Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe2As2

doi:10.1088/1674-1056/25/4/047401

Abstract

We present magnetotransport studies on a series of BaFe_2-xNi_xAs₂ (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
Accepted manuscript online:

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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Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe2As2

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Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe₂As₂