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

Abstract

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${}_2$.

4+ pages, three figures

References in corpus (6)

• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Inelastic Light Scattering From Correlated Electrons
• The challenge of unravelling magnetic properties in LaFeAsO
• Spin fluctuations and superconductivity in a 3D tight-binding model for BaFe2As2
• Theory of Raman response in a superconductor with extended s-wave symmetry: Application to Fe-pnictides
• Theory of Raman scattering from Leggett's collective mode in a multiband superconductor: Application to MgB${}_2$

Cited by in corpus (16)

• Inter-pocket pairing and gap symmetry in Fe-based superconductors with only electron pockets
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Alternative route to charge density wave formation in multiband systems
• Possible three dimensional nodes in the $s\pm$ superconducting gap of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Superconducting Properties of the $s^{\pm }$-wave state: Fe-based superconductors
• Signature of the Leggett mode in the A1g Raman response: from MgB2 to iron-based superconductors
• Phonon, Two-Magnon and Electronic Raman Scattering of Fe1+yTe1-xSex
• Optical conductivity and Raman scattering of iron superconductors
• Anisotropic quasiparticle lifetimes in Fe-based superconductors
• Collective modes in multiband superconductors: Raman scattering in iron selenides
• Non-Fermi-Liquid Transport Phenomena and Superconductivity Driven by Orbital Fluctuations in Iron Pnictides: Analysis by Fluctuation-Exchange Approximation
• ${}^{75}$As NMR of Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$ in High Magnetic Field
• Signatures of Hund Metal and finite-frequency nesting in Sr${}_2$RuO${}_4$ Revealed by Electronic Raman Scattering
• Superconducting gap and nematic resonance at the quantum critical point observed by Raman scattering in $\mathrm{BaF}{\mathrm{e}}_2({\mathrm{As}}_{1-x}{\mathrm{P}}_x{)}_2$
• Superconducting Gaps via Raman Scattering in Iron Superconductors
• Isotropic multi-gap superconductivity in BaFe1.9Pt0.1As2 from thermal transport and spectroscopic measurements