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20 April 2024

» arxiv » 1009.1572

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Multigap superconductivity and strong electron-boson coupling in Fe-based superconductors: A point-contact Andreev-reflection study of Ba(Fe1-xCox)2As2 single crystals
M. Tortello ; D. Daghero ; G.A. Ummarino ; V.A. Stepanov ; J. Jiang ; R.S. Gonnelli ;
Date:	8 Sep 2010
Abstract:	Directional point-contact Andreev-reflection (AR) measurements performed in Ba(Fe1-xCox)2As2 single crystals (Tc = 24.5 K) indicate the presence of two superconducting gaps whose amplitude is almost independent of the direction, and show no evidence of line nodes on the Fermi surface. The AR spectra also feature additional structures that can be related to the electron-boson interaction. Both the gaps and these structures can indeed be reproduced within a three-band s+- Eliashberg model by using an electron-boson spectral function peaked at Omega0 ~ 12 meV, consistent with the spin resonance observed in neutron scattering experiments.
Source:	arXiv, 1009.1572
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