Effect of heavy-ion irradiation on superconductivity in Ba 0.6K0.4Fe2As2

N. W. Salovich; Hyunsoo Kim; Ajay K. Ghosh; R. W. Giannetta; W. Kwok; U. Welp; B. Shen; S. Zhu; H. H. Wen; M. A. Tanatar; R. Prozorov

doi:10.1103/PhysRevB.87.180502

Effect of heavy-ion irradiation on superconductivity in Ba _0.6K_0.4Fe₂As₂

N. W. Salovich, Hyunsoo Kim, Ajay K. Ghosh, R. W. Giannetta, W. Kwok, U. Welp, B. Shen, S. Zhu, H. H. Wen, M. A. Tanatar, R. Prozorov

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The London penetration depth was measured in optimally doped Ba _0.6K_0.4Fe₂As₂ crystals, with and without columnar defects produced by 1.4 GeV 208Pb irradiation. The low temperature behavior of unirradiated samples was consistent with a fully gapped superconducting state with a minimum energy gap Δ^min/k _BT_C≈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 T2 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.

Original language	English (US)
Article number	180502
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	87
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.87.180502
State	Published - May 8 2013

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.87.180502

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Cite this

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title = "Effect of heavy-ion irradiation on superconductivity in Ba 0.6K0.4Fe2As2",

abstract = "The London penetration depth was measured in optimally doped Ba 0.6K0.4Fe2As2 crystals, with and without columnar defects produced by 1.4 GeV 208Pb irradiation. The low temperature behavior of unirradiated samples was consistent with a fully gapped superconducting state with a minimum energy gap Δmin/k BTC≈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 T2 power law was observed below TC/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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T1 - Effect of heavy-ion irradiation on superconductivity in Ba 0.6K0.4Fe2As2

AU - Salovich, N. W.

AU - Kim, Hyunsoo

AU - Ghosh, Ajay K.

AU - Giannetta, R. W.

AU - Kwok, W.

AU - Welp, U.

AU - Shen, B.

AU - Zhu, S.

AU - Wen, H. H.

AU - Tanatar, M. A.

AU - Prozorov, R.

PY - 2013/5/8

Y1 - 2013/5/8

N2 - The London penetration depth was measured in optimally doped Ba 0.6K0.4Fe2As2 crystals, with and without columnar defects produced by 1.4 GeV 208Pb irradiation. The low temperature behavior of unirradiated samples was consistent with a fully gapped superconducting state with a minimum energy gap Δmin/k BTC≈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 T2 power law was observed below TC/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.

AB - The London penetration depth was measured in optimally doped Ba 0.6K0.4Fe2As2 crystals, with and without columnar defects produced by 1.4 GeV 208Pb irradiation. The low temperature behavior of unirradiated samples was consistent with a fully gapped superconducting state with a minimum energy gap Δmin/k BTC≈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 T2 power law was observed below TC/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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