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1.
The electron spin resonance (ESR) spectra of undoped and manganese-doped BSCCO (2212) crystals (nominal composition Bi2Sr2CaCu2–x
MnxOy, where x=0.1) are compared.
Zh. Tekh. Fiz. 67, 137–138 (October 1997) 相似文献
2.
Optical-resonance-Raman scattering by acoustic phonons is used to study the effect of an electric field on the state of excitons
in GaAs/AlAs superlattices. When the energy of the exciting photon coincides with the energy of an exciton bound to Wannier-Stark
states of a heavy hole and electron with Δn=0,±1, the acoustic Raman scattering is enhanced. Oscillations in the intensity of the Raman spectrum in the electric field
are explained by resonance delocalization of the exciton ground state as it interacts with Wannier-Stark states of neighboring
quantum wells or with Wannier-Stark states of a higher electron miniband.
Fiz. Tverd. Tela (St. Petersburg) 40, 827–829 (May 1998) 相似文献
3.
V. A. Margulis 《Journal of Experimental and Theoretical Physics》1997,84(3):603-611
The coefficient of absorption of electromagnetic radiation by a quasi-two-dimensional electron gas placed in an oblique magnetic
field is found. The scattering of electrons by optical phonons is shown to lead to resonant absorption. The shape of the resonance
peaks on the absorption curve is studied, and their doublet nature is demonstrated. Finally, the dependence of the resonance
peaks on the angle between the magnetic field vector and the confinement plane is investigated.
Zh. éksp. Teor. Fiz. 111, 1092–1106 (March 1997) 相似文献
4.
S. V. Iordanskii 《JETP Letters》1997,66(6):459-462
The skyrmionic mass is calculated using a gradient expansion method. A special cyclotron resonance is predicted, with a frequency
determined by the exchange energy. The possibility of an extra bound electron is discussed.
Pis’ma Zh. éksp. Teor. Fiz. 66, No. 6, 428–431 (25 September 1997)
Published in English in the original Russian journal. Edited by Steve Torstveit. 462 462 相似文献
5.
Yu. K. Zemtsov A. Yu. Sechin A. N. Starostin A. G. Leonov D. I. Chekhov 《JETP Letters》1997,65(11):839-844
The purely thermal infrared emission spectra of a resonance medium (sodium vapor) are investigated experimentally. It is shown
that the emission intensity in the 2–3 μm range at temperatures of 600–1200 K is several orders of magnitude higher than the
intensity obtained from the standard theory of resonance radiation transfer. This phenomenon can be conventionally termed
an “infrared catastrophe.” The form of the recorded spectra and the absolute intensity of the emission in both the infrared
and visible regions of the spectrum are in agreement with the theory developed by Yu. L. Zemtsov and A. M. Starostin, Zh.
éksp. Teor. Fiz. 103, 345 (1993) [JETP 76, 186 (1993)], in which the Boltzmann spectral distribution of the population of the resonance level is proportional to exp(−ħω/T).
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 11, 807–811 (10 June 1997) 相似文献
6.
Yu. B. Vasil’ev S. D. Suchalkin S. V. Ivanov P. S. Kop’ev B. Ya. Mel’tser K. von Klitzing 《JETP Letters》1999,69(4):343-347
Splitting of the cyclotron resonance (CR) line is observed in the electron CR spectra of InAs/GaSb heterostructures containing
tunneling-coupled electron and hole layers. This splitting is interpreted to be a manifestation of a hybridization gap arising
as a result of anticrossing of the Landau levels of electrons and holes when their wave functions overlap. The energy splitting
of the CR lines is correlated with the magnitude of the overlap and agrees with theoretical estimates of the hybridization
gap width.
Pis’ma Zh. éksp. Teor. Fiz. 69, No. 4, 313–317 (25 February 1999) 相似文献
7.
V. V. Vecheslavov 《Journal of Experimental and Theoretical Physics》1999,89(1):182-187
This report is a continuation of an analysis, initiated elsewhere V.V. Vecheslavov and B. V. Chirikov, Zh. éksp. Teor. Fiz.
114, 1516 (1998) [JETP 86, 823 (1998)], of the effect of splitting of the separatrix of a nonlinear resonance for the model of standard mapping, based
on results of direct measurements of the splitting angle α(K), where K is the system parameter. Measurements were made in the previously used wide range 0.1≳α≳10−208 (1⩾K⩾0.0004), but with significantly higher relative (better than 1050) and average (∼10−55) accuracy. This procedure made it possible to substantially refine the effects observed in Ref. 1 and construct qualitatively
new empirical dependences providing reliable extrapolation of the data obtained for the angle and the invariant in the intermediate
asymptotic limit K≲10−2 beyond the limits of the investigated region. The results obtained by us can be useful for further development of the theory
of separatrix splitting and formation of the stochastic layer of a nonlinear resonance.
