Spin ordering in the mixed-ligand antiferromagnet Mn(dca)2(pyrazine)
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Spin ordering in the mixed-ligand antiferromagnet Mn(dca)2(pyrazine). / Manson, J. L.; Chapon, L. C.; Bordallo, H. N.; Feyerherm, R.; Argyriou, D. N.; Loose, A.
In: Journal of Magnetism and Magnetic Materials, Vol. 260, No. 3, 01.04.2003, p. 462-466.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Spin ordering in the mixed-ligand antiferromagnet Mn(dca)2(pyrazine)
AU - Manson, J. L.
AU - Chapon, L. C.
AU - Bordallo, H. N.
AU - Feyerherm, R.
AU - Argyriou, D. N.
AU - Loose, A.
PY - 2003/4/1
Y1 - 2003/4/1
N2 - 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.
AB - 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.
KW - Antiferromagnetism
KW - Coordination polymers
KW - Inelastic neutron scattering
KW - Molecular magnetism
KW - Neutron diffraction
UR - http://www.scopus.com/inward/record.url?scp=0038687226&partnerID=8YFLogxK
U2 - 10.1016/S0304-8853(02)01390-2
DO - 10.1016/S0304-8853(02)01390-2
M3 - Journal article
AN - SCOPUS:0038687226
VL - 260
SP - 462
EP - 466
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 3
ER -
ID: 210118343