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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Aleksandrov K. S., Aplesnin S. S., Roessli B., Semadeni F., Amato A., Baines C., Bartolome J., Evangelisti M.
Заглавие : Spin-glass state in CuGa2O4
Место публикации : Phys. Rev. B. - 2001. - Vol. 63, Is. 18. - Ст.184425. - ISSN 0163-1829, DOI 10.1103/PhysRevB.63.184425
Примечания : Cited References: 28
Предметные рубрики: TRANSITION
Ключевые слова (''Своб.индексиров.''): copper--gallium--glass--oxygen--acceleration--article--magnetism--measurement--molecular dynamics--phase transition
Аннотация: Magnetic susceptibility, magnetization, specific-heat, and positive muon spin relaxation (?SR) measurements have been used to characterize the magnetic ground state of the spinel compound CuGa2O4. We observe a spin-glass transition of the S = 1/2 Cu2+ spins below Tf = 2.5 K characterized by a cusp in the susceptibility curve which is suppressed when a magnetic field is applied. We show that the magnetization of CuGa2O4 depends on the magnetic history of the sample. Well below Tf, the muon signal resembles the dynamical Kubo-Toyabe expression reflecting that the spin freezing process in CuGa2O4 results in a Gaussian distribution of the magnetic moments. By means of Monte Carlo simulations, we obtain the relevant exchange integrals between the Cu2+ spins in this compound.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Divin A., Markidis S., Lapenta G., Semenov V. S., Erkaev N. V., Biernat H. K.
Заглавие : Model of electron pressure anisotropy in the electron diffusion region of collisionless magnetic reconnection
Коллективы :
Место публикации : Phys. Plasmas: AMER INST PHYSICS, 2010. - Vol. 17, Is. 12. - Ст.122102. - ISSN 1070-664X, DOI 10.1063/1.3521576
Примечания : Cited References: 42. - The present work is supported partially by the Onderzoekfonds KU Leuven (Research Fund KU Leuven) and by the European Commission's Seventh Framework Programme (FP7/2007-2013) under grant Agreement No. 218816 (SOTERIA project, www.soteria- space.eu). Additional support is provided by RFBR (Grant No. 09-05-91000-ANF-a). V.S.S. thanks ISSI for hospitality and financial support. The simulations were conducted on the resources of the Vlaams Supercomputer Centrum (VSC) at the Katholieke Universiteit Leuven.
Предметные рубрики: CURRENT SHEETS
X-LINE
PLASMA
DISSIPATION
FIELD
SIMULATIONS
ACCELERATION
TRANSPORT
Ключевые слова (''Своб.индексиров.''): analytical results--antiparallel configuration--collisionless--electron diffusion--electron population--electron pressures--magnetic reconnections--neutral line--new model--particle-in-cell simulations--two particles--anisotropy--astrophysics--collisionless plasmas--computer simulation--diffusion--geophysics--magnetic fields--magnetic properties--plasma simulation--electrons
Аннотация: A new model of the electron pressure anisotropy in the electron diffusion region in collisionless magnetic reconnection is presented for the case of antiparallel configuration of magnetic fields. The plasma anisotropy is investigated as source of collisionless dissipation. By separating electrons in the vicinity of the neutral line into two broad classes of inflowing and accelerating populations, it is possible to derive a simple closure for the off-diagonal electron pressure component. The appearance of these two electron populations near the neutral line is responsible for the anisotropy and collisionless dissipation in the magnetic reconnection. Particle-in-cell simulations verify the proposed model, confirming first the presence of two particle populations and second the analytical results for the off-diagonal electron pressure component. Furthermore, test-particle calculations are performed to compare our approach with the model of electron pressure anisotropy in the inner electron diffusion region by Fujimoto and Sydora [Phys. Plasmas 16, 112309 (2009)]. (C) 2010 American Institute of Physics. [doi:10.1063/1.3521576]
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Two-dimensional quantum spin liquid with S=1/2 spins interacting with acoustic phonons
Разночтения заглавия :авие SCOPUS: Two-dimensional quantum spin liquid with S = 1/2 spins interacting with acoustic phonons
Место публикации : Phys. Lett. A. - 2004. - Vol. 333, Is. 5-6. - P.446-449. - ISSN 0375-9601, DOI 10.1016/j.physleta.2004.10.064
Примечания : Cited References: 11
Предметные рубрики: ANTIFERROMAGNET
Ключевые слова (''Своб.индексиров.''): spin-phonon interactions--spin-liquid--spinon excitations--spin-liquid--spin-phonon interactions--spinon excitations--ferromagnetic material--acceleration--acoustics--article--density--energy--liquid--magnetic field--mathematical analysis--monte carlo method--phonon--quantum mechanics
Аннотация: The spin density of states of a two-dimensional antiferromagnet in magnetic field having spins-1/2 and interacting with acoustic phonons is investigated in the nonadiabatic approximation using the quantum Monte Carlo method. It is found the gap energy A in the single particle spin excitations spectrum closes at magnetic field Delta similar or equal to H-c, W-ph W-s and Delta similar or equal to (1/2)H-c, W-ph W-s, where W-ph and W-s are the bandwidths of phonon and spin excitations in antiferromagnet. (C) 2004 Elsevier B.V All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Vas'kovskii V. O., Velikanov D. A., Svalov A. V., Panova M. A.
