2002/05/06 by Jian-Ming Tang, Jian‐Ming Tang, Michael E. Flatté · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemical and Physical Properties of Materials #Physics of Superconductivity and Magnetism #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.66.060504
published as Phys. Rev. B 66, 060504(R) (2002) · 5 pages, 4 figures
arxiv created 2002/05/06 · openalex publication_date 2002/08/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present a detailed quantitative comparison between theoretical calculations of the local density of states and recent experimental measurements of scanning tunneling spectra around Ni impurities in Bi2Sr2CaCu2O_8+\ensuremathδ. A double-peak structure on the hole side of the spectrum at the Ni site is identified as the spin-split Van Hove singularity in the band structure. The Ni atom induces local changes in hopping matrix elements comparable in size to the induced on-site spin-dependent potential. We find evidence from the measurements of order-parameter suppression in the vicinity of the Ni impurity. These extracted impurity parameters can be of use in quantitative calculations of macroscopic response properties, such as the ac conductivity.