Interplay of nematic and magnetic orders in FeSe under pressure
  We offer an explanation for the recently observed pressure-induced magnetic state in the iron-chalcogenide FeSe based on \textit{ab initio} estimates for the pressure evolution of the most important Coulomb interaction parameters. We find that an increase of pressure leads to an overall decrease mostly in the nearest-neighbor Coulomb repulsion, which in turn leads to a reduction of the nematic order and the generation of magnetic stripe order. We treat the concomitant effects of band renormalization and the induced interplay of nematic and magnetic order in a self-consistent way and determine the generic topology of the temperature-pressure phase diagram, and find qualitative agreement with the experimentally determined phase diagram. 
Daniel D. Scherer, Anthony Jacko, Christoph Friedrich, Ersoy Sasioglu,   Stefan Blugel, Roser Valenti, Brian M. Andersen
cond-mat.supr-con cond-mat.str-el