2003/12/31 by A. T. Boothroyd, R. Coldea, D. A. Tennant +5 · 9 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Computer science #Condensed matter physics #Crystal (programming language) #Diffraction #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Materials science #Nuclear magnetic resonance #Optics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Reciprocal lattice #Spectral line #Spin (aerodynamics) #Thermodynamics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.92.197201
published as Phys. Rev. Lett. 92, 197201 (2004) · 5 pages, 4 figures; revised version to be published in Physical Review Letters
arxiv created 2004/04/15 · openalex publication_date 2004/05/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 ( approximately 10 meV), which is localized in wave vector 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.