Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819893 | Physica C: Superconductivity and its Applications | 2007 | 4 Pages |
Abstract
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 (Ï, 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.
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
Y.X. Xiao, T. Sato, K. Terashima, H. Matsui, T. Takahashi, M. Kofu, K. Hirota,