Библиотека института физики им. Л.В. Киренского СО РАН

Главная

Базы данных

Труды сотрудников ИФ СО РАН - результаты поиска

Вид поиска

Каталог книг и брошюр библиотеки ИФ СО РАН

Каталог журналов библиотеки ИФ СО РАН

Труды сотрудников ИФ СО РАН

Область поиска

в найденном

Формат представления найденных документов:
полный	информационный	краткий

Отсортировать найденные документы по:
автору	заглавию	году издания	типу документа

Поисковый запрос: (<.>K=article<.>)

Общее количество найденных документов : 26
Показаны документы с 1 по 20

1-20 21-26

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vtyurin A. N., Bulou A., Krylov A. S., Shmygol I. V., Aleksandrov K. S.
Заглавие : Raman scattering study of the upper phase transition in CsScF4
Место публикации : Journal of Raman Spectroscopy. - 2000. - Vol. 31, Is. 3. - P.151-155. - ISSN 0377-0486, DOI 10.1002/(SICI)1097-4555(200003)31:3151::AID-JRS5103.0.CO;2-T
Ключевые слова (''Своб.индексиров.''): article--crystal--heating--high temperature--melting point--neutron scattering--phase transition--photon--raman spectrometry--temperature dependence
Аннотация: Effects of the phase transition between the high-temperature tetragonal phases of the CsScF4 crystal were studied by Raman scattering. The appearance of new lines including a soft mode was observed below the phase transition point, in complete accordance with the new crystal symmetry. The behavior of the soft mode, which corresponds to in-phase rotations of ScF6 rigid groups around the z-axis (and out-of-phase within perovskite-like layers), resembles that observed earlier in RbAlF4, which suggests a similar mechanism of this transition in both crystals. Copyright (C) 2000 John Wiley and Sons, Ltd.
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gluck M., Kolovsky A. R., Korsch H. J.
Заглавие : A quantum cable car for Wannier-Stark ladders
Место публикации : Phys. Lett. A. - 2000. - Vol. 276, Is. 1-4. - P.167-174. - ISSN 0375-9601, DOI 10.1016/S0375-9601(00)00656-3
Примечания : Cited References: 13
Предметные рубрики: DYNAMIC LOCALIZATION
BLOCH PARTICLE
AC FIELDS
DC
STATES
STATISTICS
LIFETIME
Ключевые слова (''Своб.индексиров.''): wannier-stark ladder--induced transitions--induced transitions--wannier-stark ladder--article--energy--oscillation--quantum mechanics--time--transport kinetics
Аннотация: This Letter studies the dynamics of transitions between the levels of a Wannier-Stark ladder induced by a resonant periodic driving. The analysis of the problem is done in terms of resonance quasienergy states, which take into account the metastable character of the Wannier-Stark states. It is shown that the periodic driving creates from a localized Wannier-Stark state an extended Bloch-like state with a spatial length varying in time as similar to t(1/2). Such a state can find applications in the field of atomic optics because it generates a coherent pulsed atomic beam. (C) 2000 Elsevier Science B.V. All rights reserved.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

