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

Lafuerza, S.; Gretarsson, H.; Hardy, F.; Wolf, T.; Meingast, C.; Giovannetti, G.; Capone, M.; Sefat, A.; Kim, Y.; Glatzel, P.; de' Medici, L.

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

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Gretarsson, H.
Max Planck Society;

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Lafuerza, S., Gretarsson, H., Hardy, F., Wolf, T., Meingast, C., Giovannetti, G., et al. (2017). Evidence of Mott physics in iron pnictides from x-ray spectroscopy. Physical Review B, 96(4): 045133.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D472-2

Abstract

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.