Micro- and macroscopic magnetism on layered cobalt dioxide Li&lt;sub&gt;&lt;em&gt;x&lt;/em&gt;&lt;/sub&gt;CoO&lt;sub&gt;2&lt;/sub&gt; (0.1⩽&lt;em&gt;x&lt;/em&gt;⩽1)

Mukai, Kazuhiko; Sugiyama, Jun; Ikedo, Yutaka; Andreica, Daniel; Amato, Alex; Brewer, Jess H.; Ansaldo, Eduardo J.; Russo, Peter L.; Chow, Kim H.; Ariyoshi, Kingo; Ohzuku, Tsutomu

doi:10.1016/j.jpcs.2007.09.014

Micro- and macroscopic magnetism on layered cobalt dioxide Li_xCoO₂ (0.1⩽x⩽1)

Mukai K, Sugiyama J, Ikedo Y, Andreica D, Amato A, Brewer JH, Ansaldo EJ, Russo PL, Chow KH, Ariyoshi K & Ohzuku T

Citation

Mukai, K., Sugiyama, J., Ikedo, Y., Andreica, D., Amato, A., Brewer, J. H., … Ohzuku, T. (2008). Micro- and macroscopic magnetism on layered cobalt dioxide Li_xCoO₂ (0.1⩽x⩽1). Journal of Physics and Chemistry of Solids, 69(5-6), 1479-1482. https://doi.org/10.1016/j.jpcs.2007.09.014

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:18974

The magnetism for the electrochemically prepared Li_xCoO₂ samples with 0.1⩽x⩽1 was investigated by muon-spin rotation/relaxation (μSR) and susceptibility (χ) measurements. The χ(T) curves with H=10 kOe, which correspond to the change in macroscopic magnetism, are almost T-independent down to ∼50 K for the x⩽0.44 samples, suggesting that the samples in this x range are Pauli-paramagnetic. For the samples with 0.49⩽x⩽3/4, a cusp is, however, observed around 170 K in their χ(T) curve. Since there are no anomalies in the μSR parameters around 170 K and μSR is sensitive to local magnetic nature, the cusp is most unlikely due to a magnetic transition, but either a spin state transition or a structural phase transition. Furthermore, zero-field μSR time spectra for all the samples mainly show a slow Kubo–Toyabe behavior, indicating that muon spin is mainly depolarized by randomly oriented nuclear moments of ⁷Li and ⁵⁹Co. Hence, it was clarified that all the Li_xCoO₂ samples with x<1 are paramagnetic even at 1.8 K, in contrast to Na_xCoO₂ and K_xCoO₂.