Zh. éksp. Teor. Fiz. 116, 336–346 (July 1999) 相似文献
8.
A stochastic resonance on mixed harmonics is observed experimentally in a monostable magnetic system. The curve of the stochastic
resonance at higher-order harmonics in systems with a weak nonlinearity is calculated.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 10, 788–792 (25 May 1997) 相似文献
9.
L. S. Vlasenko 《Physics of the Solid State》1999,41(5):697-700
Highly sensitive methods for the detection of the electron paramagnetic resonance (EPR) spectra based on the spin-dependent
microwave photoconductivity were applied to investigate the structural defects in irradiated silicon. The parameters of the
EPR spectra of the excited triplet states of radiation defects were determined and several models of the carbon related defects
were supposed.
Fiz. Tverd. Tela (St. Petersburg) 41, 774–777 (May 1999)
Published in English in the original Russian journal. Reproduced here with stylistic changes by the Translation Editor. 相似文献
10.
11.
A. I. Smirnov V. N. Glazkov A. N. Vasil’ev L. I. Leonyuk S. M. Coad D. McK. Paul G. Dhalenne A. Revcolevschi 《JETP Letters》1996,64(4):305-311
Magnetic resonance at frequencies 22–75 GHz is investigated in pure single-crystalline CuGeO3 in the temperature range 1.2–25 K. At temperatures below 4 K the magnetic resonance line splits into four spectral components.
The line close to the ESR of the paramagnetic phase is associated with impurities or defects. The other three lines have the
same intensity in different samples and are apparently characteristic for pure single crystals at low temperature. An antiferromagnetic
resonance with two resonance absorption branches and a spectrum characteristic for an antiferromagnet with easy, average,
and hard anisotropy axes was observed and investigated in the Néel compound Cu0.98Zn0.02GeO3 with diamagnetic dilution of the spin subsystem.
Pis’ma Zh. éksp. Teor. Fiz. 64, No. 4, 277–282 (25 August 1996) 相似文献
12.
The effect of white noise on phase synchronization is studied numerically for a classical model of a spring pendulum with
a multiple ratio of the frequencies of small oscillations (Vitt-Gorelik model). It is shown that in the model investigated
a Fermi resonance regime occurs for a system in a thermostat. A new type of nonlinear dynamics is found — stochastic resonance
between limit cycles.
Pis’ma Zh. éksp. Teor. Fiz. 69, No. 8, 585–589 (25 April 1999) 相似文献
13.
I. F. Mirsaev 《Physics of the Solid State》1998,40(11):1884-1888
The magnetoelastic contribution ΔĈ
(3) to the effective third-order elastic constants Ĉ
(3)
ef
is determined; it describes the additional elastic anharmonicity induced by nonlinear spin-spin and spin-phonon interactions
in ferromagnets. In the vicinity of magnetoacoustic resonance, this anharmonicity can be manifested in three-frequency elastic
wave interactions, producing magnetoacoustic mode-frequency transformation effects. It is shown that these effects are magnified
in resonance as the result of a huge increase (by several orders of magnitude) in the dynamic elastic constants ΔĈ
(3). Quantitative estimates are obtained for yttrium iron garnet.
Fiz. Tverd. Tela (St. Petersburg) 40, 2080–2084 (November 1998) 相似文献
14.
V. V. Vecheslavov 《JETP Letters》1996,63(12):1047-1053
A new effect [V. V. Vecheslavov, Zh. éksp. Teor. Fiz. 109, 2208 (1996) (JETP 82, 1190 (1996)]—the appearance of low-frequency secondary harmonics in the separatrix mapping of a system—is discussed in detail
for the example of a pendulum with a two-frequency perturbation. It is shown that there exist regions of values of the perturbation
parameters where these harmonics make the main contribution to the formation of the chaotic layer of the fundamental resonance.
The results of analytical and numerical determinations of the amplitudes of the secondary harmonics are compared.
Pis’ma Zh. éksp. Teor. Fiz. 63, No. 12, 989–994 (25 June 1996) 相似文献
15.
