Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

8-1-2010

Journal or Book Title

Physical Review B

Volume

82

Issue

6

First Page

060518(R)

DOI

10.1103/PhysRevB.82.060518

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.

Comments

This article is published as Kim, H., 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, and R. Prozorov. "London penetration depth in Ba (Fe 1− x T x) 2 As 2 (T= Co, Ni) superconductors irradiated with heavy ions." Physical Review B 82, no. 6 (2010): 060518(R). DOI: 10.1103/PhysRevB.82.060518. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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