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Thermal conductivity and magnetic phase diagram of CuB2O4 / T. Kawamata [et al.] // J. Phys. Soc. Jpn. - 2019. - Vol. 88, Is. 11. - Ст. 114708, DOI 10.7566/JPSJ.88.114708. - 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. . - ISSN 0031-9015. - ISSN 1347-4073
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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Держатели документа:
Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan
Department of Engineering and Applied Sciences, Sophia University, Chiyoda, Tokyo 102-8554, Japan
Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan
Department of Applied Physics, Faculty of Engineering, University of Fukui, Fukui 910-8507, Japan
Institute of Physics, Siberian Branch of the Russian Academy of Science, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Kawamata, T.; Sugawara, N.; Haidar, S. M.; Adachi, T.; Noji, T.; Kudo, K.; Kobayashi, N.; Fujii, Yu.; Kikuchi, H.; Chiba, M.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Popov, M. A.; Попов, Михаил Александрович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Koike, Yo.
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Mode splitting in 37-42 GHz barium hexaferrite resonator: Theory and device applications / M. A. Popov [et al.] // IEEE Trans. Magn. - 2014. - Vol. 50, Is. 6. - Ст. 4004507, DOI 10.1109/TMAG.2014.2298498. - Cited References: 34 . - ISSN 0018-9464. - ISSN 1941-0069

РУБ Engineering, Electrical & Electronic + Physics, Applied
Рубрики:
MILLIMETER-WAVE APPLICATIONS
   GUIDE JUNCTION CIRCULATORS
   FERRITE
   MICROWAVE
   PROPAGATION
   CYLINDERS
Кл.слова (ненормированные):
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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Держатели документа:
Taras Shevchenko Natl Univ Kyiv, Radiophys Dept, UA-01601 Kiev, Ukraine
Oakland Univ, Dept Phys, Rochester, MI 48309 USA
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Popov, M. A.; Zavislyak, I. V.; Movchan, N. N.; Gudim, I. A.; Гудим, Ирина Анатольевна; Srinivasan, G.
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Magnetic resonance in FexMn1-xS single crystals / A. M. Vorotynov [et al.] // J. Appl. Phys. - 2009. - Vol. 106, Is. 7. - Ст. 73909, DOI 10.1063/1.3234402. - Cited References: 11. - This study was supported by the SB RAS-INTAS (Grant No. 06-1000013-9002) and the JSPS KAKENHI (Grant No. 18540317). . - ISSN 0021-8979

РУБ Physics, Applied

Кл.слова (ненормированные):
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 <=x <=0.29) are presented. The resonance properties of the concentrated solid solutions are explained by the formation of a homogeneous FexMn1-xS matrix with randomly distributed superparamagnetic iron nanoparticles. The mean diameter (< D > = 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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Держатели документа:
Bovina, A. F.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Sokolov, V. V.] Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia
[Mita, E.] Osaka Univ, Toyonaka, Osaka 5608531, Japan
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Russian Academy of Sciences, Siberian Branch, Novosibirsk, 630090, Russian Federation
Osaka University, Toyonaka 560-8531, Japan

Доп.точки доступа:
Vorotynov, A. M.; Воротынов, Александр Михайлович; Abramova, G. M.; Абрамова, Галина Михайловна; Popov, M. A.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bovina, A. F.; Бовина, Ася Федоровна; Sokolov, V. V.; Mita, E.; SB RAS-INTAS [06-1000013-9002]; JSPS KAKENHI [18540317]
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Magnetic properties of Pb2Fe2Ge2O9 single crystals / G. A. Petrakovskii [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 9. - P. 1853-1858, DOI 10.1134/S1063783409090145. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
[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.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Petrakovskii, G. A.
Popov, M. A.
Bayukov, O. A.
Vasil'ev, A. D.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Boehm, M.] Inst Laue Langevin, F-38042 Grenoble 9, France
ИФ СО РАН

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Popov, M. A.; Balaev, A. D.; Балаев, Александр Дмитриевич; Sablina, K. A.; Саблина, Клара Александровна; Bayukov, O. A.; Баюков, Олег Артемьевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Bovina, A. F.; Бовина, Ася Федоровна; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Boehm, M.
}
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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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Popov, M. A.
On the magnetic phase diagram of copper metaborate / M. A. Popov, G. A. Petrakovskii, O. A. Bolsunovskaya // Phys. Solid State. - 2008. - Vol. 50, Is. 5. - P. 909-912, DOI 10.1134/S106378340805017X. - Cited References: 6 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
[Popov, M. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Petrakovskii, G. A.
Bolsunovskaya, O. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Bolsunovskaya, O. A.
}
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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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Magnetic structure and magnetic excitations in the two-dimensional spin system of the Cu3B2O6 compound / G. A. Petrakovskii [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 7. - P. 1315-1320, DOI 10.1134/S1063783407070207. - Cited References: 21 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
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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Держатели документа:
LV Kirenskii Inst Phys, Siberian Div, Russian Acad Sci, Krasnoyarsk 660036, Russia
Paul Scherrer Inst, Villigen, Switzerland
Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Paul-Scherrer Institute, Villigen, Switzerland
Institute of Physics, Polish Academy of Sciences, Warsaw 02-668, Poland

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Popov, M. A.; Schefer, J.; Neidermayer, C.; Aleshkevich, P.; Szymczak, R.
}
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NMR study of the successive phase transitions in CuB2O4 / H. Nakamura [et al.] // Prog. Theor. Phys. Suppl. - 2005. - Is. 159. - P. 360-364. - Cited References: 8 . - ISSN 0375-9687

РУБ Physics, Multidisciplinary
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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Доп.точки доступа:
Nakamura, H.; Fujii, Y.; Kikuchi, H.; Chiba, M.; Yamamoto, Y.; Hori, H.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Popov, M. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; International Symposium on Quantum Spin Systems(2004 ; Nov. 30 - Dec. 03 ; Hayama, Japan)
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10.

Zobov, V. E.
Tree growth parameter in the Eden model on face-centered hypercubic lattices / V. E. Zobov, M. A. Popov // Theor. Math. Phys. - 2005. - Vol. 144, Is. 3. - P. 1361-1371, DOI 10.1007/s11232-005-0165-z. - Cited References: 19 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
BRANCHED POLYMERS
   HIGH-TEMPERATURES
   EXPANSION
   CLUSTERS
   SYSTEMS
   TIME
Кл.слова (ненормированные):
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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Держатели документа:
RAS, Siberian Branch, Kirenskii Inst Phys, Novosibirsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, RAS, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Popov, M. A.; Зобов, Владимир Евгеньевич
}
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