论文标题
拉曼研究库珀配对不稳定性（li $ _ {1-x} $ fe $ _x $）ohfese
Raman Study of Cooper Pairing Instabilities in (Li$_{1-x}$Fe$_x$)OHFeSe
论文作者
论文摘要
我们研究了（li $ _ {1-x} $ fe $ _x $）OHFESE的电子拉曼光谱作为光和温度的函数。仅在b $ _ {1g} $光谱中，我们就会观察到超导体预期的光谱重量的重新分布和两个低于t $ _c $的峰值峰。在110 cm $^{ - 1} $（13.6 MEV）处的几乎分辨率有限的峰标识为集体模式。 190 cm $^{ - 1} $（23.6 meV）处的峰值可能是另一个集体模式，因为该线是对称的，并且其能量显着低于单粒子光谱镜观察到的间隙能量。鉴于（li $ _ {1-x} $ fe $ _x $）OHFESE的实验带结构，最合理的解释包括电子带和初始孔带之间的常规自旋 - 透射配对以及杂交电子带之间的配对。在$ _ {1G} $和B $ _ {2G} $对称性中缺乏间隙功能，有利于第二种情况。因此，尽管PNICTIDES和CHALCOPONIDE之间存在各种差异，但该字母证明了配对状态的接近度以及在基于Fe的化合物中带结构效应的重要性。
We studied the electronic Raman spectra of (Li$_{1-x}$Fe$_x$)OHFeSe as a function of light polarization and temperature. In the B$_{1g}$ spectra alone we observe the redistribution of spectral weight expected for a superconductor and two well-resolved peaks below T$_c$. The nearly resolution-limited peak at 110 cm$^{-1}$ (13.6 meV) is identified as a collective mode. The peak at 190 cm$^{-1}$ (23.6 meV) is presumably another collective mode since the line is symmetric and its energy is significantly below the gap energy observed by single-particle spectroscopies. Given the experimental band structure of (Li$_{1-x}$Fe$_x$)OHFeSe, the most plausible explanations include conventional spin-fluctuation pairing between the electron bands and the incipient hole band and pairing between the hybridized electron bands. The absence of gap features in A$_{1g}$ and B$_{2g}$ symmetry favors the second case. Thus, in spite of various differences between the pnictides and chalcogenides, this Letter demonstrates the proximity of pairing states and the importance of band structure effects in the Fe-based compounds.
