Volume 50, Number 3, May I 2000
|Page(s)||395 - 401|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Non-Kramers freezing and unfreezing of tunneling in the biaxial spin model
Department of Physics and Astronomy, City University of New
Bedford Park Boulevard West, Bronx, New York 10468-1589, USA
2 Departament de Física Fonamental, Universitat de Barcelona Diagonal 647, 08028 Barcelona, Spain
Corresponding authors: firstname.lastname@example.org email@example.com
Accepted: 15 February 2000
The ground state tunnel splitting for the biaxial spin model in the magnetic field, , has been investigated using an instanton approach. We find a new type of spin instanton and a new quantum interference phenomenon associated with it: at a certain field, , the dependence of the tunneling splitting on the field switches from oscillations to a monotonic growth. The predictions of the theory can be tested in Fe8 molecular nanomagnets.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Xx – Molecular magnets
© EDP Sciences, 2000
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