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We have investigated the (0001) surfaces of several hexagonal manganiteperovskites by low-energy electron diffraction (LEED) in order to determine ifthe surface periodicity is different from that of the bulk materials. TheseLEED studies were conducted using near-normal incidence geometry with a lowenergy electron microscope (LEEM)/LEED apparatus from room temperature to 1200degrees Celsius and with an electron energy in the range of 15-50 eV.Diffraction patterns showed features of bulk-terminated periodicity as well asa 2\times2 surface reconstruction. Possible origins for this surfacereconstruction structure are discussed and comparisons are made with surfacestudies of other complex oxides.

Surface Reconstruction of Hexagonal Y-doped HoMnO3 and LuMnO3 studied using low-energy electron diffraction