Intersecting topological nodal ring and nodal wall states in superhard superconductor FeB4

Feng Zhou, Ying Liu, Jianhua Wang, Minquan Kuang, Tie Yang, Hong Chen, Xiaotian Wang, and Zhenxiang Cheng
Phys. Rev. Materials 5, 074201 – Published 29 July 2021
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Abstract

Novel materials with both topological nontrivial states and superconductivity have attracted considerable attention in recent years. Single-crystal FeB4 was recently synthesized and demonstrated to exhibit superconductivity at temperatures lower than 2.9 K, and its nanoindentation hardness was measured to be 65 GPa. In this study, based on first-principles calculations and the low-energy k·p effective Hamiltonian, we found that this Pnnm-type superhard FeB4 superconductor hosts topological behaviors with intersecting nodal rings (INRs) in the kx=0 and kz=0 planes and nodal wall states in the ky=π and kz=π planes. The observed surface drum-head-like (D-H-L) states on the [100] and [001] surfaces confirmed the presence of INR states in this system. According to our investigation results, FeB4, with its superconductivity, superior mechanical behaviors, one-dimensional and two-dimensional topological elements, and D-H-L surface states, is an existing single-phase target material that can be used to realize the topological superconducting state in the near future.

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  • Received 2 January 2021
  • Accepted 19 July 2021

DOI:https://doi.org/10.1103/PhysRevMaterials.5.074201

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Feng Zhou1, Ying Liu2,*, Jianhua Wang1, Minquan Kuang1, Tie Yang1, Hong Chen1, Xiaotian Wang1,†, and Zhenxiang Cheng3,‡

  • 1School of Physical Science and Technology, Southwest University, Chongqing 400715, China
  • 2School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
  • 3Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia

  • *ying_liu@hebut.edu.cn
  • xiaotianwang@swu.edu.cn
  • cheng@uow.edu.au

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Issue

Vol. 5, Iss. 7 — July 2021

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