London penetration depth in Ba(Fesub 1-x}T{sub x}){sub 2}As{sub 2} (T = Co, Ni) superconductors irradiated with heavy ions.
Irradiation with Pb ions was used to study the effect of disorder on the in-plane London penetration depth, {Lambda}(T), in single crystals of Ba(Fe{sub 1-x}T{sub x}){sub 2}As{sub 2} (T = Co, Ni). An increase in the irradiation dose results in a monotonic decrease in the superconducting transition temperature, T{sub c}, without affecting much the transition width. In both Co- and Ni-doped systems we find a power-law behavior, {Delta}{lambda}(T){proportional_to} T{sup n} 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{sup {+-}} state with pairbreaking (interband) impurity scattering. We are able to describe the effect quantitatively assuming the pairbreaking strength intermediate between Born and unitary limits.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1000215
- Report Number(s):
- ANL/MSD/JA-68702; TRN: US1008201
- Journal Information:
- Phys. Rev. B, Vol. 82, Issue 2010
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe Co ) As
Universal doping evolution of the superconducting gap anisotropy in single crystals of electron-doped Ba(Fe1–xRhx)2As2 from London penetration depth measurements