2012/08/14 by T. Yoshida, W. Malaeb, Yoshida, T. +32
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1208.2903
5 pages, 4 figures
arxiv created 2012/08/14 · openalex publication_date 2012/08/14 · arxiv updated 2012/08/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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, 0.14) 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 anti-nodal 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(cos(kxa)-cos(kya)) ] for x=0.10 and 0.14 are nearly the same, Δ0 ~ 12-14 meV, leading to strong coupling 2Δ0/kB Tc ~ 10. The present result indicates that the pseudogap and the superconducting gap are distinct phenomena and can be described by the "two-gap" scenario.