H. Sakurai

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…

cond-mat.supr-con2005★ 41 cited

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…

cond-mat.supr-con2005★ 8 cited

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…

cond-mat.supr-con2005★ 1 cited

$^{23}$ Na NMR Study of Layered Superconductor $N a_{x} C o O_{2} - y H_{2} O$

H. Ohta, C. Michioka, Y. Itoh +5

We measured $^{23}$ Na-NMR spectra and nuclear spin-lattice relaxation rates $^{23} (1/ T_{1})$ of superconducting and non-superconducting bilayer hydrate $N a_{x} C o O_{2} - y H_{2} O$ (x ~ 0.3, y…

cond-mat.supr-con2004★ 52 cited

Weak Magnetic Order in the Bilayered-hydrate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O Structure Probed by Co Nuclear Quadrupole Resonance - Proposed Phase Diagram in Superconducting Na $_{x}$ CoO $_{2} \cdot$ $y$ H $_{2}$ O

Y. Ihara, K. Ishida, C. Michioka +6

A weak magnetic order was found in a non-superconducting bilayered-hydrate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O sample by a Co Nuclear Quadrupole Resonance (NQR) measurement. The nucle…

cond-mat.supr-con2004★ 20 cited

Correlation between Superconducting Transition Temperature $T_{c}$ and Increase of Nuclear Spin-Lattice Relaxation Rate Devided by Temperature $1/ T_{1} T$ at $T_{c}$ in the Hydrate Cobaltate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O

Y. Ihara, K. Ishida, C. Michioka +6

We have performed Co-nuclear quadrupole resonance (NQR) studies on Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O compounds with different Na ( $x$ ) and hydrate ( $y$ ) contents. Two samples with d…

cond-mat.supr-con2003★ 13 cited

The role of the water molecules in novel superconductor, Na $_{0.35}$ CoO $_{2} \cdot$ 1.3H $_{2}$ O

H. Sakurai, K. Takada, F. Izumi +3

In order to investigate the role of the water molecules in Na $_{0.35}$ CoO $_{2} \cdot$ 1.3H $_{2}$ O, we synthesized superconducting Na $_{0.35}$ CoO $_{2} \cdot$ 1.3H $_{2}$ O and nonsupercon…

cond-mat.supr-con2003★ 40 cited

Possible Spin-triplet Superconductivity in NaxCoO2yH2O - 59Co NMR Study

M. Kato, C. Michioka, T. Waki +7

We report 59Co NMR studies on the magnetically oriented powder samples of Co-oxide superconductors NaxCoO2yH2O with Tc ~ 4.7 K. From two-dimensional powder pattern in the NMR spect…

Anisotropic Behavior of Knight Shift in Superconducting State of Na_xCoO_2yH_2O

Valence and Na content dependences of superconductivity in NaxCoO2.yH2O

Superconducting phase diagram of NaxCoO2.yH2O

23Na NMR Study of Layered Superconductor Nax​CoO2​−yH2​O

Weak Magnetic Order in the Bilayered-hydrate Nax​CoO2​⋅yH2​O Structure Probed by Co Nuclear Quadrupole Resonance - Proposed Phase Diagram in Superconducting Nax​CoO2​⋅ yH2​O

Correlation between Superconducting Transition Temperature Tc​ and Increase of Nuclear Spin-Lattice Relaxation Rate Devided by Temperature 1/T1​T at Tc​ in the Hydrate Cobaltate Nax​CoO2​⋅yH2​O

The role of the water molecules in novel superconductor, Na0.35​CoO2​⋅1.3H2​O

Possible Spin-triplet Superconductivity in NaxCoO2yH2O - 59Co NMR Study

$^{23}$ Na NMR Study of Layered Superconductor $N a_{x} C o O_{2} - y H_{2} O$

Weak Magnetic Order in the Bilayered-hydrate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O Structure Probed by Co Nuclear Quadrupole Resonance - Proposed Phase Diagram in Superconducting Na $_{x}$ CoO $_{2} \cdot$ $y$ H $_{2}$ O

Correlation between Superconducting Transition Temperature $T_{c}$ and Increase of Nuclear Spin-Lattice Relaxation Rate Devided by Temperature $1/ T_{1} T$ at $T_{c}$ in the Hydrate Cobaltate Na $_{x}$ CoO $_{2} \cdot y$ H $_{2}$ O

The role of the water molecules in novel superconductor, Na $_{0.35}$ CoO $_{2} \cdot$ 1.3H $_{2}$ O