Nonmonotonic fermi surface evolution and its correlation with stripe ordering in bilayer manganites

Using angle-resolved photoemission spectroscopy, we have measured La2−2xSr1+2xMn2O7 over a wide doping range to study the correlation between Fermi surface nesting and stripes of charge and orbital degrees of freedom. We found that the Fermi surface nesting deviates from band calculations with a nonmonotonic behavior, and that one type of stripe is exclusively linked to long flat portions of nested Fermi surface, while the other type prefers to be commensurate with the real-space lattice but also may be driven away from this by the Fermi surface. Complementarily, for certain doping levels pressure from the stripe ordering also may drive the Fermi surface