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Article overview
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Unconventional Mott Transition in KxFe2-ySe2 | L. Craco
; M.S. Laad
; S. Leoni
; | Date: |
1 Sep 2011 | Abstract: | Whether 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 | Services: | Forum | Review | PDF | Favorites |
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