Macroscopic Quantum Coherence in Molecular Magnets

Alain Chiolero and Daniel Loss
Phys. Rev. Lett. 80, 169 – Published 5 January 1998
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Abstract

We study macroscopic quantum coherence in antiferromagnetic molecular magnets in the presence of magnetic fields. Such fields generate artificial tunnel barriers with externally tunable strength. We give detailed semiclassical predictions for tunnel splitting in various regimes for low and high magnetic fields. We show that the tunneling dynamics of the Néel vector can be directly measured via the static magnetization and the specific heat. We also report on a new quantum phase arising from fluctuations. The analytic results are complemented by numerical simulations.

  • Received 28 July 1997

DOI:https://doi.org/10.1103/PhysRevLett.80.169

©1998 American Physical Society

Authors & Affiliations

Alain Chiolero and Daniel Loss

  • Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

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Vol. 80, Iss. 1 — 5 January 1998

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