Anomalous momentum dependence of the superconducting coherence peak and its relation to the pseudogap of La1.85Sr0.15CuO4

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

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84 Citations (Scopus)

Abstract

We performed high-resolution angle-resolved photoemission spectroscopy on La1.85Sr0.15CuO4 to study the nature of the single-particle excitation gap. We found that there is a well-defined superconducting coherence peak in the off-nodal region while it is strongly suppressed around the antinode. The momentum dependence of the single-particle excitation gap shows a striking deviation from the dx2-y2-wave symmetry with anomalous enhancement around the antinode in both the superconducting and the pseudogap state. The observed close correlation between the superconducting coherence peak and the pseudogap suggests a substantial contribution of the pseudogap to the anomalous behavior of the gap in the superconducting state.

Original languageEnglish
Article number017003
JournalPhysical Review Letters
Volume99
Issue number1
DOIs
Publication statusPublished - Jul 6 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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