Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe_2As_2  

作　　者：张威 戴耀民 许兵 杨润 刘金云 随强涛 罗会仟 张睿 鲁兴业 杨浩 邱祥冈 

机构地区：[1]College of Physics, Optoelectronics and Energy and Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University [2]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences [3]College of Science, Nanjing University of Aeronautics and Astronautics

出　　处：《Chinese Physics B》2016年第4期1-4,共4页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China(Grant Nos.2012CB821400,2012CB921302,and 2015CB921303);the National Natural Science Foundation of China(Grant Nos.11274237,91121004,51228201,11004238,and 11374011)

摘　　要：We present magnetotransport studies on a series of BaFe2_xNixAs2 （0.03 〈 x 〈 0.10） single crystals. In the un- derdoped （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.We present magnetotransport studies on a series of BaFe2_xNixAs2 （0.03 〈 x 〈 0.10） single crystals. In the un- derdoped （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.

关 键 词：iron-based pnictide MAGNETORESISTIVITY filamentary superconductivity 

分 类 号：O511.3[一般工业技术—材料科学与工程]