Nematic Fluctuations in Optimally Doped BaFe1.87Co0.13As2 Observed in Photoinduced Reflectivity Change,Physica Status Solidi-Rapid Research Letters

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Nematic Fluctuations in Optimally Doped BaFe1.87Co0.13As2 Observed in Photoinduced Reflectivity Change
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-01-03 , DOI: 10.1002/pssr.201900584
YeongSeon Lee ₁ , Inho Kwak _{2,

3} , Min-Cheol Lee _{2,

3} , Choongwon Seo ₁ , Youngchan Kim _{1,

4} , Thomas Wolf ₅ , TaeWon Noh _{2,

3} , KyungWan Kim ₁

Affiliation

The photoinduced reflectivity change of optimally doped BaFe_1.87Co_0.13As₂ is investigated. It is observed that the nematic signal in the photoinduced reflectivity change continues to increase as temperature decreases, reflecting its fluctuating nature. However, fluence‐dependent measurements show saturation of the nematic signal at higher pump fluence, a typical behavior of a static order parameter. Temperature‐dependent evolution of the saturation and the characteristic relaxation time of the nematic signal suggest that the nematicity of a spin and/or orbital origin develops at lower temperature on top of the nematicity coupled to the lattice that dominates the higher temperature nematic response.

中文翻译：

在光致反射率变化中观察到最佳掺杂的BaFe1.87Co0.13As2的向列波动。

研究了最佳掺杂的BaFe _1.87 Co _0.13 As ₂的光致反射率变化。观察到，随着温度降低，光诱导反射率变化中的向列信号继续增加，反映了其波动性。但是，取决于注量的测量结果表明，在较高泵注量下，向列信号饱和，这是静态阶数参数的典型行为。随温度变化的饱和度和向列信号的特征弛豫时间表明，自旋和/或轨道起源的向列性在较低的温度下发展，而向列性耦合于主导较高温度向列响应的晶格。

更新日期：2020-01-03

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