Superconducting gap structure in ambient-pressure-grown LaO0.5F0.5BiS2
Jian Zhang, K. Huang, Z. F. Ding, D. E. MacLaughlin, O. O. Bernal, P.-C. Ho, C. Tan, X. Liu, D. Yazici, M. B. Maple, Lei Shu
DOI 10.1103/PhysRevB.94.224502 · Physical Review B
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Abstract
We have performed transverse-field muon spin relaxation measurements on ambient-pressure-grown polycrystalline LaO0.5F0.5BiS2. From these measurements, no signature of magnetic order is found down to 25 mK. The value of the magnetic penetration depth extrapolated to 0 K is 0.89 (5) μm. The temperature dependence of superconducting penetration depth is best described by either a multigap s+s-wave model with Δ1=0.947 (7) meV and Δ2=0.22 (4) meV or the anisotropic s-wave model with Δ(0)=0.776 meV and anisotropic gap amplitude ratio Δmin/Δmax=0.34. Comparisons with other potentially multigap BiS2-based superconductors are discussed. We find that these BiS2-based superconductors, including Bi4O4S3 and the high-pressure synthesized LaO0.5F0.5BiS2, generally conform to the Uemura relation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.9 | Pressure unresolved | onset |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.9 | Pressure unresolved | onset |
| Bi4O4S3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.6 | Pressure not reported | unknown |
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