Evidence for anisotropic spin-triplet Andreev reflection at the 2D van der Waals ferromagnet/superconductor interface

Ranran Cai, Yunyan Yao, Peng Lv, Yang Ma, Wenyu Xing, Boning Li, Yuan Ji, Huibin Zhou, Chenghao Shen, Shuang Jia, X. C. Xie, Igor Žutić, Qing-Feng Sun and Wei Han ()
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Ranran Cai: Peking University
Yunyan Yao: Peking University
Peng Lv: Wuhan University of Technology
Yang Ma: Peking University
Wenyu Xing: Peking University
Boning Li: Peking University
Yuan Ji: Peking University
Huibin Zhou: Peking University
Chenghao Shen: University at Buffalo, State University of New York
Shuang Jia: Peking University
X. C. Xie: Peking University
Igor Žutić: University at Buffalo, State University of New York
Qing-Feng Sun: Peking University
Wei Han: Peking University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Fundamental symmetry breaking and relativistic spin–orbit coupling give rise to fascinating phenomena in quantum materials. Of particular interest are the interfaces between ferromagnets and common s-wave superconductors, where the emergent spin-orbit fields support elusive spin-triplet superconductivity, crucial for superconducting spintronics and topologically-protected Majorana bound states. Here, we report the observation of large magnetoresistances at the interface between a quasi-two-dimensional van der Waals ferromagnet Fe0.29TaS2 and a conventional s-wave superconductor NbN, which provides the possible experimental evidence for the spin-triplet Andreev reflection and induced spin-triplet superconductivity at ferromagnet/superconductor interface arising from Rashba spin-orbit coupling. The temperature, voltage, and interfacial barrier dependences of the magnetoresistance further support the induced spin-triplet superconductivity and spin-triplet Andreev reflection. This discovery, together with the impressive advances in two-dimensional van der Waals ferromagnets, opens an important opportunity to design and probe superconducting interfaces with exotic properties.

Date: 2021
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DOI: 10.1038/s41467-021-27041-w

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