocorrelation function of the Heisenberg model on a square lattice at high temperatures / V. E. Zobov, M. A. Popov // J. Stat. Phys. - 1999. - Vol. 97, Is. 3-4. - P. 793-802, DOI 10.1023/A:1004675527713. - Cited References: 17 . - ISSN 0022-4715

РУБ Physics, Mathematical
Рубрики:

Кл.слова (ненормированные):
spin dynamics -- frequency moments -- excluded volume -- singular points
Аннотация: The expansion coefficients in powers of time (or frequency moments) of the spill autocorrelation Function are represented at the simple self-consistent approximation as a sum of weighted trees on a Bethe lattice. Using the computer numeration and the Monte Carlo method for self-avoidingly embedding these trees on the square lattice, we estimate the moments and the convergence radius of the expansion. We show that the moments decrease and the radius increases in consequence of the volume exclusion.

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Держатели документа:
LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
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Popov, M. A.
Gaussian approximation in the ising-model with long-range interaction / M. A. Popov // Theor. Math. Phys. - 1990. - Vol. 83, Is. 3. - P. 658-663, DOI 10.1007/BF01018036. - Cited References: 7 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical

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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Incommensurate magnetic structure in copper metaborate / G. A. Petrakovskii [et al.] // J. Exp. Theor. Phys. - 2001. - Vol. 93, Is. 4. - P. 809-814, DOI 10.1134/1.1420450. - Cited References: 10 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
CUB2O4
Аннотация: Based on the experimental data on copper metaborate single crystals obtained in X-ray and neutron diffraction studies and heat capacity, magnetic susceptibility, and muon spin relaxation measurements, a phenomenological theory of the incommensurate magnetic structure of this crystal was developed. Considering the space group of the crystal, I (4) over bar 2d, Lifshits invariants were included into its thermodynamic potential. An analysis showed that magnetic structure formation at 10-20 K was dominated by the subsystem of copper spins in 4b unit cell sites. Below 10 K, the role played by the magnetic subsystem of copper spins in 8d unit cell sites in the formation of the magnetic structure of copper metaborate substantially increased. This caused a sharp increase in the wave vector of the incommensurate structure as temperature lowered. Numerical simulation of the temperature dependence of the wave vector of the helix and the heat capacity of the crystal gave a satisfactory description of the experimental data. This simulation was used to estimate the parameters of the phenomenological thermodynamic potential of the magnetic system of copper metaborate. (C) 2001 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ETH Zurich, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
Paul Scherrer Inst, CH-5232 Villigen, Switzerland
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
ИФ СО РАН

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Popov, M. A.; Roessli, B.; Ouladdiaf, B.
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Popov, M. A.
Line shape of magnetic resonance in the Anderson approximation with consideration of quadratic fluctuations / M. A. Popov, V. E. Zobov // Fiz. Tverd. Tela. - 1996. - Vol. 38, Is. 10. - P. 3070-3074. - Cited References: 12 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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Держатели документа:
LV KIRENSKII INST PHYS,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН
Доп.точки доступа:
Zobov, V. E.
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10.

Magnetic properties of copper metaborate CuB2O4 / G. A. Petrakovskii [et al.] // Low Temp. Phys. - 2002. - Vol. 28, Is. 8-9. - P. 606-612 ; Физика низких температур, DOI 10.1063/1.1511704. - Cited References: 17 . - ISSN 1063-777X

РУБ Physics, Applied
Рубрики:
SINGLE-CRYSTALS
RESONANCE
STATE
Аннотация: The results of experimental research on the magnetic and resonance properties, heat capacity, muon spin relaxation, and neutron scattering of single-crystal copper metaborate CuB2O4 are reviewed. The results of a symmetry analysis and of modeling by the method of the phenomenological thermodynamic potential are presented. The magnetic structure of the crystal in various temperature intervals of the magnetic ordering region is discussed. (C) 2002 American Institute of Physics.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Paul Scherrer Inst, CH-6232 Villigen, Switzerland
Swiss Fed Inst Technol, Lab Neutron Scattering, CH-6232 Villigen, Switzerland
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, 660036 Krasnoyarsk, Russian Federation
Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institute, CH-6232 Villigen PSI, Switzerland
Institut Laue-Langevin, 38042 Grenoble, Cedex 9, France

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Popov, M. A.; Balaev, A. D.; Балаев, Александр Дмитриевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Sablina, K. A.; Саблина, Клара Александровна; Roessli, B.; Schefer, J.; Amato, A.; Staub, U.; Boehm, M.; Ouladdiaf, B.

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