FAR-INFRARED MEASUREMENTS OF OXYGEN-DOPED POLYCRYSTALLINE La2CuO4.0315 SUPERCONDUCTOR UNDER SLOW-COOLED AND FAST-COOLED CONDITIONS

Abstract

We have studied the far-infrared (far-IR) charge dynamics of an equilibrated pure oxygen doped La 2 CuO 4.0315 under slow-cooled and fast-cooled conditions. The superconducting transition temperature (Tc) for the slow-cooled and that for the fast-cooled processes were respectively found to be close to the two intrinsic Tc. One at 30 K and the other at 15 K. Direct comparison with our previous results and other far-IR and Raman studies on single crystalline La 2-x Sr x CuO 4, we conclude that the topology of the pristine electronic phases that are responsible for the two intrinsic Tc is holes arranged into two-dimensional (2D) square lattices.