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After years of research into colossal magnetoresistant (CMR) manganites usingbulk techniques, there has been a recent upsurge in experiments directlyprobing the electronic states at or near the surface of the bilayer CMRmaterials La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ using angle-resolved photoemissionor scanning probe microscopy. Here we report new, temperature dependent, angleresolved photoemission data from single crystals with a doping level of$x=0.36$. The first important result is that there is no sign of a pseudogap inthe charge channel of this material for temperatures below the Curietemperature $T_C$. The second important result concerns the temperaturedependence of the electronic states. The temperature dependent changes in theFermi surface spectra both at the zone face and zone diagonal regions in$k$-space indicate that the coherent quasiparticle weight disappears fortemperatures significantly above $T_C$, and that the $k$-dependence of theT-induced changes in the spectra invalidate an interpretation of these data interms of the superposition of a `universal' metallic spectrum and an insulatingspectrum whose relative weight changes with temperature. In this sense, ourdata are not compatible with a phase separation scenario.

physical review. b, condensed matter and materials physics

Non-gapped Fermi surfaces, quasiparticles and the anomalous temperature  dependence of the near-$E_F$ electronic states in the CMR oxide  La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ with $x=0.36$