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Dome of magnetic order inside the nematic phase of sulfur-substituted FeSe under pressure

TitleDome of magnetic order inside the nematic phase of sulfur-substituted FeSe under pressure
Publication TypeJournal Article
Year of Publication2017
AuthorsXiang, L, Kaluarachchi, US, Bohmer, AE, Taufour, V, Tanatar, MA, Prozorov, R, Bud'ko, SL, Canfield, PC
JournalPhysical Review B
Date Published07
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000405698000007
Keywordshigh-temperature superconductivity, physics

The pressure dependence of the structural, magnetic, and superconducting transitions and of the superconducting upper critical field were studied in sulfur-substituted Fe(Se1-x S-x). Resistance measurements were performed on single crystals with three substitution levels (x = 0.043, 0.096, 0.12) under hydrostatic pressures up to 1.8 GPa and in magnetic fields up to 9 T and were compared to data on pure FeSe. Our results illustrate the effects of chemical and physical pressure on Fe(Se1-x S-x). On increasing sulfur content, magnetic order in the low-pressure range is strongly suppressed to a small domelike region in the phase diagrams. However, T-s is much less suppressed by sulfur substitution, and T-c of Fe(Se1-x S-x) exhibits similar nonmonotonic pressure dependence with a local maximum and a local minimum present in the low-pressure range for all x. The local maximum in T-c coincides with the emergence of the magnetic order above T-c. At this pressure the slope of the upper critical field decreases abruptly, which may indicate a Fermi-surface reconstruction. The minimum of Tc correlates with a broad maximum of the upper critical field slope normalized by T-c.

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