Evidence of Mott physics in iron pnictides from x-ray spectroscopy

The existence of large instantaneous local magnetic moments in paramagnetic phases is a direct signature of Mott localization. In order to track the doping evolution of fluctuating local moments in iron-based superconductors, we jointly use two fast probes, x-ray emission and absorption spectroscopi...

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Bibliographic Details
Published in:Physical review. B 2017-07, Vol.96 (4), Article 045133
Main Authors: Lafuerza, S., Gretarsson, H., Hardy, F., Wolf, T., Meingast, C., Giovannetti, G., Capone, M., Sefat, A. S., Kim, Y.-J., Glatzel, P., de' Medici, L.
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Conduction bands
Doping
Group 5A compounds
Inelastic scattering
Iron
Magnetic moments
Neutron scattering
Neutrons
Phase diagrams
Physics
Variation
X-ray spectroscopy
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Summary:The existence of large instantaneous local magnetic moments in paramagnetic phases is a direct signature of Mott localization. In order to track the doping evolution of fluctuating local moments in iron-based superconductors, we jointly use two fast probes, x-ray emission and absorption spectroscopies. Exploring K- and Cr-hole-doped BaFe2As2, we find a systematic increase in the local moment with hole-doping, in contrast with inelastic neutron scattering measurements, which suggest an opposite trend. Our results support the theoretical scenario in which a Mott insulating state that would be realized for half-filled conduction bands has an influence throughout the phase diagram of these iron pnictides.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.045133