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http://hdl.handle.net/11375/8568
Title: | Antiferromagnetism in CsMnF₃ |
Authors: | Khatamian, Djamshid |
Advisor: | Collins, M.F. |
Department: | Physics |
Keywords: | Physics;Physics |
Publication Date: | Sep-1976 |
Abstract: | <p>Two of the magnetic properties of antiferromagnet, CsMnF₃, were studied by thermal neutron scattering techniques.</p> <p>Spin wave-dispersion curves, along the two high symmetry directions (00ξ) and (ξ00), were determined and were satisfactorily fitted to a theoretical model with two nearest neighbour exchange constants, J₁₂ = 0.134±.003 THz and J₂₃ = 0.094±.0105 THz, and one second nearest neighbour exchange constant, J₃₅=-0.0138±.003 THz. The spin wave properties can be described in terms of an effective anisotropy field of -2700±900 Oe along the crystal c axis. This field constrains the spins to the basal plane of the crystal. The calculations show that magnetic dipole-dipole interactions, alone, provide enough anisotropy to account for the observed results.</p> <p>The sublattice magnetization, over the temperature range of 6.8 K to 72.2 K, was measured. This shows a critical phase transition with a critical exponent β given by β = 0.317±.009.</p> |
URI: | http://hdl.handle.net/11375/8568 |
Identifier: | opendissertations/3763 4780 1710809 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
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fulltext.pdf | 2.91 MB | Adobe PDF | View/Open |
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