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.
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Peng J. L., Bulcock S., Belobrov P. I., Bursill L. A.
Заглавие : Surface bonding states of nano-crystalline diamond balls
Место публикации : Int. J. Mod. Phys. B: WORLD SCIENTIFIC PUBL CO PTE LTD, 2001. - Vol. 15, Is. 31. - P4071-4085. - ISSN 0217-9792, DOI 10.1142/S0217979201007865
Примечания : Cited References: 20
Предметные рубрики: PLASMON RESPONSE
POWDER
SPECTROSCOPY
MICROSCOPY
SILICON
SI(111)
Ключевые слова (''Своб.индексиров.''): diamond--article--crystal structure--electron--energy transfer--nanoparticle--particulate matter--structure analysis--surface property--transmission electron microscopy
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-pi* transitions, although typically the latter occupy a range of only 4 eV for the sp(2) edge of highly-oriented pyrollytic graphite (HOPG). No pi* electrons appear in the conduction band inside the diamond particles, where all electrons are sp(3) hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp(2) and sp(3) states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp(2)/sp(3) ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.
WOS,
Scopus
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mendez-Bermudez J. A., Luna-Acosta G. A., Seba P., Pichugin K. N.
Заглавие : Understanding quantum scattering properties in terms of purely classical dynamics: Two-dimensional open chaotic billiards
Место публикации : Phys. Rev. E: AMER PHYSICAL SOC, 2002. - Vol. 66, Is. 4. - Ст.46207. - ISSN 1539-3755, DOI 10.1103/PhysRevE.66.046207
Примечания : Cited References: 34
Предметные рубрики: BALLISTIC-TRANSPORT
POINCARE SECTIONS
CAVITIES
EIGENFUNCTIONS
LOCALIZATION
CHANNEL
Ключевые слова (''Своб.индексиров.''): chaos theory--electron tunneling--laser applications--nonlinear systems--probability--waveguide components--chaotic motion--microlasers--quantum scattering--scattering probability--quantum theory--article
Аннотация: We study classical and quantum scattering properties of particles in the ballistic regime in two-dimensional chaotic billiards that are models of electron- or micro-waveguides. To this end we construct the purely classical counterparts of the scattering probability (SP) matrix \S(n,m)\(2) and Husimi distributions specializing to the case of mixed chaotic motion (incomplete horseshoe). Comparison between classical and quantum quantities allows us to discover the purely classical dynamical origin of certain general as well as particular features that appear in the quantum description of the system. On the other hand, at certain values of energy the tunneling of the wave function into classically forbidden regions produces striking differences between the classical and quantum quantities. A potential application of this phenomenon in the field of microlasers is discussed briefly. We also see the manifestation of whispering gallery orbits as a self-similar structure in the transmission part of the classical SP matrix.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Alekseev K. N., Kusmartsev F. V.
Заглавие : Pendulum limit, chaos and phase-locking in the dynamics of ac-driven semiconductor superlattices
Место публикации : Phys. Lett. A: ELSEVIER SCIENCE BV, 2002. - Vol. 305, Is. 5. - P281-288. - ISSN 0375-9601, DOI 10.1016/S0375-9601(02)01420-2
Примечания : Cited References: 60
Предметные рубрики: STRANGE NONCHAOTIC ATTRACTORS
DC VOLTAGE GENERATION
JOSEPHSON-JUNCTIONS
GAAS/ALAS SUPERLATTICE
BLOCH OSCILLATIONS
TERAHERTZ RADIATION
ELECTRIC-FIELD
THZ RADIATION
FREQUENCY
TRANSPORT
Ключевые слова (''Своб.индексиров.''): semiconductor superlattice--pendulum--chaos--phase-locking--josephson junction--chaos--josephson junction--pendulum--phase-locking--semiconductor superlattice--analytic method--analytical parameters--article--dynamics--electric potential--semiconductor--temperature
