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25 April 2024

» arxiv » 1301.3719

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Point-contact spectroscopy in Co-doped CaFe2As2: nodal superconductivity and topological Fermi surface transition
R. S. Gonnelli ; M. Tortello ; D. Daghero ; R. K. Kremer ; Z. Bukowski ; N. D. Zhigadlo ; J. Karpinski ;
Date:	Wed, 16 Jan 2013 15:20:16 GMT (1818kb)
Abstract:	We performed point-contact Andreev reflection spectroscopy measurements in Ca(Fe_{1-x}Co_x)2As2 single crystals with effective x=0.060 +- 0.005. The spectra of ab-plane contacts show a zero-bias maximum and broad shoulders at about 5-6 meV. Their fit with the three-dimensional Blonder-Tinkham-Klapwijk model (making use of a analytical expression for the Fermi surface that mimics the one calculated from first principles) shows that this compound presents a large isotropic gap on the quasi-2D electronlike Fermi surface sheets and a smaller anisotropic (possibly nodal) gap on the 3D holelike Fermi surface pockets centered at the Z point in the Brillouin zone. These results nicely fit into the theoretical picture for the appearance of nodal superconductivity in 122 compounds.
Source:	arXiv, 1301.3719
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