Physical properties of noncentrosymmetric tungsten and molybdenum aluminides

摘要: A lack of spatial inversion symmetry gives rise to a variety unconventional physics, from noncollinear order and Skyrmion lattice phases in magnetic materials topologically-protected surface states certain band insulators, mixed-parity pairing superconductors. The search for exotic physics such is largely limited by candidate materials, often difficulty obtaining crystals. Here, we report the single crystal growth physical properties noncentrosymmetric tungsten aluminide cage compounds Al$_4$W Al$_5$W, alongside related molybdenum aluminides which spin-orbit coupling should be significantly weaker. All are nonmagnetic metals. Their high conductivities suggest opportunity find superconductivity at lower temperatures, while limits can place on their transition temperatures that any may expected exhibit significant parity mixing.