Bulk electronic structure of optimally doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

Abstract

We report high-resolution, bulk Compton scattering measurements unveiling the Fermi surface of an optimally-doped iron-arsenide superconductor, Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$. Our measurements are in agreement with first-principles calculations of the electronic structure, revealing both the $X$-centered electron pockets and the $\Gamma$-centered hole pockets. Moreover, our data are consistent with the strong three-dimensionality of one of these sheets that has been predicted by electronic structure calculations at the local-density-approximation-minimum As position. Complementary calculations of the noninteracting susceptibility, ${\chi }_0(\mathbf{q},\omega )$, suggest that the broad peak that develops due to interband Fermi-surface nesting, and which has motivated several theories of superconductivity in this class of material, survives the measured three dimensionality of the Fermi surface in this family.

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• Directional point-contact Andreev-reflection spectroscopy of Fe-based superconductors: Fermi surface topology, gap symmetry, and electron-boson interaction
• Multigap superconductivity and strong electron-boson coupling in Fe-based superconductors: A point-contact Andreev-reflection study of Ba(Fe1-xCox)2As2 single crystals
• Extracting the Redox Orbitals in Li Battery Materials with High-Resolution X-Ray Compton Scattering Spectroscopy
• Experimental determination of the state-dependent enhancement of the electron-positron momentum density in solids
• Calculating electron momentum densities and Compton profiles using the linear tetrahedron method
• Electronic Quantum Confinement in Cylindrical Potential Well
• Fermi surface of an important nano-sized metastable phase: Al${}_3$Li
• Lindhard and RPA susceptibility computations in extended momentum space in electron doped cuprates
• Slow in-plane magnetoresistance oscillations in multiband quasi-two-dimensional metals