Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe 1-x Co x ) 2 As 2

Murphy, J.; Tanatar, M. A.; Kim, Hyunsoo; Kwok, W.; Welp, U.; Graf, D.; Brooks, J. S.; Bud'ko, S. L.; Canfield, P. C.; Prozorov, R.

doi:10.1103/PhysRevB.88.054514

Title: Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

Journal Article · Thu Aug 01 00:00:00 EDT 2013 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.88.054514· OSTI ID:1385468

Murphy, J.; Tanatar, M. A.; Kim, Hyunsoo; Kwok, W.; Welp, U.; Graf, D.; Brooks, J. S.; Bud'ko, S. L.; Canfield, P. C.; Prozorov, R.

Irradiation with 1.4 GeV ²⁰⁸ Pb ions was used to induce artificial disorder in single crystals of iron-arsenide superconductor Ba(Fe _{1 - x} Co _x ) 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 _Φ = 6 T and 6.5 T with doses 2.22 × 10 ¹¹ d /cm ² and 2.4 × 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 Δ λ ( T ) = A T 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(Fe 1 - x Co x ) 2 As 2 compounds for the entire Co doping range.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385468

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 88, Issue 5; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$