London penetration depth and strong pair breaking in iron-based superconductors
R. T. Gordon, H. Kim, M. A. Tanatar, R. Prozorov, V. G. Kogan
DOI 10.1103/PhysRevB.81.180501 · Physical Review B
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Abstract
The low-temperature variation in the London penetration depth for a number of iron-pnictide and iron-chalcogenide superconductors is nearly quadratic, Δλ(T)=βTn with n≈2. The coefficient in this dependence shows a robust scaling, β∝1/Tc3 across different families of these materials. We associate the scaling with a strong pair breaking. The same mechanism has recently been suggested to explain the scalings of the specific-heat jump, ΔC∝Tc3 [Bud’ko et al., Phys. Rev. B 79, 220516(R) (2009)], and the slopes of the upper critical field, dHc2/dT∝Tc in these materials [Kogan, Phys. Rev. B 80, 214532 (2009)]. This suggests that thermodynamic and electromagnetic properties of the iron-based superconductors can be described within a strong pair-breaking scenario (this work).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeTe1-xSex 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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