Crossover of superconductivity across the antiferromagnetic end point in FeSe1−xSx under pressure
Kiyotaka Miyoshi, Takanobu Nakatani, Yumi Yamamoto, Takumi Maeda, Daichi Izuhara, Ikumi Matsushima
DOI 10.1103/lxzc-l3md · Physical Review B
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Abstract
Temperature-pressure (T−P) phase diagrams of FeSe1−xSx 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 M1(T) and M2(T), indicating that two superconducting (SC) phases with different Tc values coexist within a pressure range of ΔP∼1GPa. Moreover, the pressure dependence of the amplitudes of M1(T) and M2(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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe1-xSx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure unresolved | onset |
| FeSe1-xSx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure unresolved | onset |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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