Pinpointing Gap Minima in Ba(Fe$_{0.94}$Co$_{0.06})_{2}$As$_2$ \textit{via} Band Structure Calculations and Electronic Raman Scattering

Details Pinpointing Gap Minima in Ba(Fe$_{0.94}$Co$_{0.06})_{2}$As$_2$ \textit{via} Band Structure Calculations and Electronic Raman Scattering Pinpointing Gap Minima in Ba(Fe$_{0.94}$Co$_{0.06})_{2}$As$_2$ \textit{via} Band Structure Calculations and Electronic Raman Scattering

2010-07-30

arxiv.org/abs/1008.0032v2

Phys. Rev. B 82, 180502(R) (2010)

Physics

Condensed Matter

Superconductivity

4+ pages, three figures

Scientific paper

10.1103/PhysRevB.82.180502

A detailed knowledge of the gap structure for the Fe-pnictide superconductors is still rather rudimentary, with several conflicting reports of either nodes, deep gap minima, or fully isotropic gaps on the Fermi surface sheets, both in the $k_{x}-k_{y}$ plane and along the c-axis. In this paper we present considerations for electronic Raman scattering which can help clarify the gap structure and topology using different light scattering geometries. Using density functional calculations for the Raman vertices, it is shown that the location of the gap minima may occur on loops stretching over a portion of the c-axis in Ba(Fe$_{0.94}$Co$_{0.06})_{2}$As$_2$.

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