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

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

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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
Externally publishedYes

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antinodes
momentum
excitation
photoelectric emission
deviation
augmentation
high resolution
symmetry
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Anomalous momentum dependence of the superconducting coherence peak and its relation to the pseudogap of La1.85Sr0.15CuO4. / Terashima, Kensei; Matsui, H.; Sato, T.; Takahashi, T.; Kofu, M.; Hirota, K.

In: Physical Review Letters, Vol. 99, No. 1, 017003, 06.07.2007.

Research output: Contribution to journalArticle

Terashima, Kensei ; Matsui, H. ; Sato, T. ; Takahashi, T. ; Kofu, M. ; Hirota, K. / Anomalous momentum dependence of the superconducting coherence peak and its relation to the pseudogap of La1.85Sr0.15CuO4. In: Physical Review Letters. 2007 ; Vol. 99, No. 1.
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