Effect of illumination on the superconducting transition temperature T-c in YBa2Cu3O6+x

In the present study, we have employed two dimensional ASYNNNI model and the numerical Monte Carlo simulations to investigate the effect of visible light or ultraviolet radiation on the doping p of the superconducting CuO2 planes, and consequently on the superconducting transition temperature T-c, in YBa2Cu3O6+x high-T-c superconductor. It was shown that, depending on the oxygen concentration, x, three regions of different critical temperatures T-c behavior could be distinguished. In the first region where x LT 0.6 the critical temperature increases rapidly with oxygen depletion, in the second region, 0.6 LT x LT 0.75, the total T-c change, delta T-c, is almost independent of the oxygen content thus forming some kind of plateau, while in the third region, 0.75 LT x LT 1.0, the T-c does not increase significantly. Such a theoretically obtained behavior of T-c is in general agreement with the experimentally established facts on the delta 7(c), vs. x dependence. (C) 2011 Elsevier B.V. All rights reserved.5th International Conference on Elementary Processes in Atomic Systems (CEPAS), Jun 21-25, 2011, Belgrade, Serbi