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Abstract:
The electronic structure of the layered 4d transition metal oxide
Sr2RhO4 is investigated by angle resolved photoemission. We find
well-defined quasiparticle excitations with a highly anisotropic
dispersion, suggesting a quasi-two-dimensional Fermi-liquid-like ground
state. Markedly different from the isostructural Sr2RuO4, only two bands
with dominant Rh 4d(xz,zy) character contribute to the Fermi surface. A
quantitative analysis of the photoemission quasiparticle band structure
is in excellent agreement with bulk data. In contrast, it is found that
state-of-the-art density functional calculations in the local density
approximation differ significantly from the experimental findings.
