Cyclotron resonance in Fe-based superconductor KFe2As 2

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

Research output: Contribution to journalConference articlepeer-review


We report cyclotron resonance (CR) measurements for the Fe-based superconductor KFe2As2. Only one series of CR with an effective mass of 3.4me (me is the free electron mass) is observed. The CR signal is attributed to the quasi-two-dimensional α Fermi surface at the Γ point. Our main finding is that the effective mass obtained from the CR is significantly smaller than that obtained from the de-Haas van Alphen (dHvA) measurements. This is the direct evidence of the mass enhancement by electronic correlation. A comparison between the CR and dHvA measurements shows that both intra- and interband electronic correlations contribute to the mass enhancement in KFe2As2.

Original languageEnglish
Article number022054
JournalJournal of Physics: Conference Series
Issue numberPART 2
Publication statusPublished - 2012
Externally publishedYes
Event26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China
Duration: 2011 Aug 102011 Aug 17

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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