Electronic structures of RTe2 (R=La,Ce): A clue to the pressure-induced superconductivity in CeTe1.82
SCIE
SCOPUS
- Title
- Electronic structures of RTe2 (R=La,Ce): A clue to the pressure-induced superconductivity in CeTe1.82
- Authors
- Shim, JH; Kang, JS; Min, BI
- Date Issued
- 2004-10-08
- Publisher
- AMERICAN PHYSICAL SOC
- Abstract
- Electronic structures of RTe2 (R=La,Ce) have been investigated by using the local spin density approximation (LSDA) and the LSDA+U (U: on-site Coulomb interaction) band methods. Both LaTe2 and CeTe2 show the very similar Fermi surface nesting features along the [100] direction, which drive the charge-density wave (CDW) instability in the Te(1) sheets. The contribution near E-F from Ce 4f states is negligible in agreement with the measured ARPES spectra. In the semimetallic CDW-distorted RTe2, both Te vacancy and pressure induce the charge transfer from Te(1) 5p to R 5d states, producing the enhanced density of states at E-F. We suggest that these increased self-doped Te(1) 5p hole carriers are responsible for the pressure-induced superconductivity in nonstoichiometric CeTe1.82.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12426
- DOI
- 10.1103/PhysRevLett.93.156406
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- PHYSICAL REVIEW LETTERS, vol. 93, no. 15, 2004-10-08
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