Magnetic anisotropy of NaxCoO2 single crystals

Authors

Dapeng Chen, University of WollongongFollow
Xiaolin Wang, University of WollongongFollow
C T Lin, Max Planck Institute for Solid State Research, GermanyFollow
S X. Dou, University of WollongongFollow

RIS ID

24949

Publication Details

Chen, D, Wang, X, Lin, CT & Dou, SX (2008), Magnetic anisotropy of NaxCoO2 single crystals, Journal of Applied Physics, 103(7), pp. 07C702-1-07C702-3.

Abstract

We report the magnetic properties of single crystals of Na_xCoO₂ (x=0.42, 0.82, and 0.87). The magnetic susceptibility measurements revealed considerable anisotropy along H parallel to ab and H parallel to c for the as-grown single crystals. It was found that an antiferromagnetic transition with a Neel temperature T-_N=21 K occurred for the x=0.82 sample, and there was a paramagnetic phase for the x=0.87 sample over a wide temperature range from 2 to 300 K, but the sample with x=0.42 shows a monotonic increase of chi with increasing temperature above similar to 100 K. In addition, the x=0.82 sample has the largest derived anisotropic g-factor ratio (g_ab/g_c-1.30), whereas the sample with x=0.42 is nearly isotropic (g_ab/g_c-0.96).