Peculiarities of magnetic behavior of crystals Pb 3Mn 7O 15 doped by Fe, Ga, Ge ions

Structure and magnetic properties of Pb 3(Mn 1-xFe x) 7O 15 with х = 0, x = 0.05, х = 0.1, х = 0.15 and х = 0.2 and Pb 3(Mn 0.9 5Ge 0. 05) JO 15, Pb 3(Mn 0. 95Ga 0, 05) JO 15 single crystals, grown by spontaneous crystallization from solution in melt, are investigated. All grown crystals belong to the hexagonal space group P6 3/mcm. The magnetic properties appeared to be heavily dependent on the level of doping by diamagnetic Ga and Ge ions, as well as by paramagnetic Fe ions. The authors show also the revealed destruction of 3-D magnetic ordering during doping by Ga ions and by Fe ions in the quantity of x > 0.1.