Band structure and Fermi surfaces of the reentrant ferromagnetic superconductor Eu(Fe0.86Ir0.14)2As2

Abstract

The electronic structure of the reentrant superconductor Eu(Fe${}_{0.86}$Ir${}_{0.14}$)${}_2$As${}_2$ (T${}_c$ = 22 K) with coexisting ferromagnetic order (T${}_M$ = 18 K) is investigated using angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy (STS). We study the in-plane and out-of-plane band dispersions and Fermi surface (FS) of Eu(Fe${}_{0.86}$Ir${}_{0.14}$)${}_2$As${}_2$. The near E${}_F$ Fe 3d-derived band dispersions near the $\Gamma$ and X high-symmetry points show changes due to Ir substitution, but the FS topology is preserved. From momentum dependent measurements of the superconducting gap measured at T = 5 K, we estimate an essentially isotropic s-wave gap ($\Delta \sim 5.25\pm 0.25$ meV), indicative of strong-coupling superconductivity with 2$\Delta$/k${}_B$T${}_c\simeq$ 5.8. The gap gets closed at temperatures T $\ge$ 10 K, and this is attributed to the resistive phase which sets in at T${}_M$ = 18 K due to the Eu${}^{2+}$-derived magnetic order. The modifications of the FS with Ir substitution clearly indicates an effective hole doping with respect to the parent compound.

arXiv comment6 pages, 5 figures

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