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arXiv 1409.4701cond-mat.supr-con
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$\mathrm{Ba_2Ti_2Fe_2As_4O}$中超导性与密度波共存的光谱研究

Coexistence of superconductivity and density wave in $\mathrm{Ba_2Ti_2Fe_2As_4O}$: an optical spectroscopy study

H. P. Wang, Y. L. Sun, X. B. Wang, Y. Huang, T. Dong, R. Y. Chen, G. H. Cao, N. L. Wang

摘要:

我们对$\mathrm{Ba_2Ti_2Fe_2As_4O}$单晶进行了光谱测量,这是一种新发现的超导体,显示超导性和密度波序共存。该研究揭示了一个光谱变化有关的形成密度波能隙低于$T_{DW}\approx$ 125 K,导致去除约一半的多个费米面片。2 $Δ_{DW}$ / $k_B T_{DW}\approx$ 11.9的比值比基于弱耦合BCS理论的平均场值大得多。在超导态的最低温度下,我们观察到超导能隙$Δ_1(0) =3.4$ meV和$Δ_2(0)=7.9$ meV的打开。$\mathrm{Ba_2Ti_2Fe_2As_4O}$中超导态的性质与$\mathrm{BaFe_{1.85}Co_{0.15}As_2}$中超导态的性质相似。

英文摘要:

We performed an optical spectroscopy measurement on single crystals of $\mathrm{Ba_2Ti_2Fe_2As_4O}$, which is a newly discovered superconductor showing a coexistence of superconductivity and density wave order. The study reveals a spectral change related to the formation density wave energy gap below $T_{DW}\approx$125 K, leading to the removal of about half of the multiple Fermi surface sheets. The ratio of 2$Δ_{DW}$/$k_B T_{DW}\approx$ 11.9 is considerably larger than the mean-field value based on the weak-coupling BCS theory. At the lowest temperature in the superconducting state, we observed opening of superconducting energy gaps $Δ_1(0) =3.4$ meV and $Δ_2(0)=7.9$ meV. The properties of superconducting state in $\mathrm{Ba_2Ti_2Fe_2As_4O}$ are similar to that in $\mathrm{BaFe_{1.85}Co_{0.15}As_2}$.

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