Аннотация: We describe a limiting case when nonlinear dynamics of an ac-driven semiconductor superlattice in the miniband transport regime is governed by a periodically forced and damped pendulum equations. We find analytically the conditions for a transition to chaos. With increasing temperature the chaos disappears. We also discuss fractional do voltage states in a superlattice originating from phase-locked states of the pendulum. (C) 2002 Elsevier Science B.V. All rights reserved.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., de la Cruz F. A.
Заглавие : Magnetic monopoles with generalized quantization condition
Место публикации : Phys. Lett. A. - 2002. - Vol. 302, Is. 5-6. - P.253-260. - ISSN 0375-9601, DOI 10.1016/S0375-9601(02)01172-6
Примечания : Cited References: 33
Предметные рубрики: QUANTUM-MECHANICS
DIRAC MONOPOLE
3-COCYCLE
SPACE
Ключевые слова (''Своб.индексиров.''): monopole--nonunitary representations--nonassociativity--gauge loop--quasigroups--gauge loop--monopole--nonassociativity--nonunitary representations--quasigroups--article--calculation--magnetic field--mathematics--quantum mechanics--rotation--theory
Аннотация: Theory of pointlike magnetic monopole with an arbitrary magnetic charge is considered. It is shown that a proper description requires making use of nonunitary representations of the rotation group and the nonassociative generalization of the gauge group and fibre bundle theory. (C) 2002 Elsevier Science B.V. All rights reserved.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kaminskii A. A., Butashin A. V., Aleksandrov K. S., Bezmaternykh L. N., Temerov V. L., Kravtsov N. V., Firsov V. V., Seo D. T., Hommerich U., Temple D., Braud A.
Заглавие : Gd3Ga5O12:Nd3+ crystals for a continuous-wave diode-pumped laser operating in 4F3/2 4I11/2 and 4F3/2 4I13/2 channels
Место публикации : Crystallogr. Rep. - 2002. - Vol. 47, Is. 2. - P.308-312. - ISSN 1063-7745, DOI 10.1134/1.1466508
Примечания : Cited References: 15
Предметные рубрики: GALLIUM GARNET
EMISSION
Ключевые слова (''Своб.индексиров.''): gadolinium--gallium--neodymium--article--concentration response--crystal--pump--spectroscopy--x ray--x ray topography
Аннотация: Garnet crystals of the composition Gd3Ga5O12:Nd3+ (concentration series CNd = 1-10 at. %) were grown from flux. In terms of spectroscopy, these crystals, unlike those grown from melts, form a medium with a single activator center. For the first time, continuous-wave lasing was excited by diode pumping with the use of Gd3Ga5O12:Nd3+ crystals at the wavelengths ?3 = 1.3315 and ?4 = 1.3370 ?m of the 4F3/2 4I13/2 channel and also the simultaneous generation at two wavelengths, ?1 = 1.0621 and ?2 = 1.0600 ?m, of the 4F3/2 4I11/2 channel. В© 2002 MAIK "Nauka/Interperiodica".
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Influence of spin-phonon coupling on the magnetic moment in 2D spin-1/2 antiferromagnet
Место публикации : Phys. Lett. A. - 2003. - Vol. 313, Is. 1-2. - P.122-125. - ISSN 0375-9601, DOI 10.1016/S0375-9601(03)00689-3
Примечания : Cited References: 17
Предметные рубрики: SQUARE LATTICE
EU2CUO4
MODEL
Ключевые слова (''Своб.индексиров.''): 2d heisenberg model--spin-phonon interactions--2d heisenberg model--spin-phonon interactions--ferromagnetic material--anisotropy--article--liquid--magnetism--mathematical model--monte carlo method--quantum theory--thermal conductivity--vibration
Аннотация: The ground state of two-dimensional Heisenberg spin-1/2 antiferromagnet (AF) with the spin-phonon coupling is studied by the quantum Monte Carlo method. The magnetic moment per site, mean-square vibration of ion, phase diagram of AF long range order-quantum spin. liquid are simulated. The spin-phonon coupling is estimated for R2CuO4, R = Gd, Eu. (C) 2003 Elsevier Science B.V. All rights reserved.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

