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Co-oxides beta-Na0.5CoO2 and gamma-K0.5CoO2 have been prepared by the Nade-intercalation from alpha-NaCoO2 and by the floating-zone method,respectively. It has been found that successive phase transitions take place attemperatures Tc1 and Tc2 in both systems. The appearance of the internalmagnetic field at Tc1 with decreasing temperature T indicates that theantiferromagnetic order exists at T < Tc1, as in gamma-Na0.5CoO2. Forbeta-Na0.5CoO2, the transition temperatures and the NMR parameters determinedfrom the data taken for magnetically ordered state are similar to those ofgamma-Na0.5CoO2, indicating that the difference of the stacking ways of theCoO2 layers between these systems do not significantly affect their physicalproperties. For gamma-K0.5CoO2, the quantitative difference of the physicalquantities are found from those of beta- and gamma-Na0.5CoO2. The differencebetween the values of Tci (i = 1 and 2) of these systems might be explained byconsidering the distance between CoO2 layers.Comment: 8 pages, 14 figures, 1 Tabl

Magnetic and Metal–Insulator Transitions in β-Na0.5CoO2and γ-K0.5CoO2–NMR and Neutron Diffraction Studies–

Magnetic and Metal–Insulator Transitions in β-Na_0.5CoO₂and γ-K_0.5CoO₂–NMR and Neutron Diffraction Studies–