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

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Output type: Journal article

Author list: Murphy J, Tanatar MA, Kim H, Kwok W, Welp U, Graf D, Brooks JS, Bud'ko SL, Canfield PC, Prozorov R

Publisher: American Physical Society

Publication year: 2013

Journal: Physical review B (1098-0121)

Volume number: 88

Issue number: 5

ISSN: 1098-0121

eISSN: 1550-235X

Languages: English-Great Britain (EN-GB)

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Open access status: green

Full text URL: https://arxiv.org/pdf/1308.0537

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.

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