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Title: 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 spectroscopies. Exploring K- and Cr-hole-doped BaF e 2 A s 2 , we also find a systematic increase in the local moment with hole-doping, in contrast with inelastic neutron scattering measurements, which suggest an opposite trend. The 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.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4] ; ORCiD logo [5] ;  [6] ;  [1] ;  [1]
  1. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  2. Max Planck Inst. for Solid State Research, Stuttgart (Germany)
  3. Karlsruhe Inst. of Technology (KIT) (Germany)
  4. Democritos National Simulation Centre and International School for Advanced Studies (SISSA), Trieste (Italy)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Univ. of Toronto, ON (Canada)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; PHY11-25915
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 4; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1376599
Alternate Identifier(s):
OSTI ID: 1372543