Low-energy interband transitions in the infrared response of Ba(Fe1-xCox)2As2
| Autor: | Marsik, P., Wang, C. N., Roessle, M., Yazdi-Rizi, M., Schuster, R., Kim, K. W., Dubroka, A., Munzar, D., Wolf, T., Chen, X. H., Bernhard, C. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 88, 180508(R) (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.88.180508 |
| Popis: | We studied the doping and temperature (T) dependence of the infrared (IR) response of Ba(Fe1-xCox)2As2 single crystals. We show that a weak band around 1000 cm-1, that was previously interpreted in terms of interaction of the charge carriers with magnetic excitations or of a pseudogap, is rather related to low-energy interband transitions. Specifically, we show that this band exhibits a similar doping and T-dependence as the hole pockets seen by angle resolved photoemission spectroscopy (ARPES). Notably, we find that it vanishes as a function of doping near the critical point where superconductivity is suppressed in the overdoped regime. Our IR data thus provide bulk specific information (complementary to the surface sensitive ARPES) for a Lifshitz transition. Our IR data also reveal a second low-energy band around 2300 cm-1 which further emphasizes the necessity to consider the multiband nature of these iron arsenides in the analysis of the optical response. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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