Enhancement of superconductivity in La1−xSmxO0.5F0.5BiS2
Y. Fang, D. Yazici, B. D. White, M. B. Maple
DOI 10.1103/PhysRevB.91.064510 · Physical Review B
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Abstract
The superconducting and normal-state properties of La1−xSmxO0.5F0.5BiS2 (0.1≤x≤0.9) have been studied via electrical resistivity, magnetic susceptibility, and specific heat measurements. By using suitable synthesis conditions, Sm exhibits considerable solubility into the CeOBiS2-type LaO0.5F0.5BiS2 lattice. In addition to a considerable enhancement of the superconducting volume fraction, it is found that the superconducting transition temperature Tc is dramatically enhanced with increasing Sm concentration to 5.4 K at x=0.8. These results suggest that Tc for SmO0.5F0.5BiS2 could be as high as ∼6.2 K, and comparably high Tc values might also be obtained in the compounds LnO0.5F0.5BiS2 (Ln=Eu−Tm) if they can be synthesized.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1-xSmxO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.4 | Pressure unresolved | midpoint |
| La1-xSmxO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.2 | Pressure unresolved | onset |
| SmO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.2 | Pressure unresolved | unknown |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure unresolved | unknown |
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