Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe$_\mathrm{1\text{-}x}$S$_\mathrm{x}$

S. Holenstein; J. Stahl; Z. Shermadini; G. Simutis; V. Grinenko; D. A. Chareev; R. Khasanov; J. -C. Orain; A. Amato; H. -H. Klauss; E. Morenzoni; D. Johrendt; H. Luetkens

doi:10.1103/physrevlett.123.147001

arXiv · 1905.07164

Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe$_\mathrm{1\text{-}x}$S$_\mathrm{x}$

S. Holenstein·J. Stahl·Z. Shermadini·G. Simutis·V. Grinenko·D. A. Chareev·R. Khasanov·J. -C. Orain·A. Amato·H. -H. Klauss·E. Morenzoni·D. Johrendt·H. Luetkens

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Abstract

We report muon spin rotation ($\mu$SR) and magnetization measurements under pressure on Fe$_{1+\delta}$Se$_\mathrm{1\text{-}x}$S$_\mathrm{x}$ with x $\approx 0.11$.Above $p\approx0.6$ GPa we find microscopic coexistence of superconductivity with an extended dome of long range magnetic order that spans a pressure range between previously reported separated magnetic phases. The magnetism initially competes on an atomic scale with the coexisting superconductivity leading to a local maximum and minimum of the superconducting $T_\mathrm{c}(p)$. The maximum of $T_\mathrm{c}$ corresponds to the onset of magnetism while the minimum coincides with the pressure of strongest competition. A shift of the maximum of $T_\mathrm{c}(p)$ for a series of single crystals with x up to 0.14 roughly extrapolates to a putative magnetic and superconducting state at ambient pressure for x $\geq0.2$.

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S. Holenstein, J. Stahl, Z. Shermadini, G. Simutis, V. Grinenko, D. A. Chareev, R. Khasanov, J. -C. Orain, A. Amato, H. -H. Klauss, E. Morenzoni, D. Johrendt, H. Luetkens. 2019-05-17. Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe$_\mathrm{1\text{-}x}$S$_\mathrm{x}$. https://doi.org/10.1103/physrevlett.123.147001

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