Rare earth ion effects on the pseudo-gap in electron-doped superconductors and possible nodeless d-wave gap

S. R. Park, C. S. Leem, Y. S. Roh, K. J. Choi, J. H. Kim, B. J. Kim, H. Koh, H. Eisaki, D. H. Lu, Z. X. Shen, N. P. Armitage, C. Kim

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Abstract

We report angle resolved photoemission (ARPES) studies on electron-doped cuprate superconductor Sm2 - x Cex CuO4 (x = 0.14 and 0.18). A wide energy range scan shows clear "waterfall" effect at an energy scale close to 500 meV which is consistent with the value found in Nd2 - x Cex CuO4 (NCCO) but larger than that from hole-doped superconductors. High resolution results from both dopings show pseudo-gap effects that were observed in NCCO. However, the effects are found to be stronger than that observed in optimally doped NCCO. The overall electronic structure is well understood within a simple model in which a sqrt(2) × sqrt(2) static order is assumed. Both ARPES and optical measurements give the coupling strengths to the Q=(π / 2, π / 2) (due to the sqrt(2) × sqrt(2) order) to be about 0.1 eV, compatible with each other. The effect is strong enough to push the band near the nodal region below the Fermi energy, resulting in possible nodeless d-wave superconductivity where zero energy quasi-particle excitation is inhibited.

Original languageEnglish
Pages (from-to)2939-2943
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume69
Issue number12
DOIs
Publication statusPublished - 2008 Dec

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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    Park, S. R., Leem, C. S., Roh, Y. S., Choi, K. J., Kim, J. H., Kim, B. J., Koh, H., Eisaki, H., Lu, D. H., Shen, Z. X., Armitage, N. P., & Kim, C. (2008). Rare earth ion effects on the pseudo-gap in electron-doped superconductors and possible nodeless d-wave gap. Journal of Physics and Chemistry of Solids, 69(12), 2939-2943. https://doi.org/10.1016/j.jpcs.2008.06.116