Magnetic Transitions in Ti2O3 and V2O3

The principal susceptibilities of single crystals of ${\mathrm{Ti}}_2{\mathrm{O}}_3$ and ${\mathrm{V}}_2{\mathrm{O}}_3$ have been measured from 4.2°K to 300°K by means of a vibrating sample magnetometer. In ${\mathrm{Ti}}_2{\mathrm{O}}_3$ , ${}_{\mathrm{\chi \parallel }}{\text{\hspace{0.17em}=\hspace{0.17em}9×10}}^{\text{−7}}\hspace{0.17em}\mathrm{cgs}/\mathrm{g}$ and ${}_{\mathrm{\chi \perp }}{\text{\hspace{0.17em}=\hspace{0.17em}8×10}}^{\text{−7}}\hspace{0.17em}\mathrm{cgs}/\mathrm{g}$ , and both susceptibilities are nearly temperature independent. In ${\mathrm{V}}_2{\mathrm{O}}_3$ , below the transition temperature $T_0$ , ${}_{\mathrm{\chi \parallel }}{\text{\hspace{0.17em}=\hspace{0.17em}6.9×10}}^{\text{−6}}\hspace{0.17em}\mathrm{cgs}/\mathrm{g}$ and ${}_{\mathrm{\chi \perp }}{\text{\hspace{0.17em}=\hspace{0.17em}5.9×10}}^{\text{−6}}\hspace{0.17em}\mathrm{cgs}/\mathrm{g}$ and both are temperature independent. The small, almost equal, and temperature independent values of both ${}_{\mathrm{\chi \parallel }}$ and ${}_{\mathrm{\chi \perp }}$ below $T_0$ confirm recent neutron diffraction data which indicate no appreciable long-range antiferromagnetic order for these oxides. Van Vleck temperature independent paramagnetism can account for the observed values. It is concluded that the observed discontinuities of susceptibility and corresponding electrical conductivity changes are not due to long-range magnetic ordering effects.