Issue |
Europhys. Lett.
Volume 68, Number 6, December 2004
|
|
---|---|---|
Page(s) | 888 - 893 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2004-10274-6 | |
Published online | 17 November 2004 |
Scaling of the susceptibility vs. magnetic-field
sweep rate in
molecular magnet
1
Department de Física Fonamental, Universitat de Barcelona Diagonal 647, 08024 Barcelona, Spain
2
Pulsed Field Group, Laboratory of Solid-State Physics and Magnetism, K.U. Leuven Celestijnenlaan 200D, B-3001 Leuven, Belgium
Received:
18
August
2004
Accepted:
14
October
2004
The dependence of the magnetization reversal on the sweep rate of
the applied magnetic field has been studied for single crystals
of magnetic molecules. Our experiments have been
conducted at temperatures below 1
and sweep rates of the
magnetic field between 103
to 104
. The
systematic shift of the values of the magnetic field at which the
magnetization reversal occurs, indicates that this reversal
process is not governed by the Landau-Zener transition model. Our
data can be explained in terms of the superradiance emission model
proposed by Chudnovsky and Garanin (Phys. Rev.
Lett. 89 (2002) 157201).
PACS: 75.50.Xx – Molecular magnets / 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects / 42.50.Fx – Cooperative phenomena in quantum optical systems
© EDP Sciences, 2004
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