Charge ordering and chemical potential shift in La2-xSrxNiO4 studied by photoemission spectroscopy

M. Satake, K. Kobayashi, Takashi Mizokawa, A. Fujimori, T. Tanabe, T. Katsufuji, Y. Tokura

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Abstract

We have studied the chemical potential shift in La2-xSrxNiO4 and the charge ordering transition in La1.67Sr0.33NiO4 by photoemission spectroscopy. The result shows a large (∼1 eV/hole) downward shift of the chemical potential with hole doping in the high-doping regime (δ≳0.33) while the shift is suppressed in the low-doping regime (δ≲0.33). This suppression is attributed to a segregation of doped holes on a microscopic scale when the hole concentration is lower than δ≃1/3. In the δ=1/3 sample, the photoemission intensity at the chemical potential vanishes below the charge ordering transition temperature TCO=240 K.

Original languageEnglish
Pages (from-to)15515-15518
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number23
Publication statusPublished - 2000
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Satake, M., Kobayashi, K., Mizokawa, T., Fujimori, A., Tanabe, T., Katsufuji, T., & Tokura, Y. (2000). Charge ordering and chemical potential shift in La2-xSrxNiO4 studied by photoemission spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 61(23), 15515-15518.