  We investigated electrical and magnetic properties of the electron-doped
manganites Ca1-xSmxMnO3 (0<x<0.2). Our results indicate the possibility of
phase separation in electron doped manganites. The compounds with x = 0.13-0.15
show unusual difference between zero-field cooled and field-cooled
resistivities which are not observed in lower compositions. Our results suggest
that electronic phase separation alone is insufficient to understand the origin
of the resistivity irreversibilities.
