Issue |
Europhys. Lett.
Volume 55, Number 6, September II 2001
|
|
---|---|---|
Page(s) | 874 - 879 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2001-00363-0 | |
Published online | 01 December 2003 |
Abrupt crossover between thermally activated relaxation and quantum tunneling in a molecular magnet
1
Physics Department, City College of the City University of New York
New York, NY 10031, USA
2
Department of Condensed Mater Physics, The Weizmann Institute of Science
Rehovot 76100, Israel
3
Department of Chemistry and Biochemistry, University of California at San Diego
La Jolla, CA 92093, USA
4
Department of Chemistry, Indiana University - Bloomington, Indiana 47405, USA
Received:
22
May
2001
Accepted:
27
June
2001
We report Hall sensor measurements of the magnetic relaxation of Mn12 acetate as a function of magnetic field applied along the easy axis of magnetization. Detailed data taken at a series of closely spaced temperatures between 0.24 K and 1.4 K indicate an abrupt shift between thermally activated and ground-state tunneling over a narrow range of temperature.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.50.Xx – Molecular magnets
© EDP Sciences, 2001
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