92 citations · 373 across the 10 of their papers we have counts for
10 papers
Isotope Effect on the Superconducting Transition Temperature of NaxCoO2.yH2O
Mai Yokoi, Yoshiaki Kobayashi, Masatoshi Sato +1
The effect of the 16O-->18O substitution on the superconducting transition temperatures Tc of NaxCoO2.yH2O has been studied for several sets of samples. Each set has two kinds of s…
NMR studies of Successive Phase Transitions in Na0.5CoO2 and K0.5CoO2
Mai Yokoi, Yoshiaki Kobayashi, Taketo Moyoshi +1
59Co- and 23Na-NMR measurements have been carried out on polycrystalline and c-axis aligned samples of Na0.5CoO2, which exhibits successive transitions at temperatures T = 87 K (=…
Co-NMR Knight Shift of NaxCoO2 \dot yH2O Studied in Both Superconducting Regions of the Tc-nuQ3 Phase Diagram Divided by the Nonsuperconducting Phase
Yoshiaki Kobayashi, Taketo Moyoshi, Mai Yokoi +1
In the temperature (T)-nuQ3 phase diagram of NaxCoO2 \dot yH2O, there exist two superconducting regions of nuQ3 separated by the nonsuperconducting region, where nuQ3 is usually es…
Magnetic properties of superconducting cobalt oxides NaxCoO2.yH2O
Yoshiaki Kobayashi, Taketo Moyoshi, Hidekazu Watanabe +2
Studies of the NMR Knight shift K of Na0.3CoO2.yH2O have been carried out in detail. The suppression of K by the occurrence of the superconductivity reported previously by the pres…
Magnetic and Metal-Insulator Transitions in beta-Na0.5CoO2 and gamma-K0.5CoO2 -NMR and Neutron Diffraction Studies-
H. Watanabe, Y. Mori, M. Yokoi +7
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 su…
Magnetic Correlation of NaxCoO2 and Successive Phase Transitions of Na0.5CoO2 -NMR and Neutron Diffraction Studies-
Mai Yokoi, Taketo Moyoshi, Yoshiaki Kobayashi +4
Data taken by various kinds of methods including NMR/NQR and neutron scattering are presented for NaxCoO2, in particular, for Na0.5CoO2. Attentions have also been paid to the x dep…