Near Room-Temperature Ferrimagnetic Ordering in a Noncentrosymmetric Polar Metal

Compounds that crystallize in noncentrosymmetric polar crystal structures and exhibit magnetic ordering can show interesting and exotic electronic and physical properties that have potential applications in spintronics and quantum technology. However, the reported polar magnetic materials with metallic behavior and ferromagnetic/ferromagnetic ordering near or above room temperature are rare. Here, we present an interesting noncentrosymmetric polar metal that shows a ferrimagnetic ordering temperature near room temperature. It adopts the orthorhombic system with a complex structure featuring trigonal prisms, icosahedra, and pentagonal prims. The polar crystal structure is confirmed by the Rietveld refinement using neutron diffraction data and the convergent-beam electron diffraction. The determined magnetic structure, experimental data of resistivity, heat capacity, and giant magnetoresistivity will be presented. The results of density functional theory calculations used to confirm the metallic behavior and magnetic structure will be presented as well.