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Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe1-xCox)(2)As-2

TitleEffect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe1-xCox)(2)As-2
Publication TypeJournal Article
Year of Publication2013
AuthorsMurphy, J, Tanatar, MA, Kim, H, Kwok, W, Welp, U, Graf, D, Brooks, JS, Bud'ko, SL, Canfield, PC, Prozorov, R
JournalPhysical Review B
Volume88
Pagination054514
Date Published08
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000323608200002
Keywordscritical field, dependence, high-temperature superconductivity, kfe2as2, scattering, superconductivity, unconventional
Abstract

Irradiation with 1.4 GeV Pb-208 ions was used to induce artificial disorder in single crystals of iron-arsenide superconductor Ba(Fe1-xCox)(2)As-2 and to study its effects on the temperature-dependent London penetration depth and transport properties. A study was undertaken on overdoped single crystals with x = 0.108 and x = 0.127 characterized by notable modulation of the superconducting gap. Irradiation corresponding to the matching fields of B-phi = 6 T and 6.5 T with doses 2.22 x 10(11) d/cm(2) and 2.4 x 10(11) d/cm(2), 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 Delta lambda(T) = AT(n). Irradiation increases the magnitude of the prefactor A and decreases the exponent n, similar to the effect of irradiation in optimally-doped samples. This finding supports universal s(+/-) pairing in Ba(Fe1-xCox)(2)As-2 compounds for the entire Co doping range.

DOI10.1103/PhysRevB.88.054514
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