London penetration depth in Ba(Fe1−xTx)2As2 (T=Co, Ni) superconductors irradiated with heavy ions
H. Kim, R. T. Gordon, M. A. Tanatar, J. Hua, U. Welp, W. K. Kwok, N. Ni, S. L. Bud’ko, P. C. Canfield, A. B. Vorontsov, R. Prozorov
DOI 10.1103/PhysRevB.82.060518 · Physical Review B
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Abstract
Irradiation with Pb ions was used to study the effect of disorder on the in-plane London penetration depth, λ(T), in single crystals of Ba(Fe1−xTx)2As2 (T=Co, Ni). An increase in the irradiation dose results in a monotonic decrease in the superconducting transition temperature, Tc, without affecting much the transition width. In both Co- and Ni-doped systems we find a power-law behavior, Δλ(T)∝Tn with the exponent n systematically decreasing with the increase in disorder. This observation, at qualitative odds with the response of s- and d-wave superconductors, finds natural explanation in a nodeless s± state with pairbreaking (interband) impurity scattering. We are able to describe the effect quantitatively assuming the pairbreaking strength intermediate between Born and unitary limits.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.5 | Pressure not reported | unknown |
| Ba(Fe1-xNix)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18.9 | Pressure not reported | unknown |
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