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Spin wave dispersion and magnons from short range order in tapiolite (FeTa2O6); a quasi-two-dimensional antiferromagnet
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UNSPECIFIED (2005) Spin wave dispersion and magnons from short range order in tapiolite (FeTa2O6); a quasi-two-dimensional antiferromagnet. JOURNAL OF PHYSICS-CONDENSED MATTER, 17 (46). pp. 7227-7235. doi:10.1088/0953-8984/17/46/007 ISSN 0953-8984.
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Official URL: http://dx.doi.org/10.1088/0953-8984/17/46/007
Abstract
We describe neutron inelastic scattering measurements of spin waves in the quasi-two-dimensional antiferromagnet FeTa2O6. The intrinsic spin wave dispersion for a single domain is deduced from linear spin wave theory and used to determine the intra-plane exchange coefficients. Almost dispersion-free excitations are observed along the c* direction perpendicular to the magnetic planes. This justifies the neglect of inter-plane coupling, which merely stabilizes the ordered configuration below T-N. Spin wave theory yields values for the nearest neighbour and next nearest neighbour exchange constants on perpendicular diagonals of J = -0.040(9) meV, J'/J = 0.20(0), T'/J = 0.23(9), and the anisotropy parameter D = 0.31(8) meV. The large value of D shows an Ising-like spin configuration to be consistent with the experimental data. Measurements of the temperature dependence of the scattering show that magnetic excitations persist to at least 20 K (over two times T-N) due to the extensive 2D short range order. This is a highly unusual result, and has consequences for the understanding of two-dimensional spin systems.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | JOURNAL OF PHYSICS-CONDENSED MATTER | ||||
Publisher: | IOP PUBLISHING LTD | ||||
ISSN: | 0953-8984 | ||||
Official Date: | 23 November 2005 | ||||
Dates: |
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Volume: | 17 | ||||
Number: | 46 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 7227-7235 | ||||
DOI: | 10.1088/0953-8984/17/46/007 | ||||
Publication Status: | Published |
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