%A Wei Zhang(张威), Yao-Min Dai(戴耀民), Bing Xu(许兵), Run Yang(杨润), Jin-Yun Liu(刘金云), Qiang-Tao Sui(随强涛), Hui-Qian Luo(罗会仟), Rui Zhang(张睿), Xing-Ye Lu(鲁兴业), Hao Yang(杨浩), Xiang-Gang Qiu(邱祥冈) %T Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe2As2 %0 Journal Article %D 2016 %J Chin. Phys. B %R 10.1088/1674-1056/25/4/047401 %P 47401-047401 %V 25 %N 4 %U {https://cpb.iphy.ac.cn/CN/abstract/article_118517.shtml} %8 2016-04-05 %X

We present magnetotransport studies on a series of BaFe2-xNixAs2 (0.03≤ x ≤ 0.10) single crystals. In the underdoped (x = 0.03) non-superconducting sample, the temperature-dependent resistivity exhibits a peak at 22 K, which is associated with the onset of filamentary superconductivity (FLSC). FLSC is suppressed by an external magnetic field in a manner similar to the suppression of bulk superconductivity in an optimally-doped (x=0.10) compound, suggesting the same possible origin as the bulk superconductivity. Our magnetoresistivity measurements reveal that FLSC persists up to the optimal doping and disappears in the overdoped regime where the long-range antiferromagnetic order is completely suppressed, pointing to a close relation between FLSC and the magnetic order.