Cyclotron resonance and mass enhancement by electron correlation in KFe2As2

Motoi Kimata, Taichi Terashima, Nobuyuki Kurita, Hidetaka Satsukawa, Atsushi Harada, Kouta Kodama, Kanji Takehana, Yasutaka Imanaka, Tadashi Takamasu, Kunihiro Kihou, Chul Ho Lee, Hijiri Kito, Hiroshi Eisaki, Akira Iyo, Hideto Fukazawa, Yoh Kohori, Hisatomo Harima, Shinya Uji

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Cyclotron resonance (CR) measurements for the Fe-based superconductor KFe2As2 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) me (me 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 2As2.

Original languageEnglish
Article number166402
JournalPhysical review letters
Issue number16
Publication statusPublished - 2011 Oct 12
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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