Issue |
Europhys. Lett.
Volume 50, Number 3, May I 2000
|
|
---|---|---|
Page(s) | 395 - 401 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2000-00282-0 | |
Published online | 01 September 2002 |
Non-Kramers freezing and unfreezing of tunneling in the biaxial spin model
1
Department of Physics and Astronomy, City University of New
York-Lehman College
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: chudnov@lehman.cuny.edu xavim@ubxlab.com
Received:
2
December
1999
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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