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1.
Russian Physics Journal - The paper shows that the values of zero-point energy and vibrations of atoms in a crystal determined by the uncertainty principle, depend on the dynamic response of atoms.... 相似文献
2.
Rozhkov A. V. Sboychakov A. O. Khokhlov D. A. Rakhmanov A. L. Kugel K. I. 《JETP Letters》2020,112(11):725-733
JETP Letters - Studies of a recently suggested mechanism for the stabilization of half-metallic states in doped systems with the nesting of Fermi surface sheets are briefly reviewed. The... 相似文献
3.
S. A. Samoylenko S. E. Kichanov A. V. Belushkin D. P. Kozlenko V. M. Garamus V. S. Gurin E. A. Trusova G. P. Shevchenko S. K. Rakhmanov L. A. Bulavin B. N. Savenko 《Physics of the Solid State》2011,53(12):2431-2434
The structural aspects of the formation of Ti-Ce-O nanoclusters in silicate glasses doped with oxides TiO2 and CeO2 have been studied by means of small-angle neutron scattering. It has been obtained that, in such glasses, complex oxide nanoclusters with sizes of 300–380 Å are formed; their average size increases and the fractal dimension is changed as the concentration of the initial oxides increases. Correlation between the structural characteristics of the nanoclusters and the optical properties of the doped silicate glasses is discussed. 相似文献
4.
We have examined the process of redox dispersion of silver, using a solution simultaneously containing an oxidizing agent
(potassium ferricyanide) and a reducing agent (sodium borohydride). We have studied the changes over time in the Raman spectra
of the indicated solution when no silver particles are present and when such particles are added to the solution. We have
established that the silver particles have a catalytic effect on the reaction between potassium ferricyanide and sodium borohydride,
kinetically slowed down in alkaline medium. The original silver particles (1–20 μm) undergo redox dispersion as a result,
and Ag particles are formed with sizes 1–10 nm.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 2, pp. 182–186, March–April, 2006. 相似文献
5.
G. T. Mavlonov Kh. A. Ubaidullaeva M. I. Rakhmanov I. Yu. Abdurakhmonov A. Abdukarimov 《Chemistry of Natural Compounds》2008,44(2):216-219
A low-molecular-weight protein with antifungal activity was isolated from freshly collected latex of the Inzhir tree (Ficus carica L.) by successive affinity chromatography over chitin, cation-exchange chromatography over SP-Sephadex C-50, and reversed-phase
HPLC. The molecular weight of 6481 and the partial N-terminus sequence of the protein were determined (MALDI-TOFMS).
__________
Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 171–173, March–April, 2008. 相似文献
6.
The formation of droplets (or breathers) of vortex matter in Bi(2)Sr(2)CaCu(2)O(8) crystals pumped by the low-frequency ac magnetic field is observed by magneto-optic imaging. The droplets nucleate at the points of crossing the planar defects. The magnetic flux in the droplet and the droplet size increase with time. When the flux in the droplet exceeds a critical value, the droplet shifts along the defect to the sample bulk and a new droplet with the opposite flux direction starts to nucleate at the same point. As a result, a beadlike structure of the droplets arises along the defect. A possible explanation of the phenomenon is proposed. 相似文献
7.
8.
S.Ya. Rakhmanov 《Solid State Communications》1979,30(12):779-782
The possibility of existance of a super-crystalline (Wigner) phase in a semimetal or impurity semiconductor film placed in a high magnetic field, is discussed and a comparison is made with a crystal in a three-dimensional specimen.
Such a phase exists in a succession of magnetic field or particle density intervals. The vibrational spectrum depends on magnetic field, while the bind energy is only density-dependent. The mean-square displacement x2 of the particles in the lattice sites are also independent on the magnetic field over a wide temperature range. 相似文献
9.
A. Sboychakov A. Rakhmanov K. Kugel I. González J. Castro D. Baldomir 《Journal of magnetism and magnetic materials》2006
The behavior of a one-dimensional antiferromagnetic (AF) chain doped by non-magnetic donor impurities is analyzed, in the limit of low impurity density n . The doping leads to the formation of ferromagnetically correlated regions localized near impurities (bound magnetic polarons or ferrons). The temperature evolution of the chain is calculated using an approximate variational method, and a Monte Carlo simulation. Both these methods give the similar results. The analysis of correlation functions for neighboring local spins demonstrates that the ferromagnetic correlations inside a ferron are significant even at high temperatures. The AF correlations in the rest part of the chain decay much faster with temperature. So, the ferron is a stable object that does not disappear even above the Néel temperature TN. At rather small values of the electron–impurity coupling energy V (for V lower then the electron hopping integral t ), the bound ferron depins from impurity retaining its magnetic structure. Such a depinning occurs at T∼V. 相似文献
10.
The effect of short-term low-temperature annealing in air and in vacuum on the properties of HTSC films of YBCO is studied. It is shown that, under certain conditions of preparation of initial samples, a transition from the HTSC phase with the superconducting transition temperature Tc=90 K to a phase with Tc=60 K occurs without a noticeable change in the oxygen content. It is found that, as a result of short-term annealings, a transition from the HTSC phase with Tc=60 K to the phase with Tc=90 K can occur only through the vacuum annealing stage, which converts the sample into the superconducting state. Short-term annealings lead to multiple reversible “switching” of the films from one phase to another. The obtained results are of practical interest, since the proposed method can be used to quickly obtain superconducting YBCO films in various phase states. It is shown, in addition, that the annealing procedure makes it possible not only to increase the oxygen concentration but also to produce a structural rearrangement of a YBCO film. 相似文献