Angle-resolved photoemission study of quasi one-dimensional TlInSe₂

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• 作者：Kojiro Mimura ; Kazuki Wakita ; Masashi Arita ; Nazim Mamedov ; Guseyn Orudzhev ; Yukihiro Taguchi ; Kouichi Ichikawa ; Hirofumi Namatame ; Masaki Taniguchi
• 关键词：TlInSe₂ ; One-dimensional material ; Incommensurate superlattice phase ; Angle-resolved photoemission spectroscopy
• 刊名：Journal of Electron Spectroscopy and Related Phenomena
• 出版年：2007
• 出版时间：May 2007
• 年：2007
• 卷：156-158
• 期：Complete
• 页码：379-382
• 全文大小：660 K

文摘

TlInSe₂ with a quasi one-dimensional chain structure and a giant Seebeck coefficient of more than 10⁶ μV/K below 140 °C has been investigated by means of angle-resolved photoemission spectroscopy at 50 K and 280 K. The obtained energy bands favorably agree with the calculated band structure and show quite noticeable dispersion in the direction normal to the chains. A rigid shift toward lower binding energies, a splitting and the formation of the mini-gap-like structures are clearly observed in the experimental electronic bands with the temperature reduced to 50 K. These features are indicative of an incommensurate superlattice phase emerging in TlInSe₂ with temperature, and causing the record-breaking values of Seebeck coefficient.