Distinct doping dependences of the pseudogap and superconducting gap ofLa2−xSrxCuO4cuprate superconductors

2006/10/31 by M. Hashimoto, Makoto Hashimoto, T. Yoshida +13 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.75.140503

published as Phys. Rev. B 75, 140503(R) (2007) · 4 pages, 3 figures

openalex publication_date 2007/04/04 · arxiv created 2007/04/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We have performed a temperature-dependent angle-integrated photoemission study of La_2\ensuremath-xSr_xCuO₄ covering from lightly doped to heavily overdoped regions and oxygen-doped La₂CuO_4.10. The superconducting gap energy \ensuremathΔ_sc was found to remain small for decreasing hole concentration while the pseudogap energy \ensuremathΔ^* and temperature T^* increase. The different behaviors of the superconducting gap and the pseudogap can be explained if the superconducting gap opens only on the Fermi arc around the nodal (0,0)\text\ensuremath-(\ensuremathπ,\ensuremathπ) direction while the pseudogap opens around \ensuremath∼(\ensuremathπ,0). The results suggest that the pseudogap and the superconducting gap have different microscopic origins.

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