Possible p-Wave Superconductivity in Epitaxial Bi/Ni Bilayers

Superconductivity （SC） is one of the most intriguing physical phenomena in nature. Nucleation of SC has long been considered highly unfavorable if not impossible near ferromagnetism, in low dimensionality and, above all, out of non-superconductor. Here we report observation of SC with TC near 4K in...

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Bibliographic Details
Published in:Chinese physics letters 2015-06, Vol.32 (6), p.146-149
Main Author: 龚欣欣 周和心 徐鹏超 朱凯 金晓峰 田鹤 赵格剑 陈庭勇
Format: Article
Language:English
Subjects:
Compatibility
Ferromagnetic materials
Ferromagnetism
Magnetism
Nucleation
phonons, thermal conductivity, thermoelectric, spin dynamics, spintronics
Point contact
Reflection
Superconductivity
供应链
物理现象
自然界
超导电性
铁磁性
铁磁薄膜
镍
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Summary:Superconductivity （SC） is one of the most intriguing physical phenomena in nature. Nucleation of SC has long been considered highly unfavorable if not impossible near ferromagnetism, in low dimensionality and, above all, out of non-superconductor. Here we report observation of SC with TC near 4K in Ni/Bi bilayers that defies all known paradigms of superconductivity, where neither ferromagnetic Ni film nor rhombohedra Bi film is superconducting in isolation. This highly unusual SC is independent of the growth order （Ni/Bi or Bi/Ni）, but highly sensitive to the constituent layer thicknesses. Most importantly, the SC, distinctively non-s pairing, is triggered from, but does not occur at, the Bi/Ni interface. Using point contact Andreev reflection, we show evidences that the unique SC, naturally compatible with magnetism, is triplet p-wave pairing.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/6/067402