Van Hove features in BSCCO(2212) and effective parameters for Ni impurities inferred from STM spectra

Details Van Hove features in BSCCO(2212) and effective parameters for Ni impurities inferred from STM spectra Van Hove features in BSCCO(2212) and effective parameters for Ni impurities inferred from STM spectra

2002-05-06

arxiv.org/abs/cond-mat/0205079v1

Phys. Rev. B 66, 060504(R) (2002)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.66.060504

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 BSCCO(2212). 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.

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