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Orbital characters of three-dimensional Fermi surfaces in Eu2-xSrxNiO4
as probed by soft-x-ray angle-resolved photoemission spectroscopy
release_c5f62pjwebgc7fqb7g5ezxy2bi
by
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
(+3 others)
Released
as a article
.
2011
Abstract
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 band 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.
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1112.2259v1
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