Impact of eight-quark interactions in chiral phase transitions I:   Secondary magnetic catalysis
  The influence of a constant magnetic field on the order parameter of the four-dimensional Nambu and Jona-Lasinio model extended by the 't Hooft six-quark term and eight-quark interactions is considered. It is shown that the multi-quark interactions cause the order parameter to increase sharply (secondary magnetic catalysis) with increasing strength of the field at the characteristic scale $H\sim 10^{14}\Lambda^2$ G/MeV^2. 
A. A. Osipov, B. Hiller, A. H. Blin and J. da Providencia