Superconductivity-enhanced Nematicity and '$s+d$' Gap Symmetry in Fe(Se${}_{1-x}$S${}_x$)

Abstract

Superconducting iron chalcogenide FeSe has the simplest crystal structure among all the Fe-based superconductors. Unlike other iron pnictides, FeSe exhibits no long range magnetic order accompanying the tetragonal-to-orthorhombic structural distortion, which raises the fundamental question about the role of magnetism and its associated spin fluctuations in mediating both nematicity and superconductivity. The extreme sensitivity of FeSe to external pressure suggests that chemical pressure, induced by substitution of Se by the smaller ion S, could also a be good tuning parameter to further study the coupling between superconductivity and nematicity and to obtain information on both the Fermi-surface changes and the symmetry of the superconducting state. Here we study the thermodynamic properties of Fe(Se${}_{1-x}$S${}_x$) for 3 compositions, $x=0$, 0.08 and 0.15, using heat-capacity and thermal-expansion measurements. With increasing S content we observe a significant reduction of the tetragonal-to-orthorhombic transition temperature T${}_s$. However, this suppression of T${}_s$ is counterintuitively accompanied by an enhancement of the orthorhombic distortion $\delta$ below T${}_c$, which clearly indicates that superconductivity favors the nematic state. In parallel, the superconducting transition temperature T${}_c$ is sizeably enhanced, whereas the increase of the Sommerfeld coefficient ${\gamma }_n$ is quite moderate. In the T$\to$ 0 limit, an unusually large residual density of states is found for $x>0$ indicative of significant substitution-induced disorder. We discuss these observations in the context of $s+d$ superconducting-state symmetry.

7 pages, 3 figures - Ref 23 corrected

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• Superconducting gap structure of FeSe
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Evidence for short-range magnetic order in the nematic phase of FeSe from anisotropic in-plane magnetostriction and susceptibility measurements
• Time-reversal symmetry-breaking nematic superconductivity in FeSe
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• Electronic structure of FeS
• Superconductivity Mediated by Nematic Fluctuations in Tetragonal $\text{Fe}{\text{Se}}_{1-x}{\text{S}}_x$
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• Nonlinear uniaxial pressure dependence of $T_c$ in iron-based superconductors
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• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
• Suppression of nematicity by tensile strain in multilayer FeSe/SrTiO${}_3$ films
• Nodeless multigap superconductivity in organic-ion-intercalated (tetrabutyl~ammonium)${}_{0.3}$FeSe