Submillimeter spectroscopy of ${\rm Mn_{12}}$-Ac magnetic clusters

A.A. Mukhin; V.D. Travkin; A.K. Zvezdin; S.P. Lebedev; A. Caneschi; D. Gatteschi

doi:doi:10.1209/epl/i1998-00541-0

DOI: 10.1209/epl/i1998-00541-0

Europhys. Lett, 44 (6), pp. 778-782 (1998)

Submillimeter spectroscopy of ${\rm Mn_{12}}$ -Ac magnetic clusters

A. A. Mukhin ¹, V. D. Travkin ¹, A. K. Zvezdin ¹, S. P. Lebedev ¹
A. Caneschi ² and D. Gatteschi ²

¹ General Physics Institute of RAS - 38, Vavilov st., 117942 Moscow, Russia
² Dipartimento di Chimica, Università di Firenze
Via Maragliano 77, 50144 Firenze, Italy

(received 3 August 1998; accepted in final form 23 October 1998)

PACS. 76.30 ${\rm -v}$ - Electron paramagnetic resonance and relaxation.
PACS. 75.10Dg - Crystal-field theory and spin Hamiltonians.
PACS. 75.30Gw - Magnetic anisotropy.

Abstract:

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 $\nu=3$ - $\rm 33 \;cm^{-1}$ . 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 $S\ne 10$ .

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Submillimeter spectroscopy of -Ac magnetic clusters

Abstract:

Submillimeter spectroscopy of ${\rm Mn_{12}}$ -Ac magnetic clusters