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

    3 Citations (Scopus)


    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 - Oct 1 2007


    • ARPES
    • 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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