Nature of e(g) electron order in La1-xSr1+xMnO4 - art. no. 095502

X-ray scattering measurements of the low-temperature structure of La1-xSr1xMnO4 (0.33 less than or equal to x less than or equal to 0.67) indicate th e existence of three distinct regions: a disordered phase (x < 0.4), a char ge-ordered phase (x <greater than or equal to> 0.5), and a mixed phase (0.4 less than or equal to x < 0.5). For x > 0.5, the modulation vector associa ted with the charge order is incommensurate with the lattice and depends li nearly on the concentration of e(g) electrons. The primary superlattice ref lections are strongly suppressed along the modulation direction and the hig her harmonics are weak, implying the existence of a largely transverse and nearly sinusoidal structural distortion, consistent with a charge-density w ave of the e(g) electrons.