稀土三碲化物电子输运中各向同性自发破缺现象的研究
Spontaneous breaking of isotropy observed in the electronic transport of rare-earth tritellurides
摘要：
研究表明，在Peierls转变温度以下，稀土三碲化物RTe_3化合物正常态的各向同性导电性被（a，c）平面上的单向电荷密度波（CDW）破坏。与准一维系统相比，与CDW转变相关的电阻率异常在垂直于CDW波矢量Q的方向（a轴）上很强，而在CDW波矢量Q方向（c轴）上很弱。我们定性地解释了这一结果，通过计算的电子色散与动量相关的CDW间隙确定的角分辨光电子能谱（ARPES）的电导率。
英文摘要：
We show that the isotropic conductivity in the normal state of rare-earth tritelluride RTe_3 compounds is broken by the occurrence of the unidirectional charge density wave (CDW) in the (a,c) plane below the Peierls transition temperature. In contrast with quasi-one-dimensional systems, the resistivity anomaly associated with the CDW transition is strong in the direction perpendicular to the CDW wave vector Q (a-axis) and very weak in the CDW wave vector Q direction (c-axis). We qualitatively explain this result by calculating the electrical conductivity for the electron dispersion with momentum-dependent CDW gap as determined by angle-resolved photoemission spectroscopy (ARPES).
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