We report on a band structure calculation and de Haas-van Alphen measurements of KFe₂As₂. Three cylindrical Fermi surfaces are found. Effective masses of electrons range from 6 to 18mₑ, mₑ being the free electron mass. Remarkable discrepancies between the calculated and observed Fermi surface areas and the large mass enhancement (3) highlight the importance of electronic correlations in determining the electronic structures of iron pnicitide superconductors.
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