Intersecting topological nodal ring and nodal wall states in superhard superconductor FeB4
Publication Name
Physical Review Materials
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.
Open Access Status
This publication may be available as open access
Volume
5
Issue
7
Article Number
074201
Funding Number
51801163
Funding Sponsor
National Natural Science Foundation of China