Submillimeter spectroscopy of -Ac magnetic clusters
General Physics Institute of RAS - 38, Vavilov st., 117942 Moscow, Russia
2 Dipartimento di Chimica, Università di Firenze, Via Maragliano 77, 50144 Firenze, Italy
Accepted: 23 October 1998
Transitions inside the ground S= 10 multiplet of magnetic clusters Mn12-Ac have been observed in submillimeter transmission spectra measured by means of a quasi-optical backward-wave-oscillator technique in the frequency range –. The temperature dependence of the resonance frequencies, linewidths and mode contributions to the magnetic permeability in the range T=3–35 K are consistent on the whole with a spin S=10 ground state split by a tetragonal crystal field. However, some deviations between the calculated and observed mode contributions at high temperatures suggest the presence of other Mn12-Ac excited multiplets with .
PACS: 76.30.-v – Electron paramagnetic resonance and relaxation / 75.10.Dg – Crystal-field theory and spin Hamiltonians / 75.30.Gw – Magnetic anisotropy
© EDP Sciences, 1998