Sulfur-induced magnetism in FeSe${}_{1-x}$S${}_x$ thin films on LaAlO${}_3$ revealed by muon spin rotation/relaxation

Abstract

Muon spin rotation/relaxation measurements were performed to investigate magnetic properties of FeSe${}_{1-x}$S${}_x$ thin films on LaAlO${}_3$. A drastic decrease of the initial asymmetry was observed together with the peak structure in the temperature dependence of the relaxation rate of muon spins almost at the same temperature where kink anomalies were observed in the temperature dependent resistivity. With increasing S content, the anomaly temperature increased and the magnetic fluctuations at the lowest temperature were suppressed. These results show that the S substitution induces magnetism at low temperatures in FeSe${}_{1-x}$S${}_x$ thin films. Although the behaviors of the magnetic and nematic phases in FeSe films towards chemical pressure by S substitution are similar to those for bulk FeSe towards hydrostatic pressure, the behavior of $T_{\mathrm{c}}$ is significantly different between these systems. Our results demonstrate that the detailed comparative investigation among physical and chemical pressure effects is essentially important to understand the interplay of the magnetism, the nematicity and the superconductivity in iron chalcogenides.

19 pages, 5 figures

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Cited by in corpus (5)

• Positive and negative chemical pressure effects investigated in electron-doped FeSe films with an electric-double-layer structure
• Relationships between Superconductivity and Nematicity in FeSe${}_{1-x}$Te${}_x$ ($x=0-0.5$) Films Studied by Complex Conductivity Measurements
• Evolution of lattice, spin, and charge properties across the phase diagram of FeSe${}_{1-x}$S${}_x$
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Evolution of charge dynamics in FeSe${}_{1-x}$Te${}_x$: Effects of electronic correlations and nematicity