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Thin-film colossal magnetoresistance manganites such asLa$_{0.67}$Ca$_{0.33}$MnO$_{3}$ (LCMO) have now been intensely studied for morethan a decade, but the issue of possible nanoscale electronic phase separationis not fully solved. Scanning Tunneling Microscopy / Spectroscopy (STS) hasbeen pivotal in studying phase separation, but is hindered by being surface-rather than bulk-sensitive. For our sputtered LCMO films the data indicates astrong correlation between surface morphology and signatures of phaseseparation; rough films show phase separation while atomically flat films areelectronically homogeneous but have a more or less inactive surface layer.Regardless of surface morphology, the film bulk is electronically andmagnetically active. Many of the reported conclusions about electronicinhomogeneities measured by STS have been confused by this issue. We study bothstrained and unstrained films and find no correlation between substrate-inducedstrain and either electronic phase separation or dead layers.

Correlations between the morphology and the electronic structure at the surface of thin film manganites, investigated with STM