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16 February 2025
 
  » arxiv » 1109.0116

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Unconventional Mott Transition in KxFe2-ySe2
L. Craco ; M.S. Laad ; S. Leoni ;
Date 1 Sep 2011
AbstractWhether the newly discovered KxFe2-ySe2 systems are doped Mott or band insulators is key to how superconductivity emerges at lower temperature. With extant theoretical studies supporting conflicting scenarios, a more realistic approach is urgently called for. Here, we use LDA+DMFT to study this issue in KxFe2-ySe2. We find that the undoped KFe1.6Se2 system is a new kind of Mott-Kondo insulator (MKI). Electron doping this MKI drives a Mott transition to an orbital-selective non-Fermi liquid metal. Good agreement with spectral and transport responses supports our view, implying that superconductivity arises from a doped Mott insulator, as in the high-Tc cuprates.
Source arXiv, 1109.0116
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