Quantum Phase Interference and Néel-Vector Tunneling in Antiferromagnetic Molecular Wheels

O. Waldmann, T. C. Stamatatos, G. Christou, H. U. Güdel, I. Sheikin, and H. Mutka
Phys. Rev. Lett. 102, 157202 – Published 13 April 2009
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    Abstract

    The antiferromagnetic molecular wheel Fe18 of 18 exchange-coupled FeIII ions has been studied by magnetic torque, magnetization, and inelastic neutron scattering. The combined data show that the low-temperature magnetism of Fe18 is very accurately described by the Néel-vector tunneling (NVT) scenario, as unfolded by semiclassical theory. In addition, the magnetic torque as a function of applied field exhibits oscillations that reflect the oscillations in the NVT splitting with field due to quantum phase interference.

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    • Received 15 December 2008

    DOI:https://doi.org/10.1103/PhysRevLett.102.157202

    ©2009 American Physical Society

    Authors & Affiliations

    O. Waldmann1,*, T. C. Stamatatos2, G. Christou2, H. U. Güdel3, I. Sheikin4, and H. Mutka5

    • 1Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany
    • 2Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA
    • 3Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland
    • 4Grenoble High Magnetic Field Laboratory, CNRS, BP 166, 38042 Grenoble Cedex 9, France
    • 5Institut Laue-Langevin, 6 Rue Jules Horowitz, BP 156, F-38042 Grenoble Cedex 9, France

    • *oliver.waldmann@physik.uni-freiburg.de

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    Vol. 102, Iss. 15 — 17 April 2009

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