Hidden robust presence of a hole Fermi surface in a heavily electron doped iron based superconductor LaFe${}_2$As${}_2$

Abstract

We investigate the electronic structure of a recently discovered, heavily electron-doped iron based superconductor LaFe${}_2$As${}_2$. Although first principles calculation shows apparent absence of hole Fermi surfaces around the $\Gamma$ point, we reveal, by hypothetically removing the La $d$ orbital contribution, that a hole Fermi surface around the $\Gamma$ point is essentially present. In the collapsed phase of LaFe${}_2$As${}_2$, which is non-superconducting, the hole Fermi surface is found to be absent, and the difference from the uncollapsed superconducting phase can be naturally understood within the spin-fluctuation mediated pairing scenario.

6 pages, 4 figures

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Cited by in corpus (6)

• Novel Fe-based superconductor LaFe2As2 in comparison with traditional pnictides
• Controlling T${}_c$ through band structure and correlation engineering in collapsed and uncollapsed phases of iron arsenides
• Data analysis of $ab$ $initio$ effective Hamiltonians in iron-based superconductors $\unicode{x2014}$ Construction of predictors for superconducting critical temperature
• Electronic Correlations and Absence of Superconductivity in the Collapsed Phase of LaFe${}_2$As${}_2$
• The uncollapsed LaFe2As2 phase: compensated, highly doped, electron-phonon coupled, iron-based superconductor
• Rationalizing doping and electronic correlations in LaFe${}_2$As${}_2$