Frustrated magnetism in the two-dimensional triangular lattice of LixCoO2

For Li-deficient LixCoO2 samples, Tcon decreases with decreasing x from 50 K for x=0.95 to 25 K for x=0.7. The volume fraction of the magnetic phase is however almost independent of x and is estimated as 20% at 1.8 K, but no oscillations were observed in the zero field spectrum.