| Autor: |
Zapf, S., Neubauer, D., Post, K. W., Kadau, A., Merz, J., Clauss, C., Löhle, A., Jeevan, H. S., Gegenwart, P., Basov, D. N., Dressel, M. |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Comptes Rendus Physique 17, 188 (2016) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1016/j.crhy.2015.04.008 |
| Popis: |
In a comprehensive study, we investigate the electronic scattering effects in EuFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ by using Fourier-transform infrared spectroscopy. In spite of the fact that Eu$^{2+}$ local moments order around $T_\text{Eu} \approx 20$\,K, the overall optical response is strikingly similar to the one of the well-known Ba-122 pnictides. The main difference lies within the suppression of the lower spin-density-wave gap feature. By analysing our spectra with a multi-component model, we find that the high-energy feature around 0.7\,eV -- often associated with Hund's rule coupling -- is highly sensitive to the spin-density-wave ordering, this further confirms its direct relationship to the dynamics of itinerant carriers. The same model is also used to investigate the in-plane anisotropy of magnetically detwinned EuFe$_{2}$As$_{2}$ in the antiferromagnetically ordered state, yielding a higher Drude weight and lower scattering rate along the crystallographic $a$-axis. Finally, we analyse the development of the room temperature spectra with isovalent phosphor substitution and highlight changes in the scattering rate of hole-like carriers induced by a Lifshitz transition. |
| Databáze: |
arXiv |
| Externí odkaz: |
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