Magnetic and metal-insulator transitions in β-Na0.5CoO2 and γ-K0.5CoO2 -: NMR and neutron diffraction studies

被引:20
作者
Watanabe, H [1 ]
Mori, Y
Yokoi, M
Moyoshi, T
Soda, M
Yasui, Y
Kobayashi, Y
Sato, M
Igawa, N
Kakurai, K
机构
[1] Nagoya Univ, Div Mat Sci, Dept Phys, Chikusa Ku, Nagoya, Aichi 4648602, Japan
[2] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Naka, Ibaraki 3191195, Japan
关键词
Na0.5CoO2; K0.5CoO2; NMR; X-ray and neutron diffractions;
D O I
10.1143/JPSJ.75.034716
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Co-oxides beta-Na0.5CoO2 and gamma-K0.5CoO2 have been prepared by the Na de-intercalation from alpha-NaCoO2 and by the floating-zone method, respectively. It has been found that successive phase transitions take place at temperatures T-cl and T-c2 in both systems. The appearance of the internal magnetic field at T-cl with decreasing temperature T indicates that the anti ferromagnetic order exists at T <= Tj, as in gamma-Na0.5CoO2. For beta-Na0.5CoO2, the transition temperatures and the NMR parameters determined from the data taken for magnetically ordered state are similar to those of gamma-Na0.5CoO2, indicating that the difference of the stacking ways of the CoO2 layers between these systems do not significantly affect their physical properties. For gamma-K0.5CoO2 the quantitative difference of the physical quantities are found from those of beta- and gamma-Na0.5CoO2. The difference between the values of T-ci (i = 1 and 2) of these systems might be explained by considering the distance between CoO2 layers.
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页数:8
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