@article{oai:repo.qst.go.jp:00047400,
 author = {Taen, Toshihiro and Ohtake, Fumiaki and Pyon, Sunseng and Tamegai, Tsuyoshi and Kitamura, Hisashi and 田縁 俊光 and 大竹 史哲 and 卞 舜生 and 為ケ井 強 and 北村 尚},
 issue = {8},
 journal = {Superconductor Science and Technology},
 month = {Aug},
 note = {The screening current density (J) and vortex pinning properties for H| | c are studied in optimally hole-doped Ba0.6K0.4Fe2As2 single crystals with a superconducting transition of Tc = 38.6 K. We utilize the irreversible magnetization and its relaxation to evaluate the screening current density and vortex dynamics before and after the introduction of point defects created by 3-MeV proton (H+) irradiation with a dose of  5.8×10 16H+cm2. In the as-grown crystal, both J and vortex dynamics are strongly influenced by temperature and magnetic field, indicating that the predominant pinning is not the weak-collective pinning but the strong pinning. With an introduction of point defects, J in the H+-irradiated crystal at 2 K reaches 1.1×10 7 cm−2, which is one of the largest values in iron-based superconductors. In contrast to the as-grown sample, the sensitivity to the temperature and magnetic field becomes quite mild, and the vortex system is described by a simple weak-collective pinning scenario.},
 pages = {085003-1--085003-8},
 title = {Critical current density and vortex dynamics in pristine and proton-irradiated Ba0.6K0.4Fe2As2},
 volume = {28},
 year = {2015}
}