Magnetic order induces symmetry breaking in the single crystalline orthorhombic CuMnAs semimetal

Abstract

Recently, orthorhombic CuMnAs has been proposed to be a magnetic material where topological fermions exist around the Fermi level. Here we report the magnetic structure of the orthorhombic Cu0.95MnAs and Cu0.98Mn0.96As single crystals. While Cu0.95MnAs is a commensurate antiferromagnet (C-AFM) below 360 K with a propagation vector of k = 0, Cu0.98Mn0.96As undergoes a second-order paramagnetic to incommensurate antiferromagnetic (IC-AFM) phase transition at 320 K with k = (0.1,0,0), followed by a second-order IC-AFM to C-AFM phase transition at 230 K. In the C-AFM state, the Mn spins order parallel to the b-axis but antiparallel to their nearest-neighbors with the easy axis along the b axis. This magnetic order breaks Ry gliding and S2z rotational symmetries, the two crucial for symmetry analysis, resulting in finite band gaps at the crossing point and the disappearance of the massless topological fermions. However, the spin-polarized surface states and signature induced by non-trivial topology still can be observed in this system, which makes orthorhombic CuMnAs promising in antiferromagnetic spintronics.

References in corpus (22)

• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Electrical switching of an antiferromagnet
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
• Experimental Realization of a Three-Dimensional Dirac Semimetal
• Signatures of the Adler-Bell-Jackiw chiral anomaly in a Weyl Fermion semimetal
• The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi
• Dynamical Axion Field in Topological Magnetic Insulators
• Topological nodal-line fermions in ZrSiSe and ZrSiTe
• Dirac Fermions in Antiferromagnetic Semimetal
• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
• Electric control of Dirac quasiparticles by spin-orbit torque in an antiferromagnet
• A magnetic topological semimetal Sr1-yMn1-zSb2 (y, z< 0.1)
• Quantum transport of two-dimensional Dirac fermions in SrMnBi2
• Two dimensional Dirac fermions and quantum magnetoresistance in CaMnBi${}_2$
• Anomalous conductivity tensor in the Dirac semimetal Na_3Bi
• Nontrivial Berry phase in magnetic BaMnSb2 semimetal
• Nearly massless Dirac fermions hosted by Sb square net in BaMnSb2
• Magneto-transport properties of the "hydrogen atom" nodal-line semimetal candidates CaTX (T=Ag, Cd, X=As, Ge)
• Quasi-two-dimensional Dirac fermions and quantum magnetoresistance in LaAgBi${}_2$
• Massive fermions with low mobility in antiferromagnet orthorhombic CuMnAs single crystals

Cited by in corpus (18)

• Chemical Principles of Topological Semimetals
• Magnetically Switchable Light-Matter Interaction in the Two-Dimensional Magnet CrI3
• Tunable Weyl and Dirac states in the nonsymmorphic compound $\mathbf{CeSbTe}$
• Anisotropic magnetoresistance: materials, models and applications
• In-plane anomalous Hall effect in PT-symmetric antiferromagnetic materials
• Band structure of CuMnAs probed by optical and photoemission spectroscopy
• Electrical transport properties of bulk tetragonal CuMnAs
• Itinerant antiferromagnetic BaMn${}_2$Pn${}_2$'s showing both negative and positive magnetoresistances
• Massive fermions with low mobility in antiferromagnet orthorhombic CuMnAs single crystals
• Spin-flop phase transition in the orthorhombic antiferromagnetic topological semimetal Cu0.95MnAs
• The stability and physical properties of the tetragonal phase of bulk CuMnAs antiferromagnet
• Long-Time Magnetic Relaxation in Antiferromagnetic Topological Material EuCd${}_2$As${}_2$
• Spin and anomalous Hall effects emerging from topological degeneracy in Dirac fermion system CuMnAs
• Voltage induced switching of an antiferromagnetically ordered topological Dirac semimetal
• Proper Definition of Intrinsic Nonlinear Current
• An in-plane hexagonal antiferromagnet in the Cu-Mn-As system, Cu${}_{0.82}$Mn${}_{1.18}$As
• Antiferromagnetism and spin density waves in 3D Dirac semimetals
• High-resolution diffraction reveals magnetoelastic coupling and coherent phase separation in tetragonal CuMnAs