Decoherence Window and Electron-Nuclear Cross Relaxation in the Molecular Magnet V15

J. H. Shim, S. Bertaina, S. Gambarelli, T. Mitra, A. Müller, E. I. Baibekov, B. Z. Malkin, B. Tsukerblat, and B. Barbara
Phys. Rev. Lett. 109, 050401 – Published 31 July 2012
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Abstract

Rabi oscillations in the V15 single molecule magnet embedded in the surfactant (CH3)2[CH3(CH2)16CH2]2N+ have been studied at different microwave powers. An intense damping peak is observed when the Rabi frequency ΩR falls in the vicinity of the Larmor frequency of protons ωN. The experiments are interpreted by a model showing that the damping (or Rabi) time τR is directly associated with decoherence caused by electron-nuclear cross relaxation in the rotating reference frame. This decoherence induces energy dissipation in the range ωNσe<ΩR<ωN, where σe is the mean superhyperfine field induced by protons at V15. Weaker decoherence without dissipation takes place outside this window. Specific estimations suggest that this rapid cross relaxation in a resonant microwave field, observed for the first time in V15, should also take place, e.g., in Fe8 and Mn12.

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  • Received 18 August 2011

DOI:https://doi.org/10.1103/PhysRevLett.109.050401

© 2012 American Physical Society

Authors & Affiliations

J. H. Shim1,*, S. Bertaina2, S. Gambarelli1, T. Mitra3,†, A. Müller3, E. I. Baibekov4, B. Z. Malkin4, B. Tsukerblat5, and B. Barbara1,6

  • 1Laboratoire de Chimie Inorganique et Biologique (UMR-E3 CEA-UJF), INAC, CEA, Grenoble, 38054 Grenoble Cedex 9, France
  • 2IM2NP, CNRS (UMR 7334), and Université Aix-Marseille, 13397 Marseille Cedex 20, France
  • 3Fakultät für Chemie, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany
  • 4Kazan Federal University, Kazan, 420008, Russian Federation
  • 5Ben-Gurion University of the Negev, 84105 P.O. Box 653, Beer-Sheva, Israel
  • 6Institut Néel, CNRS, and Université Joseph Fourier, BP166, 38042 Grenoble Cedex 9, France

  • *Present address: Fakultät Physik, Technische Universität Dortmund, Dortmund 44221, Germany.
  • Present address: Donnan and Robert Robinson Laboratories, University of Liverpool, Crown Street, L69 7ZD, UK.

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Issue

Vol. 109, Iss. 5 — 3 August 2012

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