Macroscopic Measurement of Resonant Magnetization Tunneling in High-Spin Molecules

Jonathan R. Friedman, M. P. Sarachik, J. Tejada, and R. Ziolo
Phys. Rev. Lett. 76, 3830 – Published 13 May 1996
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Abstract

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.

  • Received 1 November 1995

DOI:https://doi.org/10.1103/PhysRevLett.76.3830

©1996 American Physical Society

Authors & Affiliations

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

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Vol. 76, Iss. 20 — 13 May 1996

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