title: Cyclotron resonance and mass enhancement by electron correlation in KFe2As2.
abstract: Cyclotron resonance (CR) measurements for the Fe-based superconductor KFe(2)As(2) are performed. One signal for CR is observed, and is attributed to the two-dimensional α Fermi surface at the Γ point. We found a large discrepancy in the effective masses of CR [(3.4±0.05)m(e) (m(e) is the free-electron mass)] and de Haas-van Alphen results, a direct evidence of mass enhancement due to electronic correlation. A comparison of the CR and de Haas-van Alphen results shows that both intra- and interband electronic correlations contribute to the mass enhancement in KFe(2)As(2).
authors: National Institute for Materials Science (NIMS), Ibaraki, Japan.
authors: Motoi
authors: M
authors: Kimata
authors: Taichi
authors: T
authors: Terashima
authors: Nobuyuki
authors: N
authors: Kurita
authors: Hidetaka
authors: H
authors: Satsukawa
authors: Atsushi
authors: A
authors: Harada
authors: Kouta
authors: K
authors: Kodama
authors: Kanji
authors: K
authors: Takehana
authors: Yasutaka
authors: Y
authors: Imanaka
authors: Tadashi
authors: T
authors: Takamasu
authors: Kunihiro
authors: K
authors: Kihou
authors: Chul-Ho
authors: CH
authors: Lee
authors: Hijiri
authors: H
authors: Kito
authors: Hiroshi
authors: H
authors: Eisaki
authors: Akira
authors: A
authors: Iyo
authors: Hideto
authors: H
authors: Fukazawa
authors: Yoh
authors: Y
authors: Kohori
authors: Hisatomo
authors: H
authors: Harima
authors: Shinya
authors: S
authors: Uji