Correlation of electronic structure and ordered charge and orbital patterns for single-layered manganites in a wide hole-doping range (0≤x≤1)

We investigated the doping-dependent evolution of the charge-orbital ordering (CO-OO) phase using optical spectroscopy of a series of single-layer manganites, La1-xSr1+xMnO4 (x=0 and 1) and Pr1-xCa1+xMnO4 (0.3 <= x <= 0.7). We found that the electronic response of the CO-OO phase changes asymmetrically with respect to the addition or removal of e(g) electrons from x=1/2. Especially, low-energy optical spectra depend strongly on the modulation vector of striped phase in a higher doping region (x >= 1/2). This finding highlights the role of the nanoscale structure of e(g) ordering in the electronic property of the striped phase in the layered manganite.