论文标题
LASB2电子结构在13 K的电子结构和金属绝缘体过渡中的CDW签名
CDW signatures in the electronic structure of LaSb2 at 13 K and metal-insulator transition
论文作者
论文摘要
光稀有地球抗二氧化物lasb2是一种易感嵌套的材料，在355 K处表现出电荷密度波（CDW）以及低于1.2 K的超导性。在寻求其他CDW过渡时，我们研究了LASB2的温度依赖性在200和13 k和CDW的表现方面，并推断了CDW的表现，并推断了CDW的表现量，并推断了cdw的表现量表，并推断了cdw seption seption seption seption seption seption seption seption seption seption seption seption seption seption soppersist（均可量度偏移量）。 （DFT）计算。在200 K处的ARPES测量显示了金属系统，而它似乎在13 K处的半导体与现有的电阻率测量不一致。在13 K时，ARPES显示了内部费米表面口袋的带折叠，折叠带上具有相当大的光谱重量。我们在q = 0.25 $ \ pm $0.02Å-1时找到一个嵌套向量。此外，由于新的周期性开始，我们观察到其他频段的Umklapp，以及在整个相互空间中的半导体行为。计算表明折叠带与LA-SB层相关，并且平面内部失真是系统中最可能的结构修饰，可能会影响整个单位单元格。
Light rare-earth antimonide LaSb2 is a material susceptible to nesting and exhibits a Charge Density Wave (CDW) at 355 K as well as superconductivity below 1.2 K. In the seek for additional CDW transitions, we have studied the temperature-dependent of LaSb2 at 200 and 13 K and infer CDW manifestations by combining angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations. ARPES measurements at 200 K show a metallic system while it appears to be semiconducting at 13 K, at odds with existing resistivity measurements. At 13 K, ARPES shows the band folding of the inner Fermi surface pockets, with considerable spectral weight on the folded band. We find a nesting vector at q = 0.25$\pm$0.02 Å -1. In addition, we observe Umklapps of other bands due to the onset of the new periodicity, together with a semiconducting behavior in the whole reciprocal space. Calculations demonstrate that the folded band is associated with the La-Sb layer and that in-plane distortion is the most probable structural modification in the system, probably affecting the whole unit cell.
