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APS » Journals » Phys. Rev. Lett. » Volume 92 » Issue 19
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Phys. Rev. Lett. 92, 197201 (2004) [4 pages]

Ferromagnetic In-Plane Spin Fluctuations in NaxCoO2 Observed by Neutron Inelastic Scattering

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A. T. Boothroyd1,*, R. Coldea1, D. A. Tennant2, D. Prabhakaran1, L. M. Helme1, and C. D. Frost3
1Department of Physics, Oxford University, Oxford, OX1 3PU, United Kingdom
2School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife, KY16 9SS, United Kingdom
3ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, United Kingdom

Received 23 December 2003; published 13 May 2004

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 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.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.197201
DOI:
10.1103/PhysRevLett.92.197201
PACS:
75.40.Gb, 74.20.Mn, 74.25.Ha, 78.70.Nx

*Electronic address: a.boothroyd1@physics.ox.ac.uk

URL: http://xray.physics.ox.ac.uk/Boothroyd

 
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