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arxiv: 1001.3441 · v2 · submitted 2010-01-20 · ❄️ cond-mat.supr-con · cond-mat.str-el

Fermi surface and mass enhancement in KFe₂As₂ from de Haas-van Alphen effect measurements

Taichi Terashima , Motoi Kimata , Nobuyuki Kurita , Hidetaka Satsukawa , Atsushi Harada , Kaori Hazama , Motoharu Imai , Akira Sato
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Kunihiro Kihou Chul-Ho Lee Hijiri Kito Hiroshi Eisaki Akira Iyo Taku Saito Hideto Fukazawa Yoh Kohori Hisatomo Harima Shinya Uji
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classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords fermimassalphenelectronicenhancementhaas-vanmeasurementssurface
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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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