A Novel Spectral Photoconductivity of the Ba–Pb–Bi–O System Correlative with Superconductivity

Abstract

Another echo-like “Novel Spectral Photoconductivity potentially correlative with Superconductivity” has been reasonably observed also in the Ba–Pb–Bi–O system, as expected naively from the results of the Y–Cu–O, Y–Ba–Cu–O and La–Cu–O systems by improving similar experimental procedures. A new novel spectral photoconductivity of the Ba–Pb–Bi–O freshly features the polarons and excitons in the Bi₂O₃-like part in the system. On the basis of these preliminary results on the Ba–Pb–Bi–O system together with those of Bi₂O₃, we can reconfirm substantial roles of “a coherent ensemble of united polarons and excitons” in the mechanisms of the high-T_c superconductivity in these series of compound superconductors.