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

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

2010-01-20

arxiv.org/abs/1001.3441v2

J. Phys. Soc. Jpn. 79, 053702 (2010).

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1143/JPSJ.79.053702

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.

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