Sergey G Lebedev

Title : Contemplation about superconducting correlations in nanographite films

Abstract:

Report discussed some unconventional electromagnetics properties of nanographite (NG) films which reminiscent room temperature superconductivity. NG film is the composite of 20-30Å graphite clusters embedded in amorphous matrix. At such a small dimension the superconductivity can be explained by the attraction of all electrons to all kernels of atoms constituting the graphite cluster. Possibilities of room temperature weak superconductivity in nanographite films are supported by the observation of reversed Josephson Effect (which is the transformation of microwave irradiation falling on the sample into the direct current through this sample) and its dependence on temperature, frequency and alternative current voltage. These dependencies are fully reminiscent the behavior of known superconductors, but in the case of NG films such a dependencies takes place at room temperature. Another effect is switching conductivity from high to very small value at some critical current (which can be used in electrical switchers), pinning of vortices on columnar topological structure of film surface observed in atomic force and magnetic force microscope, non-zero current at zero voltage in scanning tunneling microscope in local area of nanographite film surface. Terahertz coherent light emission has been observed under switching process in NG film (which can be used for new type of lasers). The report discussed the opportunity to transform the local room-temperature superconducting phase in nanographite film into the state with the overall phase coherency (which promises the production of new types of room temperature superconductors). The hope is related with production of new pinning centers by means heavy ions irradiation.

Audience take-away:

• Possible room temperature superconductivity in nanographite films.
• New types of electrical switchers.
• New types of lasers.

Biography:

Sergey G. Lebedev was born in 1956 in the sity of Kursk, Russia. Dr. Sergey G. Lebedev has graduated from the Moscow Physical Engineering Institute in 1980.  In 1983 S. G. Lebedev has graduated from Dept. of Mathematics of the Lomonosov Moscow State University. Since 1980 up to now he has worked at the Institute for Nuclear Research of Russian Academy of Sciences. In 1990 S. G. Lebedev has obtained his PhD. Dr. Lebedev is the author of about 150 scientific articles. He is a member of International Nuclear Target Development Society. The whole point of his life is in science and his whole life devoted to science. The prime interests of S. G. Lebedev are in nuclear physics, solid state physics and superconductivity. Now he occupied the position of Senior Scientist, Head of research team.