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• W2006351338 endingPage "3056" @default.
• W2006351338 startingPage "3046" @default.
• W2006351338 abstract "Data taken by various methods including NMR/NQR and neutron scattering are presented for Na x CoO 2 , particularly Na 0.5 CoO 2 . Attention has also been paid to the x dependence of the electronic nature of this system. The pseudo-gap-like behavior observed in the region of x < x c ∼0.6 is emphasized. For samples with x ≤0.6, signals from two kinds of Co sites with different quadrupole frequencies ν Q of ∼4.1 and ∼2.8 MHz were observed, and the former ν Q , which is nearly equal to that of the superconducting system Na 0.3 CoO 2 · y H 2 O, becomes dominant with decreasing x to 0.3. For Na 0.5 CoO 2 , the Co sites with the larger ν Q have larger magnetic moments. They align antiferromagnetically at T c1 ∼87 K with their direction within the plane, while the Co sites with the smaller ν Q have smaller moments. They align in the direction parallel to the c axis. The ordered moments at the two distinct sites exhibit the same T -dependence, indicating that the existence of these sites is not due to macroscopic phase separation. Although we have observed the splitting of the zero-field NMR signals from Co sites with smaller ν Q at the second transition temperature T c2 ∼53 K, any other anomaly of the ordered magnetization has not been observed at T c2 in the T -dependences of neutron and NMR data. As x decreases, the two-dimensional nature of the electrons is enhanced and the antiferromagnetic correlation increases. On the basis of these results, the superconducting pair state in Na 0.3 CoO 2 · y H 2 O is discussed." @default.
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• W2006351338 date "2005-11-15" @default.
• W2006351338 modified "2023-10-13" @default.
• W2006351338 title "Magnetic Correlation of Na_<i>x</i>CoO₂and Successive Phase Transitions of Na_0.5CoO₂–NMR and Neutron Diffraction Studies–" @default.
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• W2006351338 doi "https://doi.org/10.1143/jpsj.74.3046" @default.
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