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Anisotropic Behavior of Knight Shift in Superconducting State of Na_xCoO_2yH_2O
Y. Ihara, K. Ishida, H. Takeya +8
The Co Knight shift was measured in an aligned powder sample of Na_xCoO_2yH_2O, which shows superconductivity at T_c \sim 4.6 K. The Knight-shift components parallel (K_c) and perp…
Valence and Na content dependences of superconductivity in NaxCoO2.yH2O
H. Sakurai, N. Tsujii, O. Suzuki +5
Various samples of sodium cobalt oxyhydrate with relatively large amounts of Na ions were synthesized by a modified soft-chemical process in which a NaOH aqueous solution was…
Superconducting phase diagram of NaxCoO2.yH2O
H. Sakurai, K. Takada, T. Sasaki +1
We synthesized Nax(H3O)zCoO2yH2O samples with various Na/H3O ratios but with the constant Co valence of s = +3.40, and measured their magnetic properties to draw phase diagrams of…
New Misfit-Layered Cobalt Oxide (CaOH)1.14CoO2
M. Shizuya, M. Isobe, Y. Baba +6
We found a new cobalt oxide (CaOH)1.14CoO2 by utilizing the high-pressure technique. X-ray and electron diffraction studies revealed that the compound has layer structure which con…
Metallic conductivity and a Ca substitution study of NaRh2O4 comprising a double chain system
K. Yamaura, Q. Huang, M. Moldovan +3
The metallic compound NaRh2O4 forms a full range solid solution to the insulating phase CaRh2O4. At a Na concentration of 0.25 moles per formula unit, we found an unexpected contri…
Na NMR Study of Layered Superconductor
H. Ohta, C. Michioka, Y. Itoh +5
We measured Na-NMR spectra and nuclear spin-lattice relaxation rates of superconducting and non-superconducting bilayer hydrate (x ~ 0.3, y…