Volume 55, Number 6, September II 2001
|Page(s)||874 - 879|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Abrupt crossover between thermally activated relaxation and quantum tunneling in a molecular magnet
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
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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