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Phys. Rev. B 67, 020402(R) (2003) [4 pages]

Adiabatic Landau-Zener-Stückelberg transition with or without dissipation in the low-spin molecular system V15

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I. Chiorescu1,*, W. Wernsdorfer1, A. Müller2, S. Miyashita3, and B. Barbara1
1Laboratoire Louis Néel, CNRS, Boîte Postale 166, 38042 Grenoble, France
2Fakültat für Chemie, Universität Bielefeld, D-33501 Bielefeld, Germany
3Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

Received 11 November 2002; published 15 January 2003

The spin-1/2 molecular system V15 shows no barrier against spin reversal. This makes possible direct phonon activation between the two levels. By tuning the field sweeping rate and the thermal coupling between the sample and the thermal reservoir we have control over the phonon-bottleneck phenomena previously reported in this system. We demonstrate adiabatic motion of molecule spins in time dependent magnetic fields and with different thermal coupling to the cryostat bath. We also discuss the origin of the zero-field tunneling splitting for a half-integer spin.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.020402
DOI:
10.1103/PhysRevB.67.020402
PACS:
75.50.Xx, 71.70.-d, 75.45.+j

*Present address: Department of Applied Physics, Delft University of Technology, 2628 CJ, Delft, The Netherlands

 
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