Optical Investigation of a Nonsuperconducting Nd1.85Ce0.15CuO4+y Crystal with Possible Charge Ordering Instability

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

Research output: Contribution to journalArticlepeer-review


We have investigated the temperature variation of optical spectra comparatively for an oxygenated nonsuperconducting and a reduced superconducting crystal of Nd1.85Ce0.15Cu04+y. Anomalous gap-like structure as large as 0.3 eV has been observed in the optical conductivity spectrum of the oxygenated crystal with lowering temperature from 340 K, while little temperature-variation has been observed for the reduced crystal. Furthermore, anomalies in lattice dynamics have been observed only for the oxygenated crystal in far-infrared spectra. These spectral signatures have shown parallel temperature-dependence, signaling a possible charge ordering in the oxygenated nonsuperconducting crystal.

Original languageEnglish
Pages (from-to)1065-1069
Number of pages5
JournalJournal of Low Temperature Physics
Issue number5-6
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics


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