arXiv subjects

S. G. Lebedev

Publications and source records attributed to S. G. Lebedev.

8 recordsLinked to original sources

arXiv2010

Phonon Resonators : The Building Blocks of Nanocomposite Adjusting the Electron - Phonon Interaction

The nanocrystallite have the finite number of the oscillation modes. Their number increases proportionally to a cube of the characteristic size. Thus the oscillation spectrum of nanocrystal becomes discrete, and the separate modes of oscillations does not interact with each other, that considerably strengthens all phonon modulated processes in a crystal. Covering of such a nanocrystallite with the shielding surface of a material with the higher nuclear weight will allow to create the phonon resonators whose oscillation modes will represent the standing waves and, will be amplified by the resonant manner. The composites made of phonon resonators will allow to produce a perspective functional material for the electronics with adjustable structure and properties. Some new mechanism of HTS based on phonon resonators is proposed.

cond-mat.supr-con↗

arXiv2008

Search for the Reasons of Josephson Like Behavior of Thin Granular Carbon Films

This review is described some new results in the studies of anomalous electromagnetic of thin carbon films. Starting with historical sketch of studies of superconductivity and electromagnetic in carbonaceous materials the efforts of such persons as the Nobel Prize winners Vitaly L.Ginzburg and W.A.Little, the Polish outstanding scientist K.Antonowicz, the Americans J.T.Chen, Liren Zhao and Bor Z. Jang, the German researcher P.Esquinazy and his group, the Russian scientists T.L.Makarova, V.I.Tsebro, O.E.Omelyanovskii and A.P. Moravskii, and the Chinese scientists G.M.Zhao and Y.S.Wang has been mentioned. The work presents the study of some new anomalous electromagnetic effects in graphite-like thin carbon films. These are: The fast switching (10-9 sec) of electrical conductivity The detection of microwave radiation and its temperature dependence The oscillations of film stack magnetization in a magnetic field of 1-5 T The generation of optical radiation during the spasmodic switching of conductivity These effects are explained to be the consequence of carbon films granular structure, which can be considered as the Josephson junction array (JJA). The description of theory of the reversed ac Josephson effect (RJE) and its application to the search of high-temperature superconducting (SC) phase in granular materials was done. As for magnetic properties the description of the technique of P.Barbara and co-workers, A.P.Nielsen e.a., C.Auletta et al., Mahesh Chandran and other scientists on studies of two-dimensional JJA has been added. The both mentioned techniques have been applied to analyze the data on electromagnetic measurements in the thin granular carbon films.

cond-mat.supr-con↗

arXiv2007

Phonon Resonant Cavities as a Promising Building Blocks of Hand-Made Nanocrystalline Matter

The nanocrystallite have the finite number of the oscillation modes. Their number increases proportionally to a cube of the characteristic size. Thus the oscillation spectrum of nanocrystal becomes discrete, and the separate modes of oscillations does not interact with each other, that considerably strengthens all phonon modulated processes in a crystal. Covering of such a nanocrystallite with the shielding surface of a material with the higher nuclear weight will allow to create the phonon resonant cavity whose oscillation modes will represent the standing waves and, will be amplified by the resonant manner. The composites made of phonon resonant cavities will allow to produce a perspective functional material for the electronics with adjustable structure and properties.

cond-mat.supr-con↗

arXiv2007

Calculation of The Lifetimes of Thin Stripper Targets Under Bombardment of Intense Pulsed Ions

The problems of stripper target behavior in the nonstationary intense particle beams are considered. The historical sketch of studying of radiation damage failure of carbon targets under ion bombardment is presented. The simple model of evaporation of a target by an intensive pulsing beam is supposed. Stripper foils lifetimes in the nonstationary intense particle can be described by two failure mechanisms: radiation damage accumulation and evaporation of target. At the maximal temperatures less than 2500K the radiation damage are dominated; at temperatures above 2500K the mechanism of evaporation of a foil prevails. The proposed approach has been applied to the discription of behaviour of stripper foils in the BNL linac and SNS conditions.

physics.acc-ph↗

arXiv2006

Correlations Between Switching of Conductivity and Optical Radiation Observed in Thin Graphite-Like Films

The satisfactory explanation of abnormal electromagnetics in thin graphite-like carbon films till now is absent. The most comprehensible explanation may be the high-temperature superconductivity (HTSC). Times of spasmodic switching of electrical conductivity are measured in this work in graphite-like nanostructured carbon films, produced by methods of the carbon arc (CA) and chemical vapor deposition (CVD), which have made 1 and 2 nanoseconds correspondingly. So fast switching completely excludes the thermal mechanism of the process. According to HTSC logic, in the time vicinity close to jump of electroresistance it is necessary to expect the generation of optical radiation in infrared (IR) range. This work presents the first results on registration of IR radiation caused by sharp change of conductivity in thin graphite-like carbon films.

cond-mat.supr-con↗

arXiv2005

Development of the Charge Particle Detector Based on CVD - Diamond

High radiation hardness, chemical resistance, high temperature operation capabilities stimulate a growing interest to use diamond materials as detectors of ionizing radiation. Samples of CVD-diamond materials in sizes 12 square mm and 4 square mm with thickness from 50 microns up to 500 microns have been grown in INR RAS using a DC glow discharge in a mixture of gases CH4/H2 on molybdenum substrates.

physics.ins-det↗

arXiv2005

Gaseous Radiochemical Method for Registration of Ionizing Radiation and Its Possible Applications in Science and Industry

This work presents a new possibility of registration of ionizing radiation by the flowing gaseous radiochemical method (FGRM). The specified method uses the property of some solid crystalline lattice materials for a free emission of radioactive isotopes of inert gas atoms formed as a result of nuclear reactions. Generated in an ampoule of the detector, the radioactive inert gases are transported by a gas-carrier into the proportional gas counter of the flowing type, where the decay rate of the radioactive gas species is measured. This quantity is unequivocally related to the flux of particles (neutrons, protons, light and heavy ions) at the location of the ampoule. The method was used to monitor the neutron flux of the pulsed neutron target "RADEX" driven by the linear proton accelerator of INR RAS. Further progress of the FGRM may give rise to possible applications in nuclear physics, astrophysics and medicine, in the nondestructive control of fissionable materials, diagnostics of thermonuclear plasma, monitoring of fluxes and measurement of spectra of bombarding particles.

nucl-ex↗

arXiv2000

Possible consequences of introduction of the discrete carrier of material fields

In this work some probable consequences of introduction of discrete medium - carrier for fields of a substance are considered. The given medium is thinked as a set of harmonic oscillators filling all space. Discrete medium is introduced on an image and similarity of a crystalline lattice of a condensed matter. The particles - excitation are concentrated in space of a "reciprocal lattice " of discrete medium. This leads to the violation of the energy and momentum conservation laws at the wave number of particles higher then the wave number of the reciprocal lattice. Some possible confirmation of the given consideration may be the behavior of cosmic rays at high energy. The other possible consequences of the proposed approach in physics of elementary particles, cosmology, and quantum mechanics are also discussed.

quant-ph↗