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arXiv 1406.4166cond-mat.str-elcond-mat.supr-con
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强关联Fe $_{1.03}$ Te中的谱权转移

Spectral weight transfer in strongly correlated Fe$_{1.03}$Te

Y. M. Dai, A. Akrap, J. Schneeloch, R. D. Zhong, T. S. Liu, G. D. Gu, Q. Li, C. C. Homes

摘要:

在$T_N\simeq 68$ K温度下,测定了Fe $_{1.03}$ Te在磁转变和结构转变前后的面内电导率随温度的变化关系.电子和空穴袋被视为两个独立的电子子系统;强、宽的德鲁德响应在很大程度上与温度无关,而弱得多、窄的德鲁德响应具有很强的温度依赖性。光谱权重从高频转移到低于$T_N$的低频,导致低频电导率和相关等离子体频率的急剧增加。等离子体频率的变化是由于电子袋上赝能隙的关闭导致载流子浓度的增加,以及反铁磁状态下有效质量的可能降低。

英文摘要:

The temperature dependence of the in-plane optical conductivity has been determined for Fe$_{1.03}$Te above and below the magnetic and structural transition at $T_N\simeq 68$ K. The electron and hole pockets are treated as two separate electronic subsystems; a strong, broad Drude response that is largely temperature independent, and a much weaker, narrow Drude response with a strong temperature dependence. Spectral weight is transferred from high to low frequency below $T_N$, resulting in the dramatic increase of both the low-frequency conductivity and the related plasma frequency. The change in the plasma frequency is due to an increase in the carrier concentration resulting from the closing of the pseudogap on the electron pocket, as well as the likely decrease of the effective mass in the antiferromagnetic state.

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