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Orbital characters of three-dimensional Fermi surfaces in Eu2−xSrxNiO4as 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 (+4 others)
2011 Physical Review B  

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2011 pre-print arXiv:1112.2259v1 fatcat:c5f62pjwebgc7fqb7g5ezxy2bi
The three-dimensional Fermi surface structure of hole-doped metallic layered nickelate Eu2-xSrxNiO4 (x=1.1), an important counterpart to the isostructural superconducting cuprate La2-xSrxCuO4, 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 Gamma-centered 3z2-r2-derived small electron pocket. This finding demonstrates that in the layered nickelate the 3z2-r2
more » ... d resides close to the x2-y2 one in energy. The resultant multi-band feature with varying orbital character as revealed may strongly work against the emergence of the high-temperature superconductivity.
doi:10.1103/physrevb.84.241109 fatcat:7ll3xelvvrgw7e4g6vh5jktoqa
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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. "Orbital characters of three-dimensional Fermi surfaces in Eu2−xSrxNiO4as probed by soft-x-ray angle-resolved photoemission spectroscopy." Physical Review B 84.24 (2011)