Self-energy effects and electron-phonon coupling in Fe-As superconductors
- Authors
- Choi, K-Y; Lemmens, P.; Eremin, I.; Zwicknagl, G.; Berger, H.; Sun, G. L.; Sun, D. L.; Lin, C. T.
- Issue Date
- Mar-2010
- Publisher
- IOP PUBLISHING LTD
- Citation
- JOURNAL OF PHYSICS-CONDENSED MATTER, v.22, no.11
- Journal Title
- JOURNAL OF PHYSICS-CONDENSED MATTER
- Volume
- 22
- Number
- 11
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/22560
- DOI
- 10.1088/0953-8984/22/11/115802
- ISSN
- 0953-8984
- Abstract
- Doping and temperature dependent studies of optical phonon modes in Fe-122 pnictides are performed using Raman scattering experiments and compared with model calculations to elucidate the role of electron-phonon and spin-phonon interaction in this family of compounds. The frequency and linewidth of the B(1g) mode at around 210 cm(-1) is highlighted as appreciable anomalies at the superconducting and spin density wave transitions are observed that strongly depend on composition. We give estimates of the electron-phonon coupling related to this renormalization and calculate the phonon self-energy on the basis of a four-band model comparing different symmetries of the order parameters. In addition, we observe a pronounced quasi-elastic Raman response for the undoped compound, suggesting persisting magnetic fluctuations in the spin density wave state.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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