Symmetry-protected spinful magnetic Weyl nodal loops and multi-Weyl nodes in 5dn cubic double perovskites (n=1,2)

2020/07/27 by Young-Joon Song, K. -W. Lee, Kwan-Woo Lee · 9 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Band gap #Condensed matter physics #Dirac (video compression format) #Ferromagnetism #Neutrino #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Semimetal #Topological Materials and Phenomena #Weyl semimetal #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.102.035155

published in Physical review. B./Physical review. B 102(3) (American Physical Society) · 10 pages with 9 embedded figures (mirror corrections)

openalex publication_date 2020/07/27 · arxiv created 2020/07/28 · arxiv updated 2020/07/29 · openalex created_date 2020/08/03 · openalex updated_date 2026/08/05

Abstract

Using both an effective three-band model and ab initio calculations, we have investigated various topological features in the cubic ferromagnetic 5d^1,2 systems showing large spin-orbit coupling (SOC): Ba₂NaOsO₆, Sr₂SrOsO₆, and Ba₂BReO₆ (B=Mg, Zn). In the presence of time-reversal symmetry (T), spinless Dirac nodal loops linked to each other at the W points appear in the mirror planes. Remarkably, breaking T leads to spinful magnetic Weyl nodal loops (MWNLs) that are robust even at large SOC and correlation strength U variation due to the combination of mirror symmetry and broken T. Additionally, there are two types of magnetic Weyl points with chiral charges |\ensuremathχ|=1,2 along the C_4v symmetry line, and another type-II MWNL encircling the zone center, that are dependent on U. Furthermore, the ferromagnetic Ba₂ZnReO₆ is an ideal half semimetal with MWNLs and magnetic Weyl nodes at the Fermi level without the interference of topologically trivial bulk states. These systems give rise to a remarkably large anomalous Hall conductivity \ensuremathσ_xy of up to 1160 (\mathrm\ensuremathΩ\phantom\rule0.16em0excm)^\ensuremath-1. Our findings may apply widely for t_2g systems with cubic (or slightly distorted) fcc-like structures.

Citations

• Chern Semimetal and the Quantized Anomalous Hall Effect inHgCr2Se4
• Half semimetallic antiferromagnetism in theSr2CrTO6system(T=Os,Ru)
• Generalized Gradient Approximation Made Simple
• High-temperature surface superconductivity in topological flat-band systems
• Anomalous Hall effect
• Chern Numbers in Discretized Brillouin Zone: Efficient Method of Computing (Spin) Hall Conductances
• Quantized Hall Conductance in a Two-Dimensional Periodic Potential
• Topological Crystalline Insulators
• Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry
• Orbital-quenching–induced magnetism in Ba 2 NaOsO 6
• Topological Nature of Anomalous Hall Effect in Ferromagnets
• Discovery of a Weyl fermion semimetal and topological Fermi arcs
• Berry phase effects on electronic properties
• From Nodal Chain Semimetal to Weyl Semimetal in HfC
• Symmetry demanded topological nodal-line materials
• Topological Hopf and Chain Link Semimetal States and Their Application to Co2MnGa
• Ferromagnetism above 1000 K in a highly cation-ordered double-perovskite insulator Sr3OsO6
• Weyl-loop half-metal in Li3(FeO3)2