Stripes induced by orbital ordering in layered manganites

Spin-charge-orbital ordered structures in doped layered manganites are inve stigated using an orbital-degenerate double-exchange model tightly coupled to Jahn-Teller distortions. In the ferromagnetic phase, unexpected diagonal stripes at x = l/m (m = integer) are observed, as in recent experiments. T hese stripes are induced by the orbital degree of freedom, which forms a st aggered pattern in the background. A rr shift in the orbital order across s tripes is identified, analogous to the rr shift in spin order across stripe s in cuprates. At x = 1/4 and 1/3. another nonmagnetic phase with diagonal static charge stripes is stabilized at intermediate values of the t(2g)-spi ns exchange coupling.