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.

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. S.; Kim, Y. -J.; Glatzel, P.; De'Medici, L.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 96:4(2017), pp. 1-8. [10.1103/PhysRevB.96.045133]

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

Capone, M.;De'Medici, L.
2017-01-01

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.
2017
96
4
1
8
045133
http://harvest.aps.org/bagit/articles/10.1103/PhysRevB.96.045133/apsxml
https://arxiv.org/abs/1607.07417
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....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/68769
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