Chemical potential shift in La1 − xSrxMnO3: Photoemission test of the phase separation scenario

Jobu Matsuno, A. Fujimori, Y. Takeda, M. Takano

Type: Article

Publication Date: 2002-07-01

Citations: 41

DOI: https://doi.org/10.1209/epl/i2002-00234-2

Abstract

We have studied the chemical potential shift in La(1-x)Sr(x)MnO(3) as a function of doped hole concentration by core-level x-ray photoemission. The shift is monotonous, which means that there is no electronic phase separation on a macroscopic scale, whereas it is consistent with the nano-meter scale cluster formation induced by chemical disorder. Comparison of the observed shift with the shift deduced from the electronic specific heat indicates that hole doping in La(1-x)Sr(x)MnO(3) is well described by the rigid-band picture. In particular no mass enhancement toward the metal-insulator boundary was implied by the chemical potential shift, consistent with the electronic specific heat data.

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Chemical potential shift in La<sub>1 − x</sub>Sr<sub>x</sub>MnO<sub>3</sub>: Photoemission test of the phase separation scenario

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