排序方式: 共有34条查询结果,搜索用时 15 毫秒
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R. F. Mamin S. A. Migachev M. F. Sadykov I. V. Lunev V. V. Izotov Yu. A. Gusev 《JETP Letters》2003,78(11):718-721
The action of illumination on the conducting and dielectric properties of lead magnoniobate was investigated. The photostimulated currents were examined and the spectral dependence of photoconductivity in the region of diffuse phase transition was obtained. It was found that the illumination affects the dielectric properties and that its action is memorized at temperatures below room temperature. The role of defect states in the formation of relaxor properties is discussed on the basis of the obtained data. 相似文献
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Demin D. L. Dzhelepov V. P. Filchenkov V. V. Grafov N. N. Grebinnik V. G. Migachev D. V. Konin A. D. Rudenko A. I. Sidorov V. T. Zhestkov Yu. G. Zinov V. G. Davies J. D. Bom V. R. van Eijk C. W. E. 《Hyperfine Interactions》1996,101(1):13-19
The ddµ molecule formation rate is experimentally measured for the two hyperfine states of the dµ-atom in the temperature range of 5–30 K. Results are consistent with a preliminary measurement by the TRIUMF group and contradict theoretical predictions. The work has been performed on the JINR phasotron (Dubna). 相似文献
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I. Sh. Akhmadullin S. A. Migachev M. F. Sadykov M. M. Shakirzyanov 《Physics of the Solid State》2004,46(2):312-315
An experimental study of the magnetic birefringence of sound in the α-Fe2O3 easy-plane antiferromagnet is reported. The amplitude of transverse sound transmitted through the crystal along the C3 trigonal axis was found to oscillate depending on the magnitude of the magnetic field H applied in the basal plane (H ⊥ C3). The experiments provide qualitative support for the theory of this phenomenon developed earlier by Turov. Possible reasons for the substantial quantitative disagreement between theory and experiment observed in the field dependence of the sonic-amplitude oscillation period are discussed. Unannealed samples of the hematite revealed a 60° periodic dependence of the position of the intensity oscillation extrema on magnetic field orientation in the basal plane, which is associated with basal anisotropy of higher than second order. The observation of pronounced (~6×103 Oe) effective magnetic anisotropy fields in the basal plane can be assigned to the existence of large residual strains in such samples. 相似文献
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V. G. Alpatov Yu. D. Bayukov A. V. Davydov Yu. N. Isaev G. R. Kartashov M. M. Korotkov V. V. Migachev I. N. Rozantsev M. G. Shchepkin 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(6):769-772
Experiments on the search for the effect of resonant screening on the Mössbauer absorption of 119m Sn γ rays of energy 23.8 keV emitted by a standard Mössbauer Ca119m SnO3 γ source in the resonant SnO2 absorber of natural isotopic composition are described. Intensities of tin γ rays and X-rays that passed through the absorber were measured with and without a resonant cylindrical screen (which was a black absorber for the 23.8-keV Mössbauer γ line) around the absorber and their ratios were calculated for each radiation separately. No difference beyond the experimental error was found between these ratios measured with the γ source both at rest and when oscillating with a frequency and amplitude enough to completely break the conditions for Mössbauer resonant absorption of 23.8-keV γ rays. The upper limit for the relative decrease, due to the influence of the resonant screen, in the intensities of these γ rays after their passing through the resonant absorber was 0.00030. 相似文献
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Yu. D. Bayukov A. V. Davydov Yu. N. Isaev G. R. Kartashov M. M. Korotkov V. V. Migachev 《JETP Letters》2009,90(7):499-503
Experiments confirming the previous data on the small real width of the γ resonance of 109m Ag have been performed with a gravitational gamma-ray spectrometer. The achieved resolution is eight orders of magnitude higher than that of Mössbauer spectrometers using gamma rays from a 57Fe nuclide. The theoretically predicted broadening of the Mössbauer gamma line of 109m Ag by five orders of magnitude (due to the dipole-dipole interaction between the magnetic moments of neighboring nuclei) has not been observed. 相似文献
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I. Sh. Akhmadullin V. A. Golenishchev-Kutuzov S. A. Migachev S. P. Mironov 《Physics of the Solid State》1998,40(7):1190-1192
The electrical conductivity of lithium niobate crystals was investigated at temperatures between 80 and 450 K as a function
of the oxidation-reduction annealing conditions. The results are interpreted in terms of polaron electrical conductivity at
room temperature and above. A reduction in the measurement temperature leads to “freezing out” of small-radius polarons, and
hopping of Heitler-London bipolarons via unfilled NbLi sites becomes the main mechanism responsible for the electrical conductivity.
Fiz. Tverd. Tela (St. Petersburg) 40, 1307–1309 (July 1998) 相似文献