10.

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.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Markel V. A., Pustovit V. N., Karpov S. V., Obuschenko A. V., Gerasimov V. S., Isaev I. L.
Заглавие : Electromagnetic density of states and absorption of radiation by aggregates of nanospheres with multipole interactions
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2004. - Vol. 70, Is. 5. - Ст.54202. - ISSN 1098-0121, DOI 10.1103/PhysRevB.70.054202
Примечания : Cited References: 81
Предметные рубрики: DISCRETE-DIPOLE APPROXIMATION
ENHANCED RAMAN-SCATTERING
METAL FRACTAL CLUSTERS
OPTICAL-PROPERTIES
SELECTIVE PHOTOMODIFICATION
DISORDERED CLUSTERS
NUMERICAL-SIMULATION
SPECTRAL DEPENDENCE
PARTICULATE MATTER
LIGHT-SCATTERING
Ключевые слова (''Своб.индексиров.''): carbon--iron--palladium--silver--article--dipole--electromagnetic field--geometry--mathematical analysis--molecular interaction--nanoparticle--radiation absorption
Аннотация: We calculate the quasistatic electromagnetic density of states for aggregates of touching spheres, in particular, linear chains and computer-generated random fractal aggregates. Multipole moments with orders of up to L=64 are taken into account for random aggregates with the number of particles of up to N=100 and up to L=8000 for linear chains. Extensive comparisons with the dipole approximation and geometrical cluster renormalization method are performed. Extinction spectra are calculated for several metals and black carbon. Long wavelength electromagnetic properties of fractal aggregates are considered in details.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chukalina E. P., Kuritsin D. Y., Popova M. N., Bezmaternykh L. N., Kharlamova S. A., Temerov V. L.
Заглавие : Magnetic ordering of NdFe3(BO3)(4) studied by infrared absorption spectroscopy
Разночтения заглавия :авие SCOPUS: Magnetic ordering of NdFe3(BO3)4 studied by infrared absorption spectroscopy
Место публикации : Phys. Lett. A. - 2004. - Vol. 322, Is. 3-4. - P.239-243. - ISSN 0375-9601, DOI 10.1016/j.physleta.2003.12.062
Примечания : Cited References: 8
Предметные рубрики: CRYSTALS
Ключевые слова (''Своб.индексиров.''): ferroborates--fourier-transform spectroscopy--magnetic ordering--ferroborates--fourier-transform spectroscopy--magnetic ordering--iron--neodymium--absorption spectroscopy--article--electronics--infrared spectroscopy--magnetism--molecular interaction--molecular physics--temperature
Аннотация: We report the first measurements of the optical spectra of NdFe3(BO3)(4), a promising material for optoelectronics. Exchange splitting of Nd3+ spectral lines due to magnetic interactions in a magnetically ordered state was observed. The temperature dependences of the exchange splitting and of the linewidth point to the temperature T-c 33 +/- 1K of the magnetic ordering in both iron and neodymium. magnetic subsystems. 2004 Elsevier B.V. All rights reserved.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivchenko E. L., Voronov M. M., Erementchouk M. V., Deych L. I., Lisyansky A. A.
Заглавие : Multiple-quantum-well-based photonic crystals with simple and compound elementary supercells
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2004. - Vol. 70, Is. 19. - Ст.195106. - ISSN 1098-0121, DOI 10.1103/PhysRevB.70.195106
Примечания : Cited References: 33
Предметные рубрики: EXCITON POLARITONS
DIELECTRIC MEDIUM
OPTICAL LATTICES
BRAGG STRUCTURES
BAND-STRUCTURES
PERIODIC-BRAGG
REFLECTION
ABSORPTION
SPECTRA
ARRAYS
Ключевые слова (''Своб.индексиров.''): article--crystal--crystal structure--elementary particle--light scattering--mathematical analysis
Аннотация: Exciton polaritons in one-dimensional photonic crystals based on multiple quantum well structures are investigated. The effects due to interplay between resonant interaction of light with quantum well excitons, and light scattering from well-barrier interface, are elucidated. Polariton dispersion equations and reflection spectra in structures with two wells in an elementary supercell of the periodic structure are studied. Several examples of different compound elementary supercells are considered. Special attention is paid to structures with the period or the distance between quantum wells satisfying the resonance Bragg condition. Such structures are characterized by a presence of a larger-than-usual polariton stop band. It is shown that in structures with a complex elementary supercell, the width of such a stop band can be significantly enhanced in comparison to that in simple structures.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

14.

