论文标题
cecoin5的动量空间中伴有近晶体连贯性的各向异性
Anisotropy of Kondo-lattice coherence in momentum space for CeCoIn5
论文作者
论文摘要
我们通过极化分辨的拉曼光谱法研究了重毛金属cecoin $ _5 $的电子和语音激发，以探索近野晶状体相干性。在相干温度T*\，= \，45 \，K下方，XY散射几何形状中电子激发的连续性在低于50 \，CM $^{ - 1} $的频率下被抑制，而X'y'seemetry在t的频率均没有变化。我们将抑制与相干效应引起的电子电子散射速率降低相关。 XY几何形状中存在抑制作用及其在X'y''''的几何形状中的不存在，都意味着$α$和$β$频段在T*以下相干，而$γ$ band的频段在很大程度上保持不相差至10 \ k。此外，两个光学声子模式在其频率和线宽以下的温度依赖性下表现出异常，这是由于在费米水平附近发展相干的光谱重量和降低的电子 - 音波散射速率而导致的。我们的结果进一步支持Cecoin $ _5 $中各向异性杂交的关键作用。
We study the electronic and phononic excitations of heavy-fermion metal CeCoIn$_5$ by polarization-resolved Raman spectroscopy to explore the Kondo-lattice coherence. Below the coherence temperature T*\,=\,45\,K, the continuum of electronic excitations in the XY scattering geometry is suppressed at frequencies below 50\,cm$^{-1}$, whereas the low-frequency continuum in the X'Y' geometry exhibits no change across T*. We relate the suppression to the reduced electron-electron scattering rate resulting from the coherence effect. The presence of suppression in the XY geometry and absence of it in the X'Y' geometry implies that the $α$ and $β$ bands become coherent below T*, whereas the $γ$ band remains largely incoherent down to 10\,K. Moreover, two optical phonon modes exhibit anomalies in their temperature dependence of the frequency and linewidth below T*, which results from developing coherent spectral weight near the Fermi level and reduced electron-phonon scattering rate. Our results further support the key role of anisotropic hybridization in CeCoIn$_5$.
