Cyclotron resonance and mass enhancement by electron correlation in KFe2As2.
Cyclotron resonance and mass enhancement by electron correlation in KFe2As2.
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KFe2As2 中电子关联的回旋共振和质量增强。
DOI：
10.1103/physrevlett.107.166402
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发表时间：
2011
影响因子：
8.6
通讯作者：
S. Uji
中科院分区：
文献类型：
--
作者：
M. Kimata;T. Terashima;N. Kurita;H. Satsukawa;A. Harada;K. Kodama;K. Takehana;Y. Imanaka;T. Takamasu;K. Kihou;Chul;H. Kitô;H. Eisaki;A. Iyo;H. Fukazawa;Y. Kohori;H. Harima;S. Uji
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，并归因于r点处的二维α费米表面。我们发现CR的有效质量[（3.4±0.05）m（e）（m（e）为自由电子质量）]与de Haas-van Alphen的结果有很大的差异，这是电子关联导致质量增强的直接证据。比较CR和de Haas-van Alphen的结果表明，带内和带间电子关联对KFe（2）As（2）的质量增强都有贡献。
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).