Magnetic Susceptibility of Li1+xTi2-xO4 Doped with Vanadium

Magnetic susceptibility of Li 1+ x Ti 2- x O 4 doped with V by 5% was measured from 90 to 300 K. It was analyzed as a sum of those of the host lattice and the resolved V. The susceptibility of V obeys the Curie-Weiss law. The effective Bohr magneton number is 2.4–2.8/V and the Weiss temperature is as low as 20 K. They suggest that the bipolaron state does not appear in the host lattice. To explain the nearly temperature independent paramagnetism of the host lattice, spin degeneracy of locally extended electron orbitals was proposed.