Fermi surface in KFe2As2 determined via de Haas-van Alphen oscillation measurements

Taichi Terashima, Nobuyuki Kurita, Motoi Kimata, Megumi Tomita, Satoshi Tsuchiya, 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

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We have completely determined the Fermi surface in KFe2As 2 via de Haas-van Alphen (dHvA) measurements. Fundamental frequencies ε, α, ζ, and β are observed in KFe2As 2. The first one is attributed to a hole cylinder near the X point of the Brillouin zone while the others to hole cylinders at the Γ point. We also observe magnetic breakdown frequencies between α and ζ and suggest a plausible explanation for them. The experimental frequencies show deviations from frequencies predicted by band-structure calculations. Large effective masses up to 19 me for Bâ̂¥c have been found, me being the free-electron mass. The carrier number and Sommerfeld coefficient of the specific heat are estimated to be 1.01-1.03 holes per formula unit and 82-94 mJmol-1 K-2, respectively, which are consistent with the chemical stoichiometry and a direct measure of 93 mJmol-1 K-2. The Sommerfeld coefficient is about nine times enhanced over a band value, suggesting the importance of low-energy spin and/or orbital fluctuations, and places KFe2As2 among strongly correlated metals. We have also performed dHvA measurements on Ba 0.07K0.93Fe2As2 and have observed the α and β frequencies.

Original languageEnglish
Article number224512
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
Publication statusPublished - 2013 Jun 27


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