LDA+DMFT Spectral Functions and Effective Electron Mass Enhancement in Superconductor LaFePO

Abstract

In this Letter we report the first LDA+DMFT results (method combining Local Density Approximation with Dynamical Mean-Field Theory) for spectral properties of superconductor LaFePO. Calculated {\bf k}-resolved spectral functions reproduce recent angle-resolved photoemission spectroscopy (ARPES) data [D. H. Lu {\it et al}., Nature {\bf 455}, 81 (2008)]. Obtained effective electron mass enhancement values $m^{\ast }/m\approx$ 1.9 -- 2.2 are in good agreement with infrared and optical studies [M. M. Qazilbash {\it et al}., Nature Phys. {\bf 5}, 647 (2009)], de Haas--van Alphen, electrical resistivity, and electronic specific heat measurements results, that unambiguously evidence for moderate correlations strength in LaFePO. Similar values of $m^{\ast }/m$ were found in the other Fe-based superconductors with substantially different superconducting transition temperatures. Thus, the dynamical correlation effects are essential in the Fe-based superconductors, but the strength of electronic correlations does not determine the value of superconducting transition temperature.

4 pages, 3 figures

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• Electron correlation in FeSe superconductor studied by bulk-sensitive photoemission spectroscopy
• Mass enhancement in 3d and s-p perovskites from symmetry breaking
• Linear-Temperature Dependence of Static Magnetic Susceptibility in LaFeAsO from Dynamical Mean-Field Theory
• Fermi surface topology of LaFePO and LiFeP
• High-energy pseudogap in degenerate Hubbard model induced via Hund coupling
• Microscopic origin of the linear temperature increase of the magnetic susceptibility of BaFe${}_2$As${}_2$
• Phase stability and large in-plane resistivity in the 112-type iron-based superconductor Ca${}_{1-x}$La${}_x$FeAs${}_2$
• Effect of density of states peculiarities on Hund's metal behavior
• Brief review on iron-based superconductors: are there clues for unconventional superconductivity?
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• Spin and charge susceptibilities of the two-orbital model within the cluster perturbation theory for Fe-based materials
• Modified Pade approach for analytic continuation: Application to the zero-gap Kondo lattice model
• Absence of strong magnetic fluctuations in the iron phosphide superconductors LaFePO and Sr2ScO3FeP
• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides