Infrared spectroscopy of pseudogaps in electron-doped superconductors

Kyujin Choi, T. Y. Hong, S. R. Park, D. J. Song, C. Kim, H. Eisaki, Jae H. Kim

Research output: Contribution to journalArticlepeer-review


We have measured the ab-plane reflectivity spectra of n-type single-crystal cuprates R1.85Ce0.15CuO4-δ (R = Nd, Eu, Gd) at temperatures from 10 to 280 K using Fourier-transform infrared (FTIR) spectroscopy. In the mid-infrared (MIR) region, Nd1.85Ce 0.15CuO4-δ (NCCO) does not exhibit pseudogap-like behavior, but Eu1.85Ce0.15CuO4-δ (ECCO) and Gd1.85Ce0.15CuO4-δ (GCCO) clearly exhibit strong pseudogap absorption between 0.15 eV and 0.4 eV. The relevant temperature range varies with the rare-earth element R via a pressure effect. The observed pseudogap evolution is well explained in terms of the antiferromagnetic phase fluctuation.

Original languageEnglish
Pages (from-to)S90-S91
JournalPhysica C: Superconductivity and its applications
Issue numberSUPPL.1
Publication statusPublished - 2010 Dec

Bibliographical note

Funding Information:
This work was supported by KICOS (Contract No. 2008-8-1673 ) and by NRF (Contract No. C00511 ).

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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