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

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, and R. Prozorov
Phys. Rev. B 87, 180502(R) – Published 8 May 2013

Abstract

The London penetration depth was measured in optimally doped Ba0.6K0.4Fe2As2 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/kBTC1. 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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  • Received 28 February 2013

DOI:https://doi.org/10.1103/PhysRevB.87.180502

©2013 American Physical Society

Authors & Affiliations

N. W. Salovich1, Hyunsoo Kim2, Ajay K. Ghosh1,3, R. W. Giannetta1,*, W. Kwok4, U. Welp4, B. Shen4, S. Zhu4, H.-H. Wen5,6, M. A. Tanatar2, and R. Prozorov2

  • 1Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Department of Physics, Jadavpur University, Kolkata 700032, India
  • 4Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Center for Superconducting Physics and Materials, National Lab for Solid State Microstructures, Nanjing University, Nanjing 210093, China
  • 6Department of Physics, Nanjing University, Nanjing 210093, China

  • *Corresponding author: russg@illinois.edu

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Issue

Vol. 87, Iss. 18 — 1 May 2013

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