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- W2730945197 abstract "We investigate the magnetic phase diagram of the newly discovered iron-based high temperature oxypnictide superconductors of the type RO$_{1-x}$F$_x $FeAs, with rare earths R=La, Sm, Nd, Pr and Ce by means of {it ab initio} SGGA and SGGA+U density functional computations. We find undoped LaOFeAs to be a Mott insulator when incorporating electronic correlations via SGGA+U for any physically relevant value of $U$. The doped compounds are according to SGGA conductors with a transition from an antiferromagnetic to a non-magnetic state at a hole doping of concentration $x_c$=0.075 for R=Nd, Pr and at electron doping $x_c$=0.25 for Ce and 0.6 for Sm. Superconductivity in these rare-earth oxypnictides thus appears in the vicinity of a magnetic quantum critical point where electronic correlations are expected to play an important role because of the vicinity of a Mott insulating state at zero doping." @default.
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- W2730945197 date "2008-04-06" @default.
- W2730945197 modified "2023-09-27" @default.
- W2730945197 title "Quantum Critical Point in Rare-Earth Oxypnictides ReO_{1-x}F_xFeAs (Re=Sm, Nd, Pr, Ce)" @default.
- W2730945197 hasPublicationYear "2008" @default.
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