Exchange constants and spin dynamics in Mn12-acetate

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dc.creatorHonecker, A.
dc.creatorFukushima, N.
dc.creatorNormand, B.
dc.creatorChaboussant, G.
dc.creatorGuedel, H. -U.
dc.date2004-08-26
dc.date.accessioned2026-07-07T02:59:57Z
dc.date.available2026-07-07T02:59:57Z
dc.descriptionWe have obtained new inelastic neutron scattering (INS) data for the molecular magnet Mn12-acetate which exhibit at least six magnetic peaks in the energy range 5-35 meV. These are compared with a microscopic Heisenberg model for the 12 quantum spins localised on the Mn ions, coupled by four inequivalent magnetic exchange constants. A fit to the magnetic susceptibility under the constraint that the spin of the ground state be S=10 yields two dominant exchange constants of very similar value, J1 ~ J2 ~ 65 K (~ 5.5 meV), and two smaller exchange constants J3 and J4. We compute the low-lying excitations by exact numerical diagonalisation and demonstrate that the parameters determined from the ground state and susceptibility fit provide qualitative agreement with the excitations observed by INS.
dc.description3 pages including 3 figures, uses elsart style files (included); to appear in JMMM (proceedings of JEMS'04)
dc.identifierhttps://arxiv.org/abs/cond-mat/0408576
dc.identifierhttp://arxiv.org/abs/cond-mat/0408576
dc.identifierJ. Magn. Magn. Mater. 290-291 (2005) 966-969
dc.identifierdoi:10.1016/j.jmmm.2004.11.302
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24714
dc.subjectStrongly Correlated Electrons
dc.subjectMesoscale and Nanoscale Physics
dc.titleExchange constants and spin dynamics in Mn12-acetate
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