SPECTROSCOPY OF THE IRRADIATED YBA2CU3OX SUPERCONDUCTORS

Complex investigations of the photoinduced changes in YBa2Cu3Ox single crystals were performed. As laser sources the low-power He-Ne, He-Cd, He-Se, N2 lasers and YAG:Nd, XeCl pulsed lasers were used. For the investigations the crystalline samples both in super- and semiconducting phases were chosen. A considerably strong dependence of a defectiveness parameter x on the laser power, wavelength and external conditions was observed. The oxygen parameter x shows a tendency to increase for the initially semiconducting phase and to decrease for superconductors. The most interesting results were obtained using XeCl excimer laser, where corresponding changes were observed only under applied hydrostatic pressure (up to 200 MPa) in oxygen atmosphere. In all the cases the penetration depth of the new induced superconducting phase was within 5.5-6.5 mum.