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171.
Yu. V. Kislinskii P. V. Komissinski K. Y. Constantinian G. A. Ovsyannikov T. Yu. Karminskaya I. I. Soloviev V. K. Kornev 《Journal of Experimental and Theoretical Physics》2005,101(3):494-503
We have detected experimentally considerable deviations of the frequency dependences of the Shapiro step amplitudes and the critical current of Nb/Au/YBa2Cu3Ox thin-film hybrid Josephson heterojunctions prepared on YBa2Cu3Ox metal-oxide superconductor films with a tilted c axis from the regularities inherent in Josephson junctions of traditional superconductors with an s-symmetry of the order parameter. It is shown that possible formation of “splintered” fluxons with a size λs<λJ due to faceting of the interface and formation of a chain of nanosize 0 and π junctions must be taken into account in describing processes in lumped heterojunctions (whose size L is smaller than the Josephson penetration depth λJ determined from the averaged value of the critical current density). For heterojunctions with a size λs < L < λJ, a substantial decrease in the maximal amplitude of the first Shapiro step with increasing voltage (Josephson oscillation frequency) is observed at voltages much smaller than the energy gap in niobium (V « ΔNb/e); this effect is manifested most strongly when the size L is greater than λs. A fractional Shapiro step and a subharmonic detector response have been observed in the current-voltage characteristics of heterojunctions; the dynamic processes responsible for their emergence and indicating the presence of the second harmonic in the current-phase relation are studied. It is shown that the effect of interface faceting on the current-phase relation increases with a heterojunction size L>λs. 相似文献
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WANG Tie-Shan PENG Hai-Bo Ovsyannikov V P Kentsch U Ullmann F CHENG Rui Zschornack G 《中国物理C(英文版)》2008,32(5)
In this work.highly charged ions have been extracted from the advanced Electron Beam Ion Source (EBIS-A) developed in a scientific cooperation between the Dresden University of Technology and the DREEBIT GmbH Dresden.The charge state distributions of ions extracted from the EBIS-A are measured in and extracted in the leaky mode.3×105 Ar18+ ions per pulse are extracted in the pulse mode.The ion charge state distribution is a function of the ionization time. 相似文献
176.
N.F. Zobov S.V. Shirin R.I. Ovsyannikov O.L. Polyansky S.N. Yurchenko R.J. Barber J. Tennyson R.J. Hargreaves P.F. Bernath 《Journal of Molecular Spectroscopy》2011,269(1):104-108
A recently-recorded set [Hargreaves et al., Astrophys. J., in press] of Fourier transform emission spectra of hot ammonia is analyzed using a variational line list. Approximately 3350 lines are newly assigned to mainly hot bands from vibrational states as high as v2 = 2. 431 new energy levels of these states are experimentally determined, considerably extending the range of known rotationally-excited states. Comparisons with a recent study of high J levels in the ground and first vibrational states [Yu et al., J. Chem. Phys., 133 (2010) 174317] suggests that while the line assignments presented in that work are correct, their energy level predictions suffer from problems associated with the use of very high-order perturbation series in the effective Hamiltonian. It is suggested that variational calculations provide a more stable method for analyzing spectra involving highly-excited states of ammonia. 相似文献
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S. Yu. Turishchev E. V. Parinova F. Kronast R. Ovsyannikov N. V. Malashchenok E. A. Streltsov D. K. Ivanov A. K. Fedotov 《Physics of the Solid State》2014,56(9):1916-1921
Arrays of Ni rods (~500 nm diameter) formed by the ion-track technology in combination with electrochemical deposition into a SiO2 matrix on the surface of single-crystal silicon plates have been investigated using photoemission electron microscopy with high-intensity synchrotron (undulator) radiation. An analysis of the Ni L 2,3 X-ray absorption near-edge structure (XANES) spectra has demonstrated that rod-like structures in pores and connecting bridges between the rods are formed by a metallic nickel phase, which is stable to oxidation by atmospheric oxygen. No formation of intermediate compound phases (nickel silicides and oxides) is observed at the Ni/SiO2 heterojunction, whereas oxidized nickel(II) species are identified on the surface of the SiO2 matrix, which presumably can be attributed to nickel silicate and hydroxide compounds formed upon nickel(II) chemisorption in electrochemical deposition electrolytes. 相似文献
179.
A. O. Ivanov Z. N. Ovsyannikov N. P. Strelkova A. A. Tuzhilin 《Moscow University Mathematics Bulletin》2012,67(5-6):189-194
A.O. Ivanov and A.A. Tuzhilin proposed a particular case of Gromov??s minimal fillings problem generalized to the case of stratified manifolds using weighted graphs with a nonnegative weight function as minimal fillings of finite metric spaces. In this paper we introduce generalized minimal fillings, i.e., the minimal fillings where the weight function is not necessarily nonnegative. We prove that for any finite metric space its minimal filling has the minimum weight in the class of its generalized fillings. 相似文献