Impurity effects on the spin excitation spectra in a d-wave superconductor

Details Impurity effects on the spin excitation spectra in a d-wave superconductor Impurity effects on the spin excitation spectra in a d-wave superconductor

1999-01-28

arxiv.org/abs/cond-mat/9901324v1

Phys. Rev. B 58, 2895-2899 (1998)

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures (Fig.3 is available upon request)

Scientific paper

10.1103/PhysRevB.58.2895

The effects of nonmagnetic impurity on the spin excitation spectra in a $d_{x^2-y^2}$-wave superconductor are examined, using the self-consistent $t$-matrix approximation. It is shown that the impurity self-energy acts to shift the position of the resonance peak to low frequencies and broaden the peak. While the impurity vertex correction causes a broad spectral weight in the spin gap at the impurity concentrations where no clear resonance peak is observed. The gaplike feature still remains in low frequency region upon the introduction of impurities. Incorporating these two effects, we find that the result is in qualitative agreement with experiments on YBa_{2}(Cu_{1-x}Zn_{x})_{3}O_{6+y}.

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