Stability of the Fe electronic structure through temperature-, doping-, and pressure-induced transitions in the BaFe2As2 superconductors
V. Balédent, F. Rullier-Albenque, D. Colson, G. Monaco, J.-P. Rueff
DOI 10.1103/PhysRevB.86.235123 · Physical Review B
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Abstract
We report on a survey of Fe electronic properties in the temperature-pressure phase diagram of the Co-doped pnictides BaFe2As2 superconductors by hard x-ray absorption spectroscopy at the Fe K edge in the high-resolution, partial fluorescence yield mode. The absorption spectra are found remarkably stable through the temperature-induced phase transitions while pressure leads to slight energy shift of the main edge but not of the pre-edge. The latter effect is ascribed to the lattice compression and band widening effects under pressure as confirmed by multiple scattering simulations. Our results suggest that from the Fe electronic structure point of view, doping and pressure are equivalent ways to destabilize the magnetic phase to the advantage of superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | 5.5 GPa | unknown |
| Ba(Fe0.935Co0.065)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | 5.5 GPa | unknown |
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