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We have studied the effects of band filling and bandwidth control on thechemical potential in perovskite manganites $R_{1-x}A_x$MnO$_3$ ($R$ : rareearth, $A$ : alkaline earth) by measurements of core-level photoemissionspectra. A suppression of the doping-dependent chemical potential shift wasobserved in and around the CE-type charge-ordered composition range, indicatingthat there is charge self-organization such as stripe formation or itsfluctuations. As a function of bandwidth, we observed a downward chemicalpotential shift with increasing bandwidth due to the reduction of theorthorhombic distortion. After subtracting the latter contribution, we found anupward chemical potential shift in the ferromagnetic metallic region$0.3<x<0.5$, which we attribute to the enhancement of double-exchangeinteraction involving the Jahn-Teller-split $e_g$ band.

Chemical potential landscape in band filling and bandwidth-control of manganites: Photoemission spectroscopy measurements