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Title: Vortex-glass phase transition and enhanced flux pinning in C4+-irradiated BaFe1.9Ni0.1As2 superconducting single crystals
Authors: Shabhazi, M
Wang, XL
Ghorbani, SR
Ionescu, M
Shcherbakova, OV
Wells, FS
Pan, AV
Dou, SX
Choi, KY
Keywords: Phase tranformations
Vortex theory
Magnetic flux
Issue Date: 13-Aug-2013
Publisher: IOP Publishing
Citation: Shahbazi, M., Wang, X. L., Ghorbani, S. R., Ionescu, M., Shcherbakova, O. V., Wells, F. S., Pan, A. V., & Choi, K. Y. (2013). Vortex-glass phase transition and enhanced flux pinning in C4+-irradiated BaFe1.9Ni0.1As2 superconducting single crystals. Superconductor Science and Technology, 26(9), 095014. doi:10.1088/0953-2048/26/9/095014
Abstract: We report the effects of C4+-irradiation on the superconducting properties of BaFe1.9Ni0.1As2 single crystal. The BaFe1.9Ni0.1As2 single crystal before and after C4+-irradiation was characterized by magnetic, magneto-transport and magneto-optical techniques over a wide range of magnetic fields (0–13 T) and temperatures (2–200 K). We demonstrate that the C4+-irradiation significantly enhances the in-field critical current density (by a factor of up to 1.5 at 5 K) and induces enhanced flux jumping at 2 K, with only a small degradation (by 0.5 K) of the critical temperature, Tc. The vortex phase diagram describing the evolution of the vortex-glass transition temperature with magnetic field and the upper critical field has been resolved for the C4+-irradiated sample. For temperatures below Tc, the resistivity curves and the pinning potential were found to show good scaling, using a modified model for vortex-liquid resistivity. The vortex state is three dimensional at temperatures lower than a characteristic temperature. Good agreement between the thermally activated flux flow model, which is usually employed to account for the resistivity in the vortex-liquid region, and the modified vortex-liquid model, has been observed. © 2013 IOP Publishing
Gov't Doc #: 8987
ISSN: 1361-6668
Appears in Collections:Journal Articles

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