Cyclotron Resonance and Mass Enhancement by Electron Correlation in ${\mathrm{KFe}}_{2}{\mathrm{As}}_{2}$

Cyclotron Resonance and Mass Enhancement by Electron Correlation in ${KFe}_{2} {As}_{2}$

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, and Shinya Uji

Phys. Rev. Lett. 107, 166402 – Published 12 October 2011

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 [ $(3.4 \pm 0.05) m_{e}$ ( $m_{e}$ 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 ${KFe}_{2} {As}_{2}$ .

Received 17 June 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.166402

Authors & Affiliations

Motoi Kimata^1,2,†, Taichi Terashima^1,2, Nobuyuki Kurita^1,2, Hidetaka Satsukawa¹, Atsushi Harada¹, Kouta Kodama^1,*, Kanji Takehana¹, Yasutaka Imanaka¹, Tadashi Takamasu¹, Kunihiro Kihou^2,3, Chul-Ho Lee^2,3, Hijiri Kito^2,3, Hiroshi Eisaki^2,3, Akira Iyo^2,3, Hideto Fukazawa^2,4, Yoh Kohori^2,4, Hisatomo Harima^2,5, and Shinya Uji^1,2,*

¹National Institute for Materials Science (NIMS), Ibaraki 305-0003, Japan
²JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo 102-0075, Japan
³National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki 305-8568, Japan
⁴Department of Physics, Chiba University, Chiba 263-8522, Japan
⁵Department of Physics, Graduate School of Science, Kobe University, Hyogo 657-8501, Japan

^*Also at the Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan.
^†Present address: Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

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Vol. 107, Iss. 16 — 14 October 2011

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Physical Review Letters

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, and Shinya Uji

Phys. Rev. Lett. 107, 166402 – Published 12 October 2011

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Cyclotron Resonance and Mass Enhancement by Electron Correlation in ${KFe}_{2} {As}_{2}$