Large spin to charge conversion in the topological superconductor βPdBi2 at room temperature

Yang Li, Shi-jia Yang, Dali Sun, Yun-bin Sun, Yan Li, Eric Vetter, Rui Sun, Na Li, Xu Yang, Lei Su, Zi-zhao Gong, Zong-kai Xie, Jian-jun Zhao, Wei He, Xiang-qun Zhang, and Zhao-hua Cheng
Phys. Rev. B 102, 014420 – Published 14 July 2020
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Abstract

βPdBi2 has attracted much attention for its prospective ability to possess simultaneously topological surface and superconducting states due to its unprecedented spin-orbit interaction (SOC). Whereas most works have focused solely on investigating its topological surface states, the coupling between spin and charge degrees of freedom in this class of quantum material remains unexplored. Here, we report a study of spin-to-charge conversion in a βPdBi2 ultrathin film grown by molecular beam epitaxy, utilizing a spin pumping technique to perform inverse spin Hall effect measurements. We find that the room temperature spin Hall angle of Fe/βPdBi2, θSH=0.037. This value is one order of magnitude larger than that of reported conventional superconductors, and is comparable to that of the best SOC metals and topological insulators. Our results provide an avenue for developing superconductor-based spintronic applications.

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  • Received 28 March 2020
  • Revised 31 May 2020
  • Accepted 24 June 2020

DOI:https://doi.org/10.1103/PhysRevB.102.014420

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yang Li1,3,*, Shi-jia Yang2,*, Dali Sun2,6,†, Yun-bin Sun4, Yan Li1,3, Eric Vetter2, Rui Sun1,3, Na Li1,3, Xu Yang1,3, Lei Su1,3, Zi-zhao Gong1,3, Zong-kai Xie1,3, Jian-jun Zhao4, Wei He1, Xiang-qun Zhang1,3, and Zhao-hua Cheng1,3,5,‡

  • 1State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Department of Physics, North Carolina State University, North Carolina 27695, USA
  • 3School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Key Laboratory of Magnetism and Magnetic Materials at Universities of Inner Mongolia Autonomous Region, Department of Physics, Baotou Normal University, Baotou 014030, China
  • 5Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
  • 6Organic and Carbon Electronics Laboratory (ORaCEL), North Carolina State University, North Carolina 27695, USA

  • *These authors contributed equally to this work.
  • Corresponding author: dsun4@ncsu.edu
  • Corresponding author: zhcheng@iphy.ac.cn

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Issue

Vol. 102, Iss. 1 — 1 July 2020

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