Evidences of Mott physics in iron pnictides from x-ray spectroscopy
S. Lafuerza, H. Gretarsson, F. Hardy, T. Wolf, C. Meingast, G., Giovannetti, M. Capone, A. S. Sefat, Y.-J. Kim, P. Glatzel, L. de' Medici
TL;DR
This study uses x-ray spectroscopy to investigate how local magnetic moments evolve with doping in iron pnictides, revealing evidence of Mott physics influencing their phase diagram.
Contribution
It provides experimental evidence linking Mott insulating behavior to doping-dependent magnetic properties in iron pnictides.
Findings
Local magnetic moments increase with hole-doping
Supports the Mott insulator scenario in iron pnictides
Doping influences magnetic fluctuations across the phase diagram
Abstract
X-ray emission and absorption spectroscopies are jointly used as fast probes to determine the evolution as a function of doping of the fluctuating local magnetic moments in K- and Cr- hole-doped BaFe2As2. An increase in the local moment with hole-doping is found, supporting 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.
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