Anomalous pseudogap formation in a nonsuperconducting crystal of Nd1.85Ce0.15CuO4+y: Implication of charge ordering

Y. Onose, Y. Taguchi, T. Ishikawa, S. Shinomori, K. Ishizaka, Y. Tokura

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54 Citations (Scopus)


Temperature variation of optical conductivity and Raman spectra has been investigated comparatively for oxygenated antiferromagnetic and reduced superconducting crystals of Nd1.85Ce0.15CuO4+y. While the spectra of the reduced crystal change little with temperature, in the spectra of oxygenated crystal a conspicuous pseudogap structure evolves around 0.3 eV and activated infrared and Raman Cu-O phonon modes grow in intensity, with decreasing temperature from 340 K. The origin is proposed to be charge ordering instability induced by a minute amount of interstitial apical oxygen, which seems to be also responsible for the absence of superconductivity in an oxygenated (or as-grown) crystal.

Original languageEnglish
Pages (from-to)5120-5123
Number of pages4
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 1999 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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