Effect of heavy-ion irradiation on London penetration depth in
over-doped Ba(Fe,Co)2As2
release_fyqhhypxfrf2bl2azaqmpgln3a
by
J. Murphy, M. A. Tanatar, Hyunsoo Kim, W. Kwok, U. Welp, D. Graf, J.
S. Brooks, S. L. Bud'ko, P. C. Canfield, R. Prozorov
2013
Abstract
Irradiation with 1.4 GeV ^208Pb ions was used to induce artificial
disorder in single crystals of iron-arsenide superconductor
Ba(Fe_1-xCo_x)_2As_2 and to study its effect on the
temperature-dependent London penetration depth and transport properties. Study
was undertaken on overdoped single crystals with x=0.108 and x=0.127
characterized by notable modulation of the superconducting gap. Irradiation
with doses 2.22×10^11d/cm^2 and
2.4×10^11d/cm^2, corresponding to the matching fields of
B_ϕ = 6 T and 6.5 T, respectively, suppresses the superconducting T_c
by approximately 0.3 to 1 K. The variation of the low-temperature penetration
depth in both pristine and irradiated samples is well described by the
power-law, Δλ (T)=AT^n. Irradiation increases the magnitude of
the pre-factor A and decreases the exponent n, similar to the effect of
irradiation in optimally doped samples. This finding supports universal
s_± pairing in Ba(Fe_1-xCo_x)_2As_2 compounds for the whole Co
doping range.
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