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

preprint2010arXivOpen access

Taichi Terashima Motoi Kimata Nobuyuki Kurita Hidetaka Satsukawa Atsushi Harada Kaori Hazama Motoharu Imai Akira Sato Kunihiro Kihou Chul-Ho Lee Hijiri Kito Hiroshi Eisaki Akira Iyo Taku Saito Hideto Fukazawa Yoh Kohori Hisatomo Harima Shinya Uji

cond-mat.supr-con cond-mat.str-el

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

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