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We have studied the chemical potential shift in La$_{2-x}$Sr$_x$NiO$_4$ andthe charge ordering transition in La$_{1.67}$Sr$_{0.33}$NiO$_4$ byphotoemission spectroscopy. The result shows a large ($\sim$ 1 eV/hole)downward shift of the chemical potential with hole doping in the high-dopingregime ($\delta \gtrsim$ 0.33) while the shift is suppressed in the low-dopingregime ($\delta \lesssim$ 0.33). This suppression is attributed to asegregation of doped holes on a microscopic scale when the hole concentrationis lower than $\delta \simeq 1/3$. In the $\delta = 1/3$ sample, thephotoemission intensity at the chemical potential vanishes below the chargeordering transition temperature $T_{\rm CO}=$ 240 K.Comment: 5 pages, 4 figure

physical review. b, condensed matter

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Charge ordering and chemical potential shift inLa2−xSrx