期刊
PHYSICAL REVIEW B
卷 78, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.134511
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资金
- Emmy-Noether Program of the DFG [RO-2460]
- MPIPKS
We describe the correlated electronic structure of a prototype Fe-pnictide superconductor, SmO1-xFxFeAs, using local-density approximation plus dynamical mean-field theory. Strong, multiorbital electronic correlations generate a low-energy pseudogap in the undistorted phase, giving a bad, incoherent metal in qualitative agreement with observations. Very good semiquantitative agreement with the experimental spectral functions is seen (for U=4.0 eV and J(H)=0.7 eV) and interpreted within a correlated, multiorbital picture. Our results show that Fe pnictides should be understood as low-carrier density, incoherent metals, in resemblance to the underdoped cuprate superconductors.
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