One-dimensional magnetic fluctuations in the spin-2 triangular lattice α-NaMnO2

Stock, C., Chapon, L.C., Adamopoulos, O., Lappas, A., Giot, M., Taylor, J.W., Green, M.A., Brown, C.M., Radaelli, P.G. (2009) One-dimensional magnetic fluctuations in the spin-2 triangular lattice α-NaMnO2. Physical Review Letters, 103 (7). 0-0. ISSN 0031-9007. (doi:10.1103/PhysRevLett.103.077202) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1103/PhysRevLett.103.077202

Abstract

The S=2 anisotropic triangular lattice α-NaMnO2 is studied by neutron inelastic scattering. Antiferromagnetic order occurs at Tâ?¤45K with opening of a spin gap. The spectral weight of the magnetic dynamics above the gap (Î?7.5meV) has been analyzed by the single-mode approximation. Excellent agreement with the experiment is achieved when a dominant exchange interaction (|J|/kB73K), along the monoclinic b axis and a sizable easy-axis magnetic anisotropy (|D|/kB3K) are considered. Despite earlier suggestions for two-dimensional spin interactions, the dynamics illustrate strongly coupled antiferromagnetic S=2 chains and cancellation of the interchain exchange due to the lattice topology. α-NaMnO2 therefore represents a model system where the geometric frustration is resolved through the lowering of the dimensionality of the spin interactions. © 2009 The American Physical Society.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevLett.103.077202
Additional information: Unmapped bibliographic data: C7 - 077202 [EPrints field already has value set] LA - English [Field not mapped to EPrints] J2 - Phys Rev Lett [Field not mapped to EPrints] AD - ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, United Kingdom [Field not mapped to EPrints] AD - Institute for Electronic Structure and Laser, Foundation of Research and Technology-Hellas, Vassilika Vouton, 71110 Heraklion, Greece [Field not mapped to EPrints] AD - Department of Chemistry, University of Crete, Voutes, 71003 Heraklion, Greece [Field not mapped to EPrints] AD - NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, MD 20899-6102, United States [Field not mapped to EPrints] AD - Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742-2115, United States [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Anisotropic triangular lattice, Antiferromagnetic orders, Antiferromagnetics, Geometric frustration, Lattice topology, Magnetic dynamics, Magnetic fluctuation, Model system, Neutron inelastic scattering, One-dimensional, Single-mode approximation, Spectral weight, Spin gap, Spin interaction, Triangular lattice, Two-dimensional, Antiferromagnetic materials, Antiferromagnetism, Magnetic anisotropy, Spin fluctuations
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 15 Oct 2015 11:24 UTC
Last Modified: 29 May 2019 16:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51005 (The current URI for this page, for reference purposes)
  • Depositors only (login required):