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.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Men'shikov V. V., Ovchinnikov S. G., Rudenko V. V., Sudakov A. N., Tugarinov V. I., Vorotynov A. M.
Заглавие : Magnetic anisotropy quantitative estimation for the rhombohedral antiferromagnetic crystals containing S-state ions - art. no. 224405 (Retracted Article. see vol 72, art. no. 189901, 2005)
Разночтения заглавия :авие SCOPUS: Magnetic anisotropy quantitative estimation for the rhombohedral antiferromagnetic crystals containing S-state ions
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2005. - Vol. 71, Is. 22. - Ст.224405. - ISSN 1098-0121, DOI 10.1103/PhysRevB.71.224405
Примечания : Cited References: 33
Предметные рубрики: ELECTRON-PARAMAGNETIC-RES
EXCHANGE-COUPLED PAIRS
RESONANCE MEASUREMENTS
GARNETS
MN-2
Аннотация: The method to investigate "single-ion" exchange anisotropy (as predicted by the pair model) is treated by exploration of several isostructural diamagnetic crystals containing magnetic impurities. The electron paramagnetic resonance (EPR) spectra were observed for ferric borate isostructural crystals MBO(3): Fe(3+) (M = Ga, In, Lu, Sc). The experimental dependences of the spin-Hamiltonian axial parameters of the second-order D(S) and fourth-order (a-F)(cS) versus total pair spin S are presented. The contributions arising from the distortion of the parent crystal lattice MBO3 under magnetic dilution are estimated. The microscopic derived expressions for the "single-ion" contribution to the anisotropy are also presented. The present experimental data enable estimation of the "single- ion" exchange contribution for FeBO(3), MnCO(3), and alpha-Fe(2)O(3) crystals at T= 0 K. The quantitative estimations for EPR are in satisfactory agreement among themselves and with the experimental data.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasilyeva I. G., Dovlitova L. S., Zaikovskii V. I., Malakhov V. V., Edel'man I. S., Stepanov A. S., Aleksandrov K. S.
Заглавие : Actual composition and structure of manganese ferrite nanoparticles dispersed in the borate glass matrix
Место публикации : Doklady Chemistry. - 2005. - Vol. 401, Is. 1-3. - P.47-50. - ISSN 0012-5008, DOI 10.1007/s10631-005-0029-y
Ключевые слова (''Своб.индексиров.''): boric acid--ferrite--glass--manganese derivative--analytic method--article--chemical composition--chemical structure--nanoparticle--stoichiometry--structure analysis--transmission electron microscopy--x ray analysis
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kliava J., Malakhovskii A. V., Edelman I. S., Potseluyko A. M., Petrakovskaja E. A., Melnikova S.V., Zarubina T. V., Petrovskii G., Bruckental Y., Yeshurun Y.
Заглавие : Unusual magnetic transitions and nature of magnetic resonance spectra in oxide glasses containing gadolinium
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2005. - Vol. 71, Is. 10. - Ст.104406. - ISSN 1098-0121, DOI 10.1103/PhysRevB.71.104406
Примечания : Cited References: 40
Предметные рубрики: ELECTRON-PARAMAGNETIC-RESONANCE
BORATE GLASSES
IONS
BEHAVIOR
GD3+
SPECTROSCOPY
SYSTEMS
GD-3+
FIELD
SHAPE
Ключевые слова (''Своб.индексиров.''): gadolinium--glass--lanthanide--oxide--anisotropy--article--chemical structure--concentration response--electron spin resonance--energy--magnetism--molecular physics--nanoparticle--phase transition--refraction index--temperature sensitivity
Аннотация: Magnetic susceptibility, electron paramagnetic resonance (EPR), and optical properties have been studied in a glass system {20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2+GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in the more heavily doped glasses and ascribed to clustering of Gd3+ ions. Two magnetic phase transitions at 55 and 12 K were detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters containing Gd ions. The overall shape of the EPR spectra shows the presence of clustering at the higher Gd contents. At low temperatures the cluster-related resonance signal is altered in shape, indicating an onset of magnetic anisotropy field. This signal is convincingly fitted to superparamagnetic resonance arising from ferromagnetic nanoparticles. The clustering, depending on the Gd concentration, correlates with a significant shift to lower energies of the strong optical absorption band edge, ascribed to a charge transfer transition between Gd ions. A nonmonotonous change of refractive index with the increase of the Gd content indicates changes in the glass matrix and in Gd cluster structure.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Felk V. A.
Заглавие : Exchange narrowing of magnetic resonance linewidths in inhomogeneous ferromagnets
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2005. - Vol. 71, Is. 9. - Ст.94417. - ISSN 1098-0121, DOI 10.1103/PhysRevB.71.094417
Примечания : Cited References: 32
Предметные рубрики: AMORPHOUS FERROMAGNETS
RANDOM ANISOTROPY
NANOCRYSTALLINE
CRYSTALS
ALLOYS
Ключевые слова (''Своб.индексиров.''): ferromagnetic material--anisotropy--article--calculation--correlation analysis--crystal structure--magnetism--mathematical analysis--nanotechnology--nuclear magnetic resonance
Аннотация: The theory of exchange narrowing of ferromagnetic and spin-wave resonance linewidths in ferromagnets with the randomly inhomogeneous magnetic anisotropy is developed. The calculation is carried out by the method of averaged Green functions in the framework of the coherent potential approximation (CPA). One- and three-dimensional inhomogeneities with an arbitrary correlation wave number k(c) are considered (r(c)=k(c)(-1) is the correlation radius of the inhomogeneities). The method of the approximate solution of the CPA equation is proposed which has the quick convergence. Effects of exchange narrowing of the magnetic resonance lines and shifts of these lines are calculated in the whole region of the values of the correlation wave number k(c). The approximate analytical expressions for the linewidth of the FMR in the limiting cases of the small and large k(c) are obtained. Large narrowing of the FMR and spin-wave linewidths with the decrease of the correlation, radius of inhomogeneities is the substantiation. of the main advantage of nanocrystalline and amorphous materials over usual polycrystals when they are used at high frequency devices.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Ryabinkina L. I., Abramova G. M., Romanova O. B., Vorotynov A. M., Velikanov D. A., Kiselev N. I., Balaev A. D.
Заглавие : Conductivity, weak ferromagnetism, and charge instability in an alpha-MnS single crystal
Разночтения заглавия :авие SCOPUS: Conductivity, weak ferromagnetism, and charge instability in an α-MnS single crystal; авие SCOPUS: Conductivity, weak ferromagnetism, and charge instability in an ?-MnS single crystal
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2005. - Vol. 71, Is. 12. - Ст.125204. - ISSN 1098-0121, DOI 10.1103/PhysRevB.71.125204; Phys. Rev. B Condens. Matter Mater. Phys. - 2005. - Vol. 71, Is. 12. - Ст.125204. - Вариант Sopus
Примечания : Cited References: 11
Предметные рубрики: MANGANITES
Ключевые слова (''Своб.индексиров.''): ferromagnetic material--manganese derivative--absorption spectroscopy--article--calculation--conductance--crystal--electron spin resonance--hybridization--magnetic field--magnetism--measurement--molecular interaction--temperature dependence--temperature measurement--ferromagnetic material--manganese derivative--absorption spectroscopy--article--calculation--conductance--crystal--electron spin resonance--hybridization--magnetic field--magnetism--measurement--molecular interaction--temperature dependence--temperature measurement
Аннотация: The temperature dependence of resistivity, magnetization, and electron-spin resonance of the α-MnS single crystal were measured in temperature range of 5 K T 550 K. Magnetization hysteresis in an applied magnetic field up to 0.7 T at T
WOS,
Scopus,
Scopus,
Читать в сети ИФ
Найти похожие

