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The physical properties of manganites depend strongly on sample morphology,probably due to strain. We investigate the influence of NdGaO3 substrates onthe limit of the ferromagnetic-metallic phase field in La1-xCaxMnO3, dopingwith x=1% resolution. Films with x=0.40 show a metal-insulator transition, butthe ferromagnetic volume fraction is half the spin aligned value. Films withx=0.41 are similar but the metal-insulator transition is not always seen. Filmswith x=0.42, 0.43, 0.44, 0.45 are insulating, and the magnetization isdramatically reduced. The observed phase boundary indicates where to search forenhanced phase separation effects that may be exploited in thin films anddevices

High resolution determination of ferromagnetic metallic limit in epitaxial La1−xCaxMnO3 films on NdGaO3