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Effect of heavy-ion irradiation on superconductivity in Ba0.6K0.4Fe2As2

TitleEffect of heavy-ion irradiation on superconductivity in Ba0.6K0.4Fe2As2
Publication TypeJournal Article
Year of Publication2013
AuthorsSalovich, NW, Kim, H, Ghosh, AK, Giannetta, RW, Kwok, W, Welp, U, Shen, B, Zhu, S, Wen, HH, Tanatar, MA, Prozorov, R
JournalPhysical Review B
Date Published05
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000318687000001
Keywordsdensity, impurities, state, wave

The London penetration depth was measured in optimally doped Ba0.6K0.4Fe2As2 crystals, with and without columnar defects produced by 1.4 GeV Pb-208 irradiation. The low temperature behavior of unirradiated samples was consistent with a fully gapped superconducting state with a minimum energy gap Delta(min)/k(B)T(C) approximate to 1. Similar gap values were observed for irradiation levels corresponding to mean column-column separations of 32 and 22 nm. At very high irradiation levels (column-column separation of 10 nm) a T-2 power law was observed below T-C/3, most likely due to elevated scattering. Neither the location nor the sharpness of the superconducting transition was affected by irradiation. The data provide evidence for an s(+-) pairing state.

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