Magnetic Phase Diagram of Hubbard Model in Three Dimensions: the   Second-Order Local Approximation
  A local, second-order (truncated) approximation is applied to the Hubbard model in three dimensions. Lowering the temperature, at half-filling, the paramagnetic ground state becomes unstable towards the formation of a commensurate spin-density-wave (SDW) state (antiferromagnetism) and sufficiently far away from half-filling towards the formation of incommensurate SDW states. The incommensurate-ordering wavevector does not deviate much from the commensurate one, which is in accord with the experimental data for the SDW in chromium alloys. 
A.N.Tahvildar-Zadeh (1), J.K.Freericks (2), M.Jarrell (1) ((1)   University of Cincinnati, (2) Georgetown University)