Abstract
The roles of crystal-field splitting and Jahn-Teller distortions on the orbital ordering transition are investigated in the single-layer manganites near half doping. Crystal-field splitting of energy levels favoring the d 3z2 − r2 occupancy provides not only the correct Fermi surface topology for La0.5Sr1.5MnO4 having a circular electron pocket around the Γ point, but also enhances the flatness of the hole pocket around the M point thereby improving the nesting. In the presence of the circular electron pocket, Jahn-Teller distortions are found to be crucial for the transition to the transverse orbital ordering with ordering wavevector (0.5π,0.5π). In the hole-doping regime 0.5 ≤ x ≤ 0.7, the orbital ordering wavevector shows a linear dependence on the hole concentration in accordance with the experiments.
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Singh, D.K. Orbital ordering transition in the single-layer manganites near half doping: a weak-coupling approach. Eur. Phys. J. B 88, 101 (2015). https://doi.org/10.1140/epjb/e2015-60044-3
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DOI: https://doi.org/10.1140/epjb/e2015-60044-3