Ferromagnetic in-plane spin fluctuations in NaxCoO2 observed by neutron inelastic scattering

Details Ferromagnetic in-plane spin fluctuations in NaxCoO2 observed by neutron inelastic scattering Ferromagnetic in-plane spin fluctuations in NaxCoO2 observed by neutron inelastic scattering

2003-12-22

arxiv.org/abs/cond-mat/0312589v2

Phys. Rev. Lett. 92, 197201 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures; revised version to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.92.197201

We present neutron scattering spectra taken from a single crystal of Na0.75CoO2, the precursor to a novel cobalt-oxide superconductor. The data contain a prominent inelastic signal at low energies (~10 meV), which is localized in wavevector about the origin of two-dimensional reciprocal space. The signal is highly dispersive, and decreases in intensity with increasing temperature. We interpret these observations as direct evidence for the existence of ferromagnetic spin fluctuations within the cobalt-oxygen layers.

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