Disproportionation Transition at Critical Interaction Strength: Na${}_{1/2}$CoO${}_2$

K. -W. Lee, J. Kunes, P. Novak +1

Charge disproportionation (CD) and spin differentiation in Na${}_{1/2}$CoO${}_2$ are studied using the correlated band theory approach. The simultaneous CD and gap opening seen previou…