2008/03/31 by T. Kato, Takuya Kato, T. Maruyama +5 · 2 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.77.054710
published as J. Phys. Soc. Jpn. 77, 054710 (2008) · 5 pages, 4 figures, to be published in J. Phys. Soc. Jpn Vol.77 No.5
arxiv created 2008/04/07 · openalex publication_date 2008/04/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Scanning tunneling microscopy and spectroscopy have been performed on superconducting La2-xSrxCuO4 (x=0.06, 0.12, 0.16, and 0.21) at 4.2 K. Atomically resolved surface topography has been observed on the ab surface, which exhibits a one-dimensional structure corresponding to the buckling pattern of the orthorhombic phase. The tunneling spectra of all samples exhibit kinks at about ± 5 meV in addition to the energy gap, indicating the existence of two energy scales. While the gap magnitude varies on the length scale of a few nm and steadily increases upon underdoping, the kink energy is spatially uniform on the surface and almost independent of the doping level.