Orbital characters of three-dimensional Fermi surfaces in Eu 2-xSr xNiO 4 as probed by soft-x-ray angle-resolved photoemission spectroscopy

M. Uchida, K. Ishizaka, P. Hansmann, X. Yang, M. Sakano, J. Miyawaki, R. Arita, Y. Kaneko, Y. Takata, M. Oura, A. Toschi, K. Held, A. Chainani, O. K. Andersen, S. Shin, Y. Tokura

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8 Citations (Scopus)

Abstract

The three-dimensional Fermi-surface structure of hole-doped metallic layered nickelate Eu 2-xSr xNiO 4 (x=1.1), an important counterpart to the isostructural superconducting cuprate La 2-xSr xCuO 4, is investigated by energy-dependent soft-x-ray angle-resolved photoemission spectroscopy. In addition to a large cylindrical hole Fermi surface analogous to the cuprates, we observe a Γ-centered 3z2-r2-derived small electron pocket. This finding demonstrates that in the layered nickelate the 3z2-r2 band resides close to the x2-y2 one in energy. The resultant multiband feature with varying orbital character as revealed may strongly work against the emergence of the high-temperature superconductivity.

Original languageEnglish
Article number241109
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number24
DOIs
Publication statusPublished - 2011 Dec 19

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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