Electronic Scattering Effects in Europium-Based Iron Pnictides

Abstract

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.

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• Iron-based superconductivity extended to the novel silicide LaFeSiH
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• Reentrant phases in electron-doped ${\text{EuFe}}_2{\text{As}}_2$: spin glass and superconductivity
• Iron-based superconductors: Foreword