Nature of $e_g$ Electron Order in La${}_{1-x}$Sr${}_{1+x}$MnO${}_4$

Abstract

Synchrotron x-ray scattering measurements of the low-temperature structure of the single-layer manganese oxide La${}_{1-x}$Sr${}_{1+x}$MnO${}_4$, over the doping range $0.33\le x\le 0.67$, indicate the existence of three distinct regions: a disordered phase ($x<0.4$), a charge-ordered phase ($x\ge 0.5$), and a mixed phase ($0.4\le x<0.5$). For $x>0.5$, the modulation vector associated with the charge order is incommensurate with the lattice and depends linearly on the concentration of $e_g$ electrons. The primary superlattice reflections are strongly suppressed along the modulation direction and the higher harmonics are weak, implying the existence of a largely transverse and nearly sinusoidal structural distortion, consistent with a charge density wave of the $e_g$ electrons.

4 pages, 4 figures

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