Phys. Rev. Lett. 99, 247211 (2007) [4 pages]
Magnetoelastic Coupling and Symmetry Breaking in the Frustrated Antiferromagnet -NaMnO2
Abstract
References (27)
Citing Articles
Maud Giot, 1,2 Laurent C. Chapon, 2 John Androulakis, 1 Mark A. Green, 3,4 Paolo G. Radaelli, 2 and Alexandros Lappas11Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, Vassilika Vouton, 71110 Heraklion, Greece
2ISIS, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Chilton-Didcot, OX11 0QX, Oxfordshire, United Kingdom
3NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, Maryland 20899-8562, USA
4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA
Received 1 August 2007; published 14 December 2007
The magnetic and crystal structures of the -NaMnO2 have been determined by high-resolution neutron powder diffraction. The system maps out a frustrated triangular spin lattice with anisotropic interactions that displays two-dimensional spin correlations below 200 K. Magnetic frustration is lifted through magneto-elastic coupling, evidenced by strong anisotropic broadening of the diffraction profiles at high temperature and ultimately by a structural phase transition at 45 K. In this low-temperature regime a three-dimensional antiferromagnetic state is observed with a propagation vector k=( , ,0).
©2007 The American Physical Society
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