[17p-Z20-1~13] 11.1 Fundamental properties

[17p-Z20-9] Observation of magnetic order in Fe(Se,S) thin films with high S concentration

〇Fuyuki Nabeshima¹, Yuma Kawai², Naoki Shikama¹, Yuki Sakishita¹, Andreas Suter³, Thomas Prokscha³, Sang Eun Park², Seiki Komiya⁴, Ataru Ichinose⁴, Tadashi Adachi², Atsutaka Maeda¹ (1.Univ. of Tokyo, 2.Sophia Univ., 3.PSI, 4.CRIEPI)

Keywords:iron-based superconductor, thin film, magnetism

Elucidation of relationship between superconductivity and magnetism is important to clarify the mechanism in iron chalcogenide superconductor, FeSe. While antiferromagnetism is observed in FeSe under hydrostatic pressure, there is no report on the magnetism in FeSe under chemical pressure by sulfur substitution. In this study, we performed the muon spin rotation/relaxation measurements for thin film samples of Fe(SeS) with high S content. 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. 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 Fe(Se,S) thin films.