A Novel Spectral Photoconductivity of the Y–Cu–O, Y–Ba–Cu–O Correlative with Superconductivity

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  • Masumi Taizo
    Department of Pure and Applied Sciences, College of Arts and Sciences, University of Tokyo
  • Shimada Hiroshi
    Department of Pure and Applied Sciences, College of Arts and Sciences, University of Tokyo
  • Minami Hidetoshi
    Department of Pure and Applied Sciences, College of Arts and Sciences, University of Tokyo

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  • Novel Spectral Photoconductivity of t

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An onset of “the Novel Spectral Photoconductivity” in accordance with the onset of “Superconductivity” have been observed for the first time in the Y1–Cu2–Oz and Y3−x–Bax–Cu3–O9−y systems below 150 K by applying transient pulse and d.c. techniques for conductivity measurements and by using a microwave SQUID for susceptibility measurements. Novel spectra of photoconductivity of the Y1–Cu2–Oz and Y3−x–Bax–Cu3–O9−y clearly feature the polarons and excitons in the Cu2O-like phase in these oxygen-deficient systems. These results suggest that “an ensemble of united polarons and excitons” must play substantial roles in the mechanisms of high-Tc superconductivity.

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