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Phys. Rev. Lett. 99, 247211 (2007) [4 pages]

Magnetoelastic Coupling and Symmetry Breaking in the Frustrated Antiferromagnet alpha-NaMnO2

Maud Giot,1,2 Laurent C. Chapon,2 John Androulakis,1 Mark A. Green,3,4 Paolo G. Radaelli,2 and Alexandros Lappas1
1Institute 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 alpha-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=((1/2),(1/2),0).

©2007 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.99.247211
DOI: 10.1103/PhysRevLett.99.247211
PACS: 75.25.+z; 61.12.Ld; 75.30.Kz; 75.80.+q
  • 75.25.+z
    Spin arrangements in magnetically ordered materials including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc
  • 61.12.Ld
    Neutron diffraction
  • 75.30.Kz
    Magnetic phase boundaries including magnetic transitions, metamagnetism, etc
  • 75.80.+q
    Magnetomechanical and magnetoelectric effects, magnetostriction
  • YEAR: 2007

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