Superconductivity and phase diagram of (Li0.8Fe0.2)OHFeSe1−xSx
X. F. Lu, N. Z. Wang, X. G. Luo, G. H. Zhang, X. L. Gong, F. Q. Huang, X. H. Chen
DOI 10.1103/PhysRevB.90.214520 · Physical Review B
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Abstract
A series of (Li0.8Fe0.2)OHFeSe1−xSx (0≤x≤1) samples were successfully synthesized via hydrothermal reaction method and the phase diagram is established. Magnetic susceptibility suggests that an antiferromagnetism arising from (Li0.8Fe0.2)OH layers coexists with superconductivity, and the antiferromagnetic transition temperature nearly remains constant for various S doping levels. In addition, the lattice parameters of the both a and c axes decrease and the superconducting transition temperature Tc is gradually suppressed with the substitution of S for Se, and eventually superconductivity vanishes at x=0.90. The decrease of Tc could be attributed to the effect of chemical pressure induced by the smaller ionic size of S relative to that of Se, being consistent with the effect of hydrostatic pressure on (Li0.8Fe0.2)OHFeSe. But the detailed investigation on the relationships between Tc and the crystallographic facts suggests a very different dependence of Tc on anion height from the Fe2 layer or Ch−Fe2−Ch angle from those in FeAs-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Li0.8Fe0.2)OHFeSe1-xSx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | onset |
| (Li0.8Fe0.2)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| LaFeAs1-xPxO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.8 | Pressure not reported | unknown |
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