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Strong-coupling analysis of scanning tunneling spectra in Bi₂Sr₂Ca₂Cu₃O_(10+δ)

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arxiv 1303.2450 v2 pith:O7TI5P3U submitted 2013-03-11 cond-mat.supr-con

Strong-coupling analysis of scanning tunneling spectra in Bi₂Sr₂Ca₂Cu₃O_(10+δ)

C. Berthod , Y. Fasano , I. Maggio-Aprile , A. Piriou , E. Giannini , G. Levy de Castro , {\O}. Fischer This is my paper
classification cond-mat.supr-con
keywords spectrastrong-couplingmodelscanningtunnelingaccountanalysisangle-resolved
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study a series of spectra measured in the superconducting state of optimally-doped Bi-2223 by scanning tunneling spectroscopy. Each spectrum, as well as the average of spectra presenting the same gap, is fitted using a strong-coupling model taking into account the band structure, the BCS gap, and the interaction of electrons with the spin resonance. After describing our measurements and the main characteristics of the strong-coupling model, we report the whole set of parameters determined from the fits, and we discuss trends as a function of the gap magnitude. We also simulate angle-resolved photoemission spectra, and compare with recent experimental results.

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