The V_<15> Molecule, a Multi-Spin Two-Level System : Adiabatic LZS Transition with or without Dissipation and Kramers Theorem

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概要

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• The so-called V_15 compound, of formula K_6[V^<IV>_<15>As_6O_<42>(H_2O)]8H_2O, is formed of 15 spins 1/2 antiferromagnetically coupled. The resultant spin is equal to 1/2. Contrary to what is expected at first sight, this half-integer spin is gapped. We show that this is a consequence of the multi-spin character of the molecule. Time reversal symmetry (Kramers theorem) is preserved due to the existence of a groundstate degeneracy larger than 2. Magnetization experiments have been performed at different temperatures, sweeping-field rates and couplings with the cryostat. Their interpretation in terms of the Landau-Zener-Stuckelberg model gives evidence for adiabatic LZS spin reversal with and without dissipation.

• 理論物理学刊行会の論文
• 2002-06-28

著者

• Barbara Bernard

  Laboratoire De Magnetisme Louis Neel Cnrs

• Muller Achim

  Fakultat Fur Chemie Universitat Bielefeld

• Wernsdorfer Wolfgang

  Laