Suppression of the long-range magnetic order in Pb3(Mn1−xFex)7O15 upon substitution of Fe for Mn

Structure and magnetic properties of Pb3(Mn1−xFex)7O15 single crystals with х=0-0.2 grown by spontaneous crystallization from solution in melt have been investigated. All the crystals belong to the hexagonal space group P63/mcm. The magnetic properties appeared to be strongly dependent on the iron doping level. At small (х=0.05) dopant concentrations, the value of magnetization and Neel temperature TN decrease insignificantly (TN=70 K). With increasing х, the three-dimensional magnetic ordering does not occur and temperature dependences of magnetization at х≥0.1 exhibit spin-glass-like features in the low-temperature region.