标题： LiFeAs中长波长向列涨落的缺失 显示英文标题

标题： Absence of long wavelength nematic fluctuations in LiFeAs

摘要： 我们通过非弹性中子散射测量了温度依赖的声学声子重整化，研究了铁基超导体LiFeAs在q=(0.05,0,0)附近的长波长向列相涨落。 我们发现声子表现出常规行为，这与没有电子向列相涨落的情况预期一致。 这一观察结果意味着电子-声子耦合可能太弱而无法观察到任何效应，或者向列相涨落并不存在。 显示英文摘要

摘要： We investigated long-wavelength nematic fluctuations in an Fe-based superconductor LiFeAs near q=(0.05,0,0) by measuring temperature-dependent renormalization of acoustic phonons through inelastic neutron scattering. We found that the phonons have conventional behavior, as would be expected in the absence of electronic nematic fluctuations. This observation implies that either electron-phonon coupling is too weak to see any effect or that nematic fluctuations are not present.