  The conductive domain wall (CDW) is extensively investigated in
ferroelectrics, which can be considered as a quasi-two-dimensional
reconfigurable conducting channel embedded into an insulating material.
Therefore, it is highly important for the application of ferroelectric
nanoelectronics. Hitherto, most CDW investigations are restricted in oxides,
and limited work has been reported in non-oxides to the contrary. Here, by
successfully synthesizing the non-oxide ferroelectric Sn2P2S6 single crystal,
we observed and confirmed the domain wall conductivity by using different
scanning probe techniques which origins from the nature of inclined domain
walls. Moreover, the domains separated by CDW also exhibit distinguishable
electrical conductivity due to the interfacial polarization charge with
opposite signs. The result provides a novel platform for understanding
electrical conductivity behavior of the domains and domain walls in non-oxide
ferroelectrics.
