Non-Fermi-liquid scattering rates and anomalous band dispersion in ferropnictides
| Autor: | Fink, J., Charnukha, A., Rienks, E. D. L., Liu, Z. H., Thirupathaiah, S., Avigo, I., Roth, F., Jeevan, H. S., Gegenwart, P., Roslova, M., Morozov, I., Wurmehl, S., Bovensiepen, U., Borisenko, S., Vojta, M., Buechner, B. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 92. 201106 (R) (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.92.201106 |
| Popis: | Angle-resolved photoemission spectroscopy (ARPES) is used to study the band dispersion and the quasiparticle scattering rates in two ferropnictides systems. Our ARPES results show linear-in-energy dependent scattering rates which are constant in a wide range of control parameter and which depend on the orbital character of the bands. We demonstrate that the linear energy dependence gives rise to weakly dispersing band with a strong mass enhancement when the band maximum crosses the chemical potential. In the superconducting phase the related small effective Fermi energy favors a Bardeen-Cooper-Schrieffer (BCS)\,\cite{Bardeen1957}-Bose-Einstein (BE)\,\cite{Bose1924} crossover state. Comment: 5 pages, 4 figures Supplement 4 pages, 6 figures |
| Databáze: | arXiv |
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