17-O NMR studies of a triangular-lattice superconductor Na{x}CoO{2}yH{2}O

Abstract

We report the first 17-O NMR studies of a triangular-lattice superconductor Na{1/3}CoO{2}-[4/3]H{2}O and the host material Na{x}CoO{2} (x=0.35 and 0.72). Knight shift measurements reveal that p-d hybridization induces sizable spin polarization in the O triangular-lattice layers. Water-intercalation makes CoO{2} planes homogeneous, and enhances low frequency spin fluctuations near T{c}=4.5 K at some finite wave-vectors different from both the ferromagnetic and ``120 degree'' modes.

4 pages, 4 figures. Revised manuscript accepted for publication in Phys. Rev. Lett

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• Three-Dimensional Spin Fluctuations in Na0.75CoO2
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• 77Se NMR Investigation of the K(x)Fe(2-y)Se(2) High Tc Superconductor (Tc=33K)
• Electronic Correlations in CoO2, the Parent Compound of Triangular Cobaltates
• Spin correlations and cobalt charge states: A new phase diagram of sodium cobaltates
• Ultrathin 2D-oxides: a perspective on fabrication, structure, defect, transport, electron and phonon properties
• A unified origin for the 3D magnetism and superconductivity in Na${}_x$CoO${}_2$
• Unconventional Superconductivity Induced by Quantum Critical Fluctuations in Hydrate Cobaltate Na${}_x$(H${}_3$O)${}_z$CoO${}_x\cdot$ $y$H${}_2$O -- Relationship between Magnetic Fluctuations and the Superconductivity Revealed by a Co Nuclear Quadrupole Resonance --
• Electron-Phonon mechanism for Superconductivity in Na${}_{0.35}$CoO${}_2$: Valence-Band Suhl-Kondo effect Driven by Shear Phonons
• ${}^{17}$O NMR Measurements on Superconducting Na${}_{0.35}$CoO${}_2\cdot y$H${}_2$O
• Anisotropic Behavior of Knight Shift in Superconducting State of Na_xCoO_2yH_2O
• CoO2-Layer-Thickness Dependence of Magnetic Properties and Possible Two Different Superconducting States in NaxCoO2.yH2O
• Search for Magnetic Excitation Spectra of NaxCoO2.yD2O -Neutron Scattering-
• Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates
• Evidence for Oxygen Holes due to d-p Rehybridization in Thermoelectric Sr_{1-x}Rh_{2}O_{4}