Phys. Rev. Lett. 103, 077202 (2009) [4 pages]
One-Dimensional Magnetic Fluctuations in the Spin-2 Triangular Lattice  -NaMnO2
Abstract
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C. Stock, 1 L. C. Chapon, 1 O. Adamopoulos, 2,3 A. Lappas, 2 M. Giot, 1,2 J. W. Taylor, 1 M. A. Green, 4,5 C. M. Brown, 4 and P. G. Radaelli11ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxon, OX11 0QX, United Kingdom
2Institute for Electronic Structure and Laser, Foundation of Research and Technology-Hellas, Vassilika Vouton, 71110 Heraklion, Greece
3Department of Chemistry, University of Crete, Voutes, 71003 Heraklion, Greece
4NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, Maryland 20899-6102, USA
5Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA
Received 30 January 2009; published 11 August 2009
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45 K with opening of a spin gap. The spectral weight of the magnetic dynamics above the gap (
7.5 meV) has been analyzed by the single-mode approximation. Excellent agreement with the experiment is achieved when a dominant exchange interaction (|J|/kB
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