Electronic structure of the three-dimensional colossal magnetoresistive perovskite La(1-x)Sr(x)MnO3 has been established using soft-x-ray angle-resolved photoemission spectroscopy with its intrinsically sharp definition of three-dimensional electron momentum. The experimental results show much weaker polaronic coupling compared to the bilayer manganites and are consistent with the theoretical band structure including the empirical Hubbard parameter U. The experimental Fermi surface unveils the canonical topology of alternating three-dimensional electron spheres and hole cubes, with their shadow contours manifesting the rhombohedral lattice distortion. This picture has been confirmed by one-step photoemission calculations including displacement of the apical oxygen atoms. The rhombohedral distortion is neutral to the Jahn-Teller effect and thus polaronic coupling, but affects the double-exchange electron hopping and thus the colossal magnetoresistance effect.

Department Chemie Ludwig Maximilians Universität München 81377 Munich Germany

Institut für Materialchemie Technische Universität Wien A 1060 Wien Austria

National Research Centre Kurchatov Institute 123182 Moscow Russia

New Technologies Research Center University of West Bohemia 306 14 Plzen Czech Republic

RIKEN Center for Emergent Matter Science 2 1 Hirosawa Wako Saitama 351 0198 Japan

Swiss Light Source Paul Scherrer Institute 5232 Villigen Switzerland

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