Synthesis, crystal structure, and chemical stability of the superconductor FeSe1−x
E. Pomjakushina, K. Conder, V. Pomjakushin, M. Bendele, R. Khasanov
DOI 10.1103/PhysRevB.80.024517 · Physical Review B
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Abstract
We report on a comparative study of the crystal structure and the magnetic properties of FeSe1−x (x=0.0–0.15) superconducting samples by neutron powder-diffraction and magnetization measurements. The samples were synthesized by two different methods: a “low-temperature” one using powders as a starting material at T≃700 °C and a “high-temperature” method using solid pieces of Fe and Se at T≃1075 °C. The effect of a starting (nominal) stoichiometry on the phase purity of the obtained samples, the superconducting transition temperature Tc, as well as the chemical stability of FeSe1−x at ambient conditions were investigated. It was found that in the Fe-Se system, a stable phase exhibiting superconductivity at Tc≃8 K exists in a narrow range of selenium concentration (FeSe0.974±0.005).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.28 | Pressure not reported | onset |
| FeSe0.87 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.34 | Pressure not reported | onset |
| FeSe0.92 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.44 | Pressure not reported | onset |
| FeSe0.94 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.21 | Pressure not reported | onset |
| FeSe0.96 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.43 | Pressure not reported | onset |
| FeSe0.98 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.21 | Pressure not reported | onset |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| FeSe0.99 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure not reported | unknown |
| FeSe0.98 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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