Coulomb-Enhanced Spin-Orbit Splitting: The Missing Piece in the Sr2RhO4   Puzzle
  The outstanding discrepancy between the measured and calculated (local-density approximation) Fermi surfaces in the well-characterized, paramagnetic Fermi liquid Sr2RhO4 is resolved by including the spin-orbit coupling and Coulomb repulsion. This results in an effective spin-orbit coupling constant enhanced 2.15 times over the bare value. A simple formalism allows discussion of other systems. For Sr2RhO4, the experimental specific-heat and mass enhancements are found to be 2.2. 
Guo-Qiang Liu, V. N. Antonov, O. Jepsen, and O.K. Andersen