Rationalizing doping and electronic correlations in LaFe${}_2$As${}_2$

Abstract

We compute the electronic properties of the normal state of uncollapsed LaFe${}_2$As${}_2$, taking into account local dynamical correlations by means of slave-spin mean-field+density-functional theory. Assuming the same local interaction strength used to model the whole electron- and hole-doped BaFe${}_2$As${}_2$ family, our calculations reproduce the experimental Sommerfeld specific heat coefficient, which is twice the value predicted by uncorrelated band theory. We find that LaFe${}_2$As${}_2$ has a reduced bare bandwidth and this solves the apparent paradox of its sizeable correlations despite its nominal valence d${}^{6.5}$, which would imply extreme overdoping and uncorrelated behaviour in BaFe${}_2$As${}_2$. Our results yield a consistent picture of the whole 122 family and point at the importance of the correlation strength, rather than sheer doping, in the interpretation of the phase diagram of iron-based superconductors

arXiv comment5 pages, 4 figures

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Cited by in corpus (1)

• Experimental investigation of electronic interactions in collapsed and uncollapsed LaFe2As2 phases