Numéro |
J. Phys. I France
Volume 5, Numéro 10, October 1995
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|
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Page(s) | 1281 - 1300 | |
DOI | https://doi.org/10.1051/jp1:1995197 |
J. Phys. I France 5 (1995) 1281-1300
A simple Derivation of the Tunneling Splitting for Large Quantum Spins
Françoise Hartmann-BoutronLaboratoire de Spectrométrie Physique (UJF-CNRS, UA 08), Université J. Fourier/Grenoble I, B.P. 87, 38402 Saint-Martin d'Hères Cédex, France
(Received 8 June 1995, received and accepted in final form 6 July 1995, )
Abstract
With the help of a pertubation treatment to lowest order, general expressions for the tunneling
splitting have been derived for a quantum spin
S. This spin is assumed to have a main axial
Hamiltonian (without applied longitudinal magnetic field), and to be submitted to perturbations
with orthorhombic, tetragonal, trigonal or hexagonal symmetries, or to a transverse field. The
formulas obtained are valid for general (not very small)
S. They are compared with available
results of the literature. Previous observations of tunneling splittings in terbium compounds by
EPR are mentioned, with the relevant references.
© Les Editions de Physique 1995