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APS » Journals » Phys. Rev. Lett. » Volume 76 » Issue 20
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Phys. Rev. Lett. 76, 3830–3833 (1996)

Macroscopic Measurement of Resonant Magnetization Tunneling in High-Spin Molecules

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Jonathan R. Friedman and M. P. Sarachik
Department of Physics, The City College of the City University of New York, New York, New York 10031

J. Tejada
Facultat de Física, Universitat de Barcelona, 08028 Barcelona, Spain

R. Ziolo
Wilson Center for Research and Technology, Xerox Corporation, Webster, New York 14580

Received 1 November 1995; published in the issue dated 13 May 1996

We report the observation of steps at regular intervals of magnetic field in the hysteresis loop of a macroscopic sample of oriented Mn12O12(CH3COO)16(H2O)4 crystals. The magnetic relaxation rate increases substantially when the field is tuned to a step. We propose that these effects are manifestations of thermally assisted, field-tuned resonant tunneling between quantum spin states, and attribute the observation of quantum-mechanical phenomena on a macroscopic scale to tunneling in a large (Avogadro's) number of magnetically identical molecules.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.3830
DOI:
10.1103/PhysRevLett.76.3830
PACS:
75.60.Ej, 75.20.-g, 75.30.Gw, 75.50.Tt
 
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