Spin ordering in the mixed-ligand antiferromagnet Mn(dca)2(pyrazine)
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The flexibility offered by molecular-based systems allows us to introduce or replace specific ligands in a material with the aim of radically altering desired structural and magnetic properties. Specifically, Mn(dca)2(pyz) {dca = dicyanamide, [N(CN)2]-; pyz = pyrazine} has a unique interpenetrating ReO3-like lattice. The Mn2+ cations are high-spin (S = 5/2) and the material orders antiferromagnetically below TN = 2.53(2) K. Using neutron powder diffraction we observed a collinear spin structure oriented along the short ac-diagonal of the monoclinic unit cell. Inelastic neutron scattering results show a magnetic excitation at 0.23 meV. The strong dispersion character of this excitation demonstrates that it is related to a low-energy spin wave. Upon warming, the magnon gradually softens and disappears at TN, while critical scattering becomes evident by a broad quasielastic response above TN. The energy of the magnon is consistent with the exchange parameter, J, derived from magnetic susceptibility measurements.
Originalsprog | Engelsk |
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Tidsskrift | Journal of Magnetism and Magnetic Materials |
Vol/bind | 260 |
Udgave nummer | 3 |
Sider (fra-til) | 462-466 |
Antal sider | 5 |
ISSN | 0304-8853 |
DOI | |
Status | Udgivet - 1 apr. 2003 |
Eksternt udgivet | Ja |
ID: 210118343