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Chin. Phys. B, 2016, Vol. 25(4): 047401    DOI: 10.1088/1674-1056/25/4/047401
Special Issue: Virtual Special Topic — High temperature superconductivity
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Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe2As2

Wei Zhang(张威)1,2, Yao-Min Dai(戴耀民)2, Bing Xu(许兵)2, Run Yang(杨润)2, Jin-Yun Liu(刘金云)2, Qiang-Tao Sui(随强涛)2, Hui-Qian Luo(罗会仟)2, Rui Zhang(张睿)2, Xing-Ye Lu(鲁兴业)2, Hao Yang(杨浩)3, Xiang-Gang Qiu(邱祥冈)2
1 College of Physics, Optoelectronics and Energy and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Abstract  

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.

Keywords:  iron-based pnictide      magnetoresistivity      filamentary superconductivity  
Received:  07 January 2016      Revised:  28 January 2016      Published:  05 April 2016
PACS:  74.25.Dw (Superconductivity phase diagrams)  
  74.25.F- (Transport properties)  
  74.70.Xa (Pnictides and chalcogenides)  
  74.81.-g (Inhomogeneous superconductors and superconducting systems, including electronic inhomogeneities)  
Fund: 

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

Corresponding Authors:  Hao Yang, Xiang-Gang Qiu     E-mail:  yanghao@nuaa.edu.cn;xgqiu@iphy.ac.cn

Cite this article: 

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) Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe2As2 2016 Chin. Phys. B 25 047401

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