High-energy heavy ion and proton irradiation of iron-pnictide superconductors
ORAL
Abstract
We report on magnetization measurements on Ba$_{0.6}$K$_{0.4}$ Fe$_{2}$As$_{2}$ single crystals irradiated with 6 MeV protons followed by 1.4 GeV Pb ions to a dose matching field of 2.0 Tesla. We see a systematic increase of the critical current at all temperatures and fields with J$_{c}$ increasing nearly a factor of ten at 20 K. In addition, we report on magnetization measurements on Ba$_{0.6}$K$_{0.4}$ Fe$_{2}$As$_{2}$ single crystals irradiated with 1.4GeV Pb ions to dose matching fields of 0.1T and 1.0T. Here, we see a systematic increase of both the irreversibility line and the critical current with increasing irradiation dose. Our results show that both proton and heavy ions are good candidates for increasing vortex pinning in these materials.
*This work was supported by the US Department of Energy, BES-Materials Sciences, under Contract DE-AC02-06CH11357.
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Authors
W.K. Kwok
Materials Science Division, Argonne National Laboratory
J. Hua
Materials Science Division, Argonne National Laboratory
A.E. Koshelev
Materials Science Division, Argonne National Laboratory
V.K. Vlasko-Vlasov
Materials Science Division, Argonne National Laboratory
J. Schlueter
Materials Science Division, Argonne National Laboratory
H. Claus
Materials Science Division, Argonne National Laboratory
U. Welp
Materials Science Division, Argonne National Laboratory
