Enhanced critical current properties in Ba0.6K 0.4+xFe2As2 superconductor by overdoping of potassium Article

cited authors

  • Wang, C; Wang, L; Gao, Z; Yao, C; Wang, D; Qi, Y; Zhang, X; Ma, Y

fiu authors

abstract

  • Phase-pure polycrystalline Ba0.6K0.4+xFe 2As2 with 0x0.1 were prepared using a one-step solid-state reaction method. We found that overdoping of potassium can improve the critical current density (Jc). High-field Jc for samples with x=0.1 is three times higher than that for samples with x=0. Overdoping of K has minimal effect on the critical transition temperature (Tc). Less than 0.5 K degradations in Tc was measured for samples with x=0.1. Transmission electron microscopy (TEM) revealed high concentration of dislocations in samples with x=0.1, resulting in enhanced flux pining. Further analyses on magnetization loops for powder samples confirm that K overdoping can promote intragrain Jc. Our results indicate that slight excess of K in Ba0.6 K0.4+x Fe2 As2 superconductor is beneficial to high-field applications. © 2011 American Institute of Physics.

publication date

  • January 24, 2011

Digital Object Identifier (DOI)

volume

  • 98

issue

  • 4