The possibility of resonance during elastic intravalley scattering in n-type semiconductors is investigated in connection with the crossing (due to anisotropy of the effective mass) of the energy
levels of excited states of a shallow donor as functions of the magnetic field. The hybridization of states of different frequencies
in the vicinity of a crossing is attributed to the emergence of a nonzero dipole moment of the excited impurity atom and,
accordingly, a long-range potential, which creates carrier-transport anomalies. The lower part of the donor spectrum is calculated
as a function of the magnetic field in Si with B∥〈001〉 and in Ge with B∥〈111〉 or B∥〈110〉. A crossing occurs in Ge in the field range 9.9 T<B<16.7 T and in Si in the field range 10.5 T<B<37.7 T. The characteristic longitudinal relaxation time and the transverse conductivity, which are determined by scattering
at excited donors in the presence of the hybridization of states, are calculated.
Zh. éksp. Teor. Fiz. 112, 975–1010 (September 1997) 相似文献
16.
A contribution to electromagnetic power losses, additional to the losses due to eddy currents and exhibiting a resonance frequency
dependence with the main maximum near 1 GHz, has been observed for the ferromagnetic alloy Pd2AuFe in the frequency range 0.9 MHz–10 GHz in the absence of an external constant magnetic field. Investigations performed
in a dc magnetic field show that this effect is a natural ferromagnetic resonance due to intradomain magnetization precession
in the effective magnetic-anisotropy field.
Fiz. Tverd. Tela (St. Petersburg) 40, 1900–1904 (October 1998) 相似文献
17.
A theory is proposed to describe holograms in thin photorefractive crystals and the self-diffraction of two writing laser
beams, one of which is periodically modulated in phase. In linear approximation with respect to the amplitude of the phase
modulation, expressions are derived for the AC component of the intensity of various diffraction orders. Oscillations in the
intensity are observed having a well-defined resonance character connected with excitation of photorefraction waves, and the
frequency position of the resonance peaks is related to the period of the grating by the dispersion law of these oscillations.
The results obtained are in good agreement with available experimental data.
Fiz. Tverd. Tela (St. Petersburg) 40, 1450–1459 (August 1998) 相似文献
18.
V. V. Levdanskii 《Technical Physics》1998,43(3):345-346
The additional force exerted by a gas on an aerosol particle on account of the change in recoil momentum of the gas molecules
on the surface of the particle in a resonance radiation field is analyzed.
Zh. Tekh. Fiz. 68, 88–89 (March 1998) 相似文献
19.
Ch. Kegler N. Büttgen H.-A. Krug von Nidda A. Krimmel L. Svistov B.I. Kochelaev A. Loidl A. Prokofiev W. Aßmus 《The European Physical Journal B - Condensed Matter and Complex Systems》2001,22(3):321-326
EPR and 7Li NMR measurements were performed in the distorted inverse spinel V(LiCu)O4 down to 1.5 K. Anisotropy effects on magnetic resonance spectra due to the Jahn-Teller distortion of the oxygen octahedra
surrounding the copper ions are discussed. The estimation of the spin-spin interactions deduced from the EPR-relaxation rate
Δ
H reveals a situation comparable to the prototypical one-dimensional S
= 1/2 Heisenberg antiferromagnet CuGeO3. Approaching three-dimensional antiferromagnetic order ( T
N
≈ 2 K) from above, both magnetic relaxation rates, Δ
H
EPR
and
7
(1/
T
1
), respectively, exhibit nearly the same critical divergence reminding to the onset of three-dimensional order in two-dimensional
layered systems.
Received 22 January 2001 and Received in final form 6 May 2001 相似文献
20.
Kh. G. Bogdanova V. A. Golenishchev-Kutuzova M. R. Nazipov M. M. Shakirzyanov S. V. Petrov 《Physics of the Solid State》1999,41(2):265-268
Magnetoacoustic resonance on nuclear spin waves is measured in the cubic antiferromagnet RbMnF3. A resonance change with respect to a constant magnetic field H
0 with maximum damping at H
0≈4×103 Oe is observed in the amplitude of an acoustic pulse passing through a sample owing to excitation of nuclear spin waves under
nuclear magnetoacoustic resonance conditions. A study of the angular dependence of the damping revealed a 90° periodicity
consistent with the fact that the [001] direction, around which the rotation takes place, is a four-fold axis of the crystal.
An analysis of the dispersion law for nuclear spin waves shows that longitudinal ultrasound propagating along the [001] axis
perpendicular to H
0 excites a branch of nuclear spin waves whose frequency depends on the magnitude of the constant magnetic field.
Fiz. Tverd. Tela (St. Petersburg) 41, 297–300 (February 1999) 相似文献