Pressure-induced phase transition to a novel spin state in striped   nickelates
  We analyze pressure effects on stripe states within a selfconsistent Hartree-Fock calculation for a model of a striped nickelates. The results show a transition induced by high pressure and predict possible new spin states. We describe characteristics in the phonon excitations at the predicted transition, based on a real-space random phase approximation. 
E. Kaneshita and A. R. Bishop