Physics and Astronomy, Ames Laboratory
Journal or Book Title
Physical Review B
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.
American Physical Society
Kim, H.; Gordon, R. T.; Tanatar, Makariy A.; Hua, J.; Welp, U.; Kwok, W. K.; Ni, Ni; Bud’ko, Sergey L.; Canfield, Paul C.; Vorontsov, A. B.; and Prozorov, Ruslan, "London penetration depth in Ba(Fe1-xTx)(2)As-2 (T=Co, Ni) superconductors irradiated with heavy ions" (2010). Physics and Astronomy Publications. 696.