Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe2As2

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）. FL...

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Published in中国物理B：英文版 no. 4; pp. 1 - 4
Main Author 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
Format Journal Article
LanguageEnglish
Published 01.04.2016
Subjects
丝状
单晶体
外部磁场
温度变化
磁阻
联合国
超导电性
镍掺杂
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/25/4/047401

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Summary: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.
Bibliography:iron-based pnictide, magnetoresistivity, filamentary superconductivity
11-5639/O4
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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/25/4/047401