Author/Authors :
Sugiyama، نويسنده , , Jun and Ikedo، نويسنده , , Yutaka and Mukai، نويسنده , , Kazuhiko and Nozaki، نويسنده , , Hiroshi and Russo، نويسنده , , Peter L. and Ansaldo، نويسنده , , Eduardo J. and Brewer، نويسنده , , Jess H. and Andreica، نويسنده , , Daniel and Amato، نويسنده , , Alex، نويسنده ,
Abstract :
In order to elucidate the nature of layered cobalt dioxides AxCoO2, 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 NaxCoO2 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 LixCoO2 and KxCoO2 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.
Keywords :
Layered cobalt oxides , Triangular Lattice , Muon-spin rotation and relaxation , Thermoelectrics
