EFFECT OF INTER-SITE ELECTRON-ELECTRON INTERACTION ON THE SPIN AND CHARGE-DENSITY IN INTERCHAIN COUPLED ORGANIC FERROMAGNETS

A theoretical model is given to deal with two neighboring organic ferr omagnetic chains including the inter-site electron-electron interactio n. The results show that when the inter-site e-e interaction is greate r than a critical value, which varies with the interchain coupling, th ere exists charge density wave(CDW) along the main chain. When the int erchain coupling increases to a critical value, the CDW disappears and the spin density redistributes. The interchain coupling stabilizes th e ferromagnetic state while the inter-site e-e interaction makes it un stable.