Angle-resolved photoemission spectroscopy study of rare-earth tritelluride charge density wave compounds: RTe3 (R= Pr, Er). (7th June 2021)

• Record Type: Journal Article
• Authors: Seong, Seungho; Lee, Eunsook; Kwon, Y S; Min, B I; Denlinger, J D; Park, Byeong-Gyu; Kang, J-S
• Is Part Of: Electronic structure. Volume 3:Number 2(2021)
• Publication Date: 2021-06-07
• Subjects: charge density wave -- angle-resolved photoemission spectroscopy -- electronic structure -- resonant photoemission spectroscopy -- hybridization; Electronic structure -- Periodicals; 530.411
• DOI: 10.1088/2516-1075/abfeb1
• Languages: English
• ISSNs: 2516-1075

Abstract

Abstract: The electronic structures of layered rare-earth tritelluride R Te3 ( R = Pr, Er) charge density wave (CDW) compounds have been investigated by performing R 4 d → 4 f resonant photoemission spectroscopy (RPES) and angle-resolved photoemission spectroscopy (ARPES) measurements for high-quality single crystals. R 4 d → 4 f RPES measurements reveal that the R 4 f states do not contribute directly to the CDW formation in R Te3 but that the R 4 f -Te 5 p hybridization in PrTe3 is significantly larger than that in ErTe3 . In the photon-energy maps for the Fermi-edge ( E F )-crossing states in R Te3, 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 4 f -Te 5 p hybridization.