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Angle-resolved photoemission spectroscopy study of rare-earth tritelluride charge density wave compounds: RTe3 (R = Pr, Er)
Electronic Structure ( IF 2.9 ) Pub Date : 2021-06-08 , DOI: 10.1088/2516-1075/abfeb1
Seungho Seong 1 , Eunsook Lee 1 , Y S Kwon 2 , B I Min 3 , J D Denlinger 4 , Byeong-Gyu Park 5 , J-S Kang 1
Affiliation  

The electronic structures of layered rare-earth tritelluride RTe3 (R = Pr, Er) charge density wave (CDW) compounds have been investigated by performing R 4d → 4f resonant photoemission spectroscopy (RPES) and angle-resolved photoemission spectroscopy (ARPES) measurements for high-quality single crystals. R 4d → 4f RPES measurements reveal that the R 4f states do not contribute directly to the CDW formation in RTe3 but that the R 4f-Te 5p hybridization in PrTe3 is significantly larger than that in ErTe3. In the photon-energy maps for the Fermi-edge (E F)-crossing states in RTe3, straight vertical dispersions are observed along k c , demonstrating the 2D character for the near-E F states in both R = Pr and Er. This finding implies the weak interlayer interaction between R-Te(1) and Te(2)–Te(3) layers, which is supported by the similar linear dichroism in ARPES for PrTe3 and ErTe3. The CDW-induced Fermi surface of PrTe3 exhibits two-fold symmetric features while that of ErTe3 exhibits four-fold symmetric features. This finding reveals different CDW distortions in PrTe3 and ErTe3, the origin of which is likely to be different ionic sizes of R ions and different R 4f-Te 5p hybridization.



中文翻译:

稀土碲化物电荷密度波化合物的角分辨光电子能谱研究:RTe3 (R = Pr, Er)

层状稀土碲化物R Te 3 ( R = Pr, Er) 电荷密度波 (CDW) 化合物的电子结构已通过执行R 4 d → 4 f共振光电子能谱 (RPES) 和角分辨光电子能谱进行了研究。 ARPES) 测量高质量单晶。R 4 d → 4 f RPES 测量表明,R 4 f状态不直接有助于R Te 3 中的 CDW 形成,但R 4 f -Te 5 pPrTe 3 中的杂交明显大于 ErTe 3。在光子能量为映射费米边缘(ê ˚F)在-crossing状态ř3,笔直的垂直分散体沿着观察ķ Ç,表明为所述近二维字符ê ˚F在两种状态- [R = Pr和二. 这一发现意味着R -Te(1) 和 Te(2)-Te(3) 层之间的层间相互作用较弱,这得到了 PrTe 3和 ErTe 3 ARPES 中类似线性二色性的支持。CDW 诱导的 PrTe 3费米面 表现出两倍对称特征,而 ErTe 3表现出四重对称特征。这一发现揭示了 PrTe 3和 ErTe 3 中不同的 CDW 畸变,其起源可能是不同的R离子离子尺寸和不同的R 4 f -Te 5 p杂化。

更新日期:2021-06-08
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