The modified superconducting properties of thin films of YBaCuO superconductor were researched after the exposure to the electron radiation with energy 2Λ104eV in magnetic field ~ 3Λ102G at temperature G at temperature T=77K. The diffusion relaxation of a none equilibrium distribution of oxygen and its vacancies generated by the electron radiation reduces in a self-induced appearance of new columnar pinning centers with diameters equal to a few nanometers in region of normal phase cores of magnetic vortices. It is found that this process reduces in change of a sort of dependence of the complex magnetic susceptibility of YBaCuO thin films on the temperature. The diffusion process is accompanied by both the increase of pinning forces and the increase of density of a critical current in YBaCuO thin films, and has an effect on the magnetic susceptibility of superconducting samples. The suggested theoretical mechanism of oxygen and its vacancies diffusion under the operation of the gradient of a superconducting pair potential near to the normal cores of magnetic vortices with value 10Λ4—10Λ5eV/cm explains the observed physical properties. This value of a electrochemical gradient is close to the value observed in crystals near to a dislocation [1].
[1.] F.R.N. Nabarro, Theory of Crystall Dislocations, Clarendon Press, Oxford, 1967, 821 p. |