Crossover of Superconductivity across the antiferromagnetic end point in FeSe$_{\rm 1-x}$S$_{\rm x}$ under pressure

Kiyotaka Miyoshi; Takanobu Nakatani; Yumi Yamamoto; Takumi Maeda; Daichi Izuhara; Ikumi Matsushima

doi:10.1103/lxzc-l3md

paper

Crossover of Superconductivity across the antiferromagnetic end point in FeSe $_{1 - x}$ S $_{x}$ under pressure

arXiv:2505.04156 · doi:10.1103/lxzc-l3md

Abstract

Temperature-pressure ( $T$ - $P$ ) phase diagrams of FeSe $_{1 - x}$ S $_{x}$ were investigated by the measurements of dc magnetization ( $M$ ) and electrical resistivity ( $ρ$ ) under pressure, using single crystal specimens with $x$ =0.04, 0.08 and 0.13. For all specimens, the $M$ ( $T$ ) curves under pressure near the end point of the antiferromagnetic (AFM) phase are found to show a two-step diamagnetic response, which can be described as the sum of two diamagnetic components $M_{1}$ ( $T$ ) and $M_{2}$ ( $T$ ), indicating that two superconducting (SC) phases with different $T_{c}$ values coexist within a pressure range of $Δ$ $P$ $\sim$ 1 GPa. Moreover, the pressure dependence of the amplitudes of $M_{1}$ ( $T$ ) and $M_{2}$ ( $T$ ) indicates a continuous transfer of the volume fraction between the two SC phases. These behaviors suggest that a crossover of superconductivity occurs in conjunction with the emergence of AFM phase and imply that the SC phases inside and outside the AFM phase could have different origins.

arXiv comment6 pages, 3 figures, to appear in Phys. Rev. B

Crossover of Superconductivity across the antiferromagnetic end point in FeSe1−x​Sx​ under pressure

Abstract

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Crossover of Superconductivity across the antiferromagnetic end point in FeSe $_{1 - x}$ S $_{x}$ under pressure