KFe $_2$ As $_2$的回旋共振和电子关联质量增强
Cyclotron resonance and mass enhancement by electron correlation in KFe$_2$As$_2$
摘要：
对铁基超导体KFe $_2$ As $_2$进行了回旋共振（CR）测量。观察到CR的一个信号，并且归因于在$Γ$点处的二维$α$费米表面。我们发现CR的有效质量[（3.4 $\pm$ 0.05）$m_e$（$m_e$是自由电子质量）]和de-Haas van Alphen（dHvA）结果存在很大差异，这是由于电子相关导致质量增强的直接证据。CR和dHvA结果的比较表明，带内和带间电子相关有助于在KFe $_2$ As $_2$的质量增强。
英文摘要：
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$_2$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
