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

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

2001-01-18

arxiv.org/abs/cond-mat/0101294v2

Phys. Rev. Lett. 87, 095502 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.095502

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.

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