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We report on experimental data of the three-dimensional bulk Fermi surfacesof the layered strongly correlated Ca1.5Sr0.5RuO4 system. The measurements havebeen performed by means of hn-depndent bulk-sensitive soft x-ray angle-resolvedphotoemission technique. Our experimental data evinces the bulk Fermi surfacetopology at kz~0 to be qualitatively different from the one observed bysurface-sensitive low-energy ARPES. Furthermore, stronger kz dispersion of thecircle-like gamma Fermi surface sheet is observed compared with Sr2RuO4. Thusin the paramagnetic metal phase, Ca1.5Sr0.5RuO4 compound is found to haverather three-dimensional electronic structure.

Three-Dimensional Bulk Electronic Structures of Ca1.5Sr0.5RuO4 Studied by Soft X-ray Angle-Resolved Photoemission