H. Sakurai

activity

20032005

collaborators

9 papers

cond-mat.supr-con2005

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…

cond-mat.supr-con2005

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

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

$^{23}$ 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

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.str-el2004

Magnetic Fluctuations in the Metallic State of Na $_{0.7}$ CoO $_{2}$ Revealed by $^{23}$ Na NMR

Y. Ihara, K. Ishida, C. Michioka +4

Nuclear-magnetic-resonance (NMR) studies were performed in Na $_{0.7}$ CoO $_{2}$ to investigate its magnetic properties from the microscopic point of view. Na $_{0.7}$ CoO $_{2}$ is a start…

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

Magnetic Fluctuations in the Metallic State of Na0.7​CoO2​ Revealed by 23Na NMR

$^{23}$ 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

Magnetic Fluctuations in the Metallic State of Na $_{0.7}$ CoO $_{2}$ Revealed by $^{23}$ Na NMR