Single-particle excitation gap in La2-xSrxCuO4 studied by high-resolution angle-resolved photoemission

Y. X. Xiao, T. Sato, K. Terashima, H. Matsui, T. Takahashi, M. Kofu, K. Hirota

Research output: Contribution to journalArticlepeer-review


We report angle-resolved photoemission spectroscopy on optimally doped high-Tc superconductor La1.85Sr0.15CuO4 (Tc = 37 K) to elucidate the character of low-energy excitations in the superconducting state. We find a clear evidence for the emergence of a sharp superconducting quasiparticle peak below Tc together with opening of a superconducting gap at off-nodal region, while no signature of a quasiparticle peak is observed at (π, 0). From the comparison of spectral lineshape and energy dispersion between the nodal and the off-nodal region, we conclude that there are two characteristic energy scales (70 and 20 meV) in the superconducting state of optimally doped La1.85Sr0.15CuO4.

Original languageEnglish
Pages (from-to)44-47
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue numberSUPPL.
Publication statusPublished - 2007 Oct 1


  • Electronic structure
  • High-T superconductor

ASJC Scopus subject areas

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


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