Fig. 1: Unconventional d-wave magnetism and crystallographic structure of Mn5Si3.
From: Observation of a spontaneous anomalous Hall response in the Mn5Si3 d-wave altermagnet candidate
a Conventional antiferromagnet with \({{{{{{{\boldsymbol{t}}}}}}}}{{{{{{{\mathcal{T}}}}}}}}\) symmetry combining translation with time-reversal. b Unconventional d-wave magnetism with broken \({{{{{{{\boldsymbol{t}}}}}}}}{{{{{{{\mathcal{T}}}}}}}}\) symmetry. (Opposite magnetization-density isosurfaces calculated from first principles are marked in red and blue.) c Spin-split Fermi surface cut of an anisotropic d-wave form calculated from first-principles. The Néel vector is along the [\(2\bar{2}01\)] crystal direction ([111] direction in the 3-component a − b − c notation), and we plot spin projection on the [\(2\bar{1}\bar{1}0\)] x-axis ([100] a-axis). d, e Top and side view, resp., of the hexagonal crystal structure of the Mn5Si3 epilayers with marked in-plane a and out-of-plane c lattice constants. f Transmission electron microscopy image of the Mn5Si3 epilayer grown on a Si substrate. g Optical micrograph of the lithographically patterned Hall bar, and orientation of the crystal and the applied magnetic field B.
