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

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 $Γ$ -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, $χ_{0} (q, ω)$ , 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.

Bulk electronic structure of optimally doped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

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Bulk electronic structure of optimally doped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

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Bulk electronic structure of optimally doped Ba(Fe1−x1−x​Coxx​)22​As22​

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Bulk electronic structure of optimally doped Ba(Fe1−x1−x​Coxx​)22​As22​

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Bulk electronic structure of optimally doped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

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Bulk electronic structure of optimally doped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

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