Multiple k magnetic structure and Fermi surface of USb

We present calculations of the multiple k magnetic structures in USb in the framework of spin density functional theory. The system is described by a fully relativistic Hamiltonian including an orbital polarization correction term. Calculations are carried out with the modified augmented spherical waves method which takes into account the full-shape potential and the noncollinearity of the magnetization inside the atomic spheres. The experimentally determined evolution from the ground state triple-k structure towards the single-k structure under pressure is studied. The Fermi surface properties of the ground state triple-k structure are analyzed in detail and compared with experimental data.