SUPERCONDUCTING PROPERTIES AND STRUCTURE OF VANADIUM AFTER CRYOGENIC DEFORMATION

The effect of low temperature (77 K) deformation by drawing (80%) on t he superconducting properties and structure of vanadium is studied. Th e structural elements (fragment boundaries) responsible for the observ ed changes of critical parameters are isolated. The electron-phonon co upling constant and the electron mean free path undergo most significa nt changes in these regions of rotational deformation localization, wh ich have a high density of defects and are powerful sources of interna l stresses. The dislocation density at the fragment boundaries is esti mated. (C) 1998 American Institute of Physics. [S1063-777X(98)00903-7] .