Structural evolution of MnTi0·8Ru0·2O3

Here, we present the structural studies on MnTi1-xRuxO3(x = 0, 0.2) compounds. The role of Ti ions in the magnetism of MnTiO3 was unclear so here this issue has been tried to address. The magnetic susceptibility (χ) data shows that the 3-dimensional magnetic character has been improved in the doped MnTiO3. The x = 0 compound goes paramagnetic to antiferromagnetic phase at a temperature ∼64 K followed by a broad peak at a temperature ∼100 K. But in x = 0.2 compound, the antiferromagnetic transition temperature has been shifted towards the lower temperature to ∼47.5 K with a broad peak at temperature ∼79 K. On the doping of Ru at Ti site a sharp anomaly in the temperature dependent magnetic susceptibility (χ) measurement is observed ∼47.5 K in the case of x = 0.2 compound. This sharp anomaly is attributed to the improved 3D character of magnetism which arises because of the direct exchange interaction between Mn-Ti/Ru ions in addition to the inter-layer super superexchange interaction between Mn-Mn ions via two intervening oxygen ions. It is interesting to note that even though the TN and T2D are at low temperatures compared to the x = 0 compound, the onset temperature of these two temperatures occurs at much higher temperature than as observed in x = 0 compound.