Заглавие : Spin-glass-like behavior of low field magnetisation in multilayer (Gd/Si/Co/Si)(n) films
Разночтения заглавия :авие SCOPUS: Spin-glass-like behavior of low field magnetisation in multilayer (Gd/Si/Co/Si)n films
Место публикации : Phys. Lett. A. - 2003. - Vol. 309, Is. 1-2. - P.155-159. - ISSN 0375-9601, DOI 10.1016/S0375-9601(03)00169-5
Примечания : Cited References: 13
Предметные рубрики: BIQUADRATIC EXCHANGE
Ключевые слова (''Своб.индексиров.''): cobalt--gadolinium--glass--silicon--silicon derivative--acceleration--article--film--magnetic field--magnetism--molecular dynamics--molecular interaction
Аннотация: The results of experimental investigations of magnetic properties of multilayer (Gd/Si/Co/Si)(n) films in low magnetic fields are represented. The spin-glass-like behavior of magnetization is found. The role of biquadratic exchange coupling in a forming of magnetic state of system is discussed. (C) 2003 Elsevier Science B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : SHAPIRO V. E.
Заглавие : ACCELERATION EFFECT DUE TO THERMAL FLUCTUATIONS
Место публикации : Phys. Lett. A: ELSEVIER SCIENCE BV, 1984. - Vol. 102, Is. 4. - P167-170. - ISSN 0375-9601, DOI 10.1016/0375-9601(84)90933-2
Примечания : Cited References: 9
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : SHAPIRO V. E.
Заглавие : ACCELERATION EFFECT DUE TO SCATTERING ON THERMAL EXCITATIONS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1985. - Vol. 27, Is. 6. - P1846-1851. - ISSN 0367-3294
Примечания : Cited References: 19
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wang X., Li J. -G., Molokeev M. S., Wang X., Liu W., Zhu Q., Tanaka H., Suzuta K., Kim B. -N., Sakka Y.
Заглавие : Hydrothermal crystallization of a Ln2(OH)4SO4·nH2O layered compound for a wide range of Ln (Ln = La-Dy), thermolysis, and facile transformation into oxysulfate and oxysulfide phosphors
Место публикации : RSC Adv.: Royal Society of Chemistry, 2017. - Vol. 7, Is. 22. - P.13331-13339. - ISSN 20462069 (ISSN), DOI 10.1039/c7ra00645d
Примечания : Cited References: 54. - This work was partly supported by the National Natural Science Foundation of China (Grants No. 51672039, 51172038, and 51302032), the Fundamental Research Fund for the Central Universities (Grant No. N140204002), the Grants-in-Aid for Scientific Research (KAKENHI No. 26420686), and the Russian Foundation for Basic Research (15-52-53080). Xuejiao Wang acknowledges the financial support received from the China Scholarship Council for her overseas Ph. D. study at the National Institute of Materials Science (Contract No. 201406080035).
Ключевые слова (''Своб.индексиров.''): dysprosium--hydrothermal synthesis--light emission--phase structure--phosphors--rare earth elements--acceleration voltages--chemical compositions--electron beam irradiation--hydrothermal conditions--hydrothermal crystallization--lanthanide contraction--photoluminescence properties--structure refinements--dysprosium compounds
Аннотация: The synthesis of a layered Ln2(OH)4SO4·nH2O material (Ln-241) with a smaller lanthanide ion (Dy3+) was successfully achieved through the optimization of the hydrothermal conditions, and the effect of lanthanide contraction on the chemical composition, phase structure, and crystallite/particle morphology of the products was investigated and discussed. Structure refinement showed that the lattice parameters (a, b, and c), cell volume, and axis angle across the series (Ln = La-Dy) monotonously decrease as the size of Ln3+ decreases. Comparative TG/DTA analysis in air indicated that the dehydroxylation temperature of Ln-241 tends to increase, whereas the dehydration and desulfurization temperatures decrease as the size of Ln3+ decreases, thus narrowing the stable temperature range for Ln2O2SO4. Taking advantage of the fact that Ln-241 has exactly the same Ln/S molar ratio as Ln2O2SO4 and Ln2O2S, the latter two groups of important compounds (excluding Ce) were facilely transformed from the former via the removal of water by calcination. The photoluminescence properties of Eu3+ and Tb3+, in terms of excitation, emission, fluorescence decay, quantum yield, and emission color, were investigated and compared for the two hosts Gd2O2S and Gd2O2SO4, and the (Gd0.99Tb0.01)2O2S phosphor was shown to be stable under electron beam irradiation in the studied range and exhibited an increasingly higher emission brightness as the acceleration voltage (up to 7 kV) or beam current (up to 50 μA) increased.
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