Possible mechanism of charge stripe formation based on the ring exchange interaction

Sakai, Toru

The charge stripes observed in the high-Tc cuprate superconductors have attracted a great interest in the field of superconductivity for a long time. A lot of clear evidences were detected by the neutron scattering and the STM etc. In our previous works, we proposed a possible mechanism of the charge stripe formation based on the ring exchange interaction which is originated from the strong electron correlation. The numerical exact diagonalization study of the t-J model with the ring exchange gave a reasonable phase diagram of the vertical charge stripe in the work. However, some transition metal oxides did not exhibit only the vertical charge stripe but also the diagonal one. In the present study, we investigate two-types of charge stripes and present a new phase diagram including the both charge stripe phases.