Microscopic magnetic nature of layered cobalt dioxides investigated by muon-spin rotation and relaxation

Sugiyama, Jun; Ikedo, Yutaka; Mukai, Kazuhiko; Nozaki, Hiroshi; Russo, Peter L.; Ansaldo, Eduardo J.; Brewer, Jess H.; Andreica, Daniel; Amato, Alex

doi:10.1016/j.nima.2008.11.049

Microscopic magnetic nature of layered cobalt dioxides investigated by muon-spin rotation and relaxation

Sugiyama J, Ikedo Y, Mukai K, Nozaki H, Russo PL, Ansaldo EJ, Brewer JH, Andreica D & Amato A

Citation

Sugiyama, J., Ikedo, Y., Mukai, K., Nozaki, H., Russo, P. L., Ansaldo, E. J., … Amato, A. (2009). Microscopic magnetic nature of layered cobalt dioxides investigated by muon-spin rotation and relaxation. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 600(1), 305-308. https://doi.org/10.1016/j.nima.2008.11.049

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:17282

In order to elucidate the nature of layered cobalt dioxides A_xCoO₂, we have investigated their microscopic magnetism by means of positive muon-spin rotation and relaxation (μ⁺SR) spectroscopy, in particular for A=Li, Na, and K. The dome-shaped magnetic phase diagram for Na_xCoO₂ with x⩾0.75 suggests the competition between the spin concentration and geometrical frustration on the two-dimensional triangular lattice of the CoO₂ plane. The additional experiment on Li_xCoO₂ and K_xCoO₂ indicates both a weakly coupled regime for the d electrons in the CoO₂ plane and an ignorable weak effect of the inter-plane interaction on their magnetic order at low T.