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Cyclotron resonance and mass enhancement by electron correlation in KFe$_2$As$_2$

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 (dHvA) results, a direct evidence of mass enhancement due to electronic correlation. A comparison of the CR and dHvA results shows that both intra- and interband electronic correlations contribute to the mass enhancement in KFe$_2$As$_2$.

preprint2011arXivOpen access
Motoi KimataTaichi TerashimaNobuyuki KuritaHidetaka SatsukawaAtsushi HaradaKouta KodamaKanji TakehanaYasutaka ImanakaTadashi TakamasuKunihiro KihouChul-Ho LeeHijiri KitoHiroshi EisakiAkira IyoHideto FukazawaYoh KohoriHisatomo HarimaShinya Uji
cond-mat.supr-concond-mat.mtrl-sci
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Open access18 authors2 topics
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Motoi KimataTaichi TerashimaNobuyuki KuritaHidetaka SatsukawaAtsushi HaradaKouta KodamaKanji TakehanaYasutaka ImanakaTadashi TakamasuKunihiro KihouChul-Ho LeeHijiri KitoHiroshi EisakiAkira IyoHideto FukazawaYoh KohoriHisatomo HarimaShinya Uji

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