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
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.