GLASSY SUPERCONDUCTOR STATE IN LA1.8SR.2CUO4 CERAMICS

We study the history-dependence of diamagnetic response of superconduc ting La1.8Sr.2CuO4 ceramics in a magnetic field. In this material the granulas are weakly coupled by Josephson junctions, and these coupling s are frustrated by the magnetic field. We separate the magnetic respo nse due to intergranular Josephson currents and intragranular currents . We find a strong history-dependence of magnetization which is the ev idence of the ga uge glass state formed in this system at low temperat ure. Our data are in a qualitative agreement with the developed MF the ory of the gauge glass state.