Fa. Pudonin et al., QUANTUM OSCILLATIONS OF SUPERCONDUCTING TRANSITION-TEMPERATURE AND DIELECTRIC FUNCTION OF NIOBIUM FILMS WITH 2 PLANE DEFECTS, Czechoslovak journal of Physics, 46, 1996, pp. 1023-1024
Oscillations of superconducting transition temperature and dielectric
function of Nb films are experimentally observed in dependence on dist
ance d between two plane defects, inserted in these films. Tile period
of the oscillations is about 6A and closes to half of wave function l
ength of charge carriers on the Fermi level in crystal Nb.