Magnetic inhomogeneities in electron-doped Ca1-xLaxMnO3

We present the results of a neutron scattering investigation of Ca1-xLaxMnO3 in the electron-doped (x∼0) regime. For light electron-doping, FM clusters ∼10 A in diameter are identified in a liquid-like distribution within the G-AFM matrix. This mirrors behavior in the hole-doped (x∼1) regime. These clusters are not long-range correlated for x≤0.05, however, for 0.05≤x≤0.10, a spontaneous long-range FM moment is observed. This seems to be due to the formation of a 'spin glass' of overlapping clusters, as opposed to either the long-range delocalization of doped electrons or long-range phase separation into electron-rich FM and electron-poor AFM regions