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.
Original language | English |
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Journal | Journal of Magnetism and Magnetic Materials |
Volume | 260 |
Issue number | 3 |
Pages (from-to) | 462-466 |
Number of pages | 5 |
ISSN | 0304-8853 |
DOIs | |
Publication status | Published - 1 Apr 2003 |
Externally published | Yes |
- Antiferromagnetism, Coordination polymers, Inelastic neutron scattering, Molecular magnetism, Neutron diffraction
Research areas
ID: 210118343