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  • Title: Cyclotron resonance and mass enhancement by electron correlation in KFe2As2.
    Author: Kimata M, Terashima T, Kurita N, Satsukawa H, Harada A, Kodama K, Takehana K, Imanaka Y, Takamasu T, Kihou K, Lee CH, Kito H, Eisaki H, Iyo A, Fukazawa H, Kohori Y, Harima H, Uji S.
    Journal: Phys Rev Lett; 2011 Oct 14; 107(16):166402. PubMed ID: 22107409.
    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).
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