Abstract
The charge ordering phenomena in quasi-two-dimensional 1/4-filled organic conductors (ET) 2 X (ET=BEDT-TTF) are investigated theoretically for θ and α-type compounds based on extended Hubbard models with both on-site and intersite Coulomb interactions. It is found by mean field calculations that charge ordered states of stripe-type are stabilized for the relevant values of Coulomb energies. By comparing the results of calculations with the experimental facts, where the effects of quantum fluctuation is incorporated by mapping the stripe-type charge ordered states to the S = 1/2 Heisenberg Hamiltonians, the actual charge patterns in the insulating phases of stucturally dimerized θ-(ET) 2 X (θ d -type in the text) and α-(ET) 2 I 3 are deduced. We also discuss that the effect of frustration among the intersite Coulomb interactions may give rise to a peculiar state in the quenched state of θ-(ET) 2 RbZn(SCN) 4 .
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
