Signature of multigap nodeless superconductivity in fluorine-doped NdFeAsO
A. Adamski, C. Krellner, M. Abdel-Hafiez
DOI 10.1103/PhysRevB.96.100503 · Physical Review B
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Abstract
We investigate the temperature dependence of the lower critical field Hc1(T), the field at which vortices penetrate into the sample, of a high-quality fluorine-doped NdFeAsO single crystal under static magnetic fields H parallel to the c axis. The temperature dependence of the first vortex penetration field has been experimentally obtained and pronounced changes of the Hc1(T) curvature are observed, which are attributed to the multiband superconductivity. Using a two-band model with s-wave-like gaps, the temperature dependence of the lower critical field Hc1(T) can be well described. These observations clearly show that the superconducting energy gap in fluorine-doped NdFeAsO is nodeless. The values of the penetration depth at T=0K have been determined and confirm that the pnictide superconductors obey an Uemura-style relationship between Tc and λab(0)−2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NdFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45.4 | Pressure not reported | onset |
| NdFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52.8 | Pressure not reported | onset |
| NdFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44.5 | Pressure not reported | onset |
| NdFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52.5 | Pressure not reported | onset |
| NdFeAsO0.82F0.18 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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