Fermi surface and mass enhancement in KFe${}_2$As${}_2$ from de Haas-van Alphen effect measurements

Abstract

We report on a band structure calculation and de Haas-van Alphen measurements of KFe${}_2$As${}_2$. Three cylindrical Fermi surfaces are found. Effective masses of electrons range from 6 to 18$m_e$, $m_e$ being the free electron mass. Remarkable discrepancies between the calculated and observed Fermi surface areas and the large mass enhancement ($\gtrsim 3$) highlight the importance of electronic correlations in determining the electronic structures of iron pnicitide superconductors.

5 pages, 4 figures, after minor revision, accepted for publication in J. Phys. Soc. Jpn.

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• Ab initio Evidence for Strong Correlation Associated with Mott Proximity in Iron-based Superconductors
• Hundness versus Mottness in a three-band Hubbard-Hund model: On the origin of strong correlations in Hund metals
• Quantum oscillation studies of the Fermi surface of iron-pnictide superconductors
• Strong Correlations, Strong Coupling and s-wave Superconductivity in Hole-doped BaFe2As2 Single Crystals
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