Abrupt crossover between thermally activated relaxation and quantum tunneling in a molecular magnet

Authors
Mertes, KM Zhong, Y Sarachik, MP Paltiel, Y Shtrikman, H Zeldov, E Rumberger, E Hendrickson, DN Christou, G
Citation
Km. Mertes et al., Abrupt crossover between thermally activated relaxation and quantum tunneling in a molecular magnet, EUROPH LETT, 55(6), 2001, pp. 874-879
Citations number
18
Categorie Soggetti
Physics
Journal title
EUROPHYSICS LETTERS
ISSN journal
02955075 → ACNP
Volume
55
Issue
6
Year of publication
2001
Pages
874 - 879
Database
ISI
SICI code
0295-5075(200109)55:6<874:ACBTAR>2.0.ZU;2-1
Abstract
We report Hall sensor measurements of the magnetic relaxation of Mn 12 acet ate as a function of magnetic field applied along the easy axis of magnetiz ation. Detailed data taken at a series of closely spaced temperatures betwe en 0.24 K and 1.4 K indicate an abrupt shift between thermally activated an d ground-state tunneling over a narrow range of temperature.