20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sorokin P. B., Ovchinnikov S. G., Avramov P. V., Chernozatonskii L.A., Fedorov D.G.
Заглавие : Atypical quantum confinement effect in silicon nanowires
Место публикации : J. Phys. Chem. A. - WASHINGTON: AMER CHEMICAL SOC, 2008. - Vol. 112, Is. 40. - С. 9955-9964. - OCT 9. - ISSN 1089-5639, DOI 10.1021/jp805069b
Примечания : Cited Reference Count: 25. - Гранты: This work was in part partially supported by a CREST (Core Research for Evolutional Science and Technology) grant in the Area of High Performance Computing for Multiscale and Multiphysics Phenomena from the Japan Science and Technology Agency (JST) as well as by Russian Fund of Basic Researches (grant 08-02-01096) (L.A.C.). P.V.A. acknowledges the encouragement of Dr. Keiji Morokuma, Research Leader at Fukui Institute for Fundamental Chemistry. The geometry of all presented structures was visualized by ChemCraft software.SUP25/SUP L.A.C. acknowledges I. V. Stankevich for help and fruitful discussions. P.B.S. is grateful to the Joint Supercomputer Center of the Russian Academy of Sciences for access to a cluster computer for quantum-chemical calculations.Финансирующая организация: Japan Science and Technology Agency (JST); Russian Fund of Basic Researches [08-02-01096]
Предметные рубрики: ELECTRONIC-STRUCTURE
OPTICAL-PROPERTIES
SI
DENSITY
WIRES
EXCHANGE
ATOMS
DOTS
Ключевые слова (''Своб.индексиров.''): electric wire--energy gap--gallium alloys--mathematical models--nanostructured materials--nanostructures--nanowires--quantum confinement--quantum electronics--semiconductor quantum dots--silicon--ami methods--band gaps--blue shifts--dinger equations--linear junctions--monotonic decreases--quantum confinement effects--quantum dots--semiempirical--silicon nanowires--system sizes--theoretical models--nanocrystalline silicon--nanowire--quantum dot--silicon--article--chemistry--electron--quantum theory--electrons--nanowires--quantum dots--quantum theory--silicon
Аннотация: The quantum confinement effect (QCE) of linear junctions of silicon icosahedral quantum dots (IQD) and pentagonal nanowires (PNW) was studied using DFT and semiempirical AM1 methods. The formation of complex IQD/PNW structures leads to the localization of the HOMO and LUMO on different parts of the system and to a pronounced blue shift of the band gap; the typical QCE with a monotonic decrease of the band gap upon the system size breaks down. A simple one-electron one-dimensional Schrodinger equation model is proposed for the description and explanation of the unconventional quantum confinement behavior of silicon IQD/PNW systems. On the basis of the theoretical models, the experimentally discovered deviations from the typical QCE for nanocrystalline silicon are explained.
WOS,
Scopus,
eLibrary
Найти похожие