Coexistence of a pseudogap and a superconducting gap for the high-Tc superconductor La2-xSrxCuO4 studied by angle-resolved photoemission spectroscopy

T. Yoshida, W. Malaeb, S. Ideta, D. H. Lu, R. G. Moor, Z. X. Shen, M. Okawa, T. Kiss, K. Ishizaka, S. Shin, Seiki Komiya, Yoichi Ando, H. Eisaki, S. Uchida, A. Fujimori

研究成果: Article査読

19 被引用数 (Scopus)

抄録

The relationship between the superconducting gap and the pseudogap has been the subject of controversies. In order to clarify this issue, we have studied the superconducting gap and pseudogap of the high-Tc superconductor La2-xSrxCuO4 (x=0.10,14) by angle-resolved photoemission spectroscopy (ARPES). Through the analysis of the ARPES spectra above and below Tc, we have identified a superconducting coherence peak even in the antinodal region on top of the pseudogap of a larger energy scale. The superconducting peak energy nearly follows the pure d-wave form. The d-wave order parameter Δ0 [defined by Δ(k)=Δ0(coskxa-coskya)] for x=0.10 and 0.14 are nearly the same, Δ0∼12-14meV, leading to strong coupling 2Δ0/kBTc∼10. The present result indicates that the pseudogap and the superconducting gap are distinct phenomena and can be described by the "two-gap" scenario.

本文言語English
論文番号014513
ジャーナルPhysical Review B
93
1
DOI
出版ステータスPublished - 2016 1月 19
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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