Chemical potential shift in La(1-x)Sr(x)MnO(3): Photoemission test of the phase separation scenario

Details Chemical potential shift in La(1-x)Sr(x)MnO(3): Photoemission test of the phase separation scenario Chemical potential shift in La(1-x)Sr(x)MnO(3): Photoemission test of the phase separation scenario

2002-04-22

arxiv.org/abs/cond-mat/0204452v1

Europhysics Letters 59, 252 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 figures, to be published in Europhysics Letters

Scientific paper

10.1209/epl/i2002-00234-2

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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