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

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

2011-11-08

arxiv.org/abs/1111.1884v1

Phys. Rev. Lett. 107, 166402 (2011)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

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 $\alpha$ Fermi surface at the $\Gamma$ 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$_2$.

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