INTERPLAY OF CHARGE-DENSITY AND SPIN-DENSITY IN DCNQI-CU SALTS

Treating the periodic Anderson model with the electron-phonon (e-p) interaction in the mean field theory, we examine the insulating state in DCNQI-Cu salts as the function of both the temperature and the e-p coupling constant. By extending the work [J. Phys. Soc. Jpn. 61 (1992) 3322] to the case where the e-p interaction at the Cu site is added, it is shown that the phase transition into the coexistent state of charge density and spin density is accompanied by the large jump of their amplitudes in addition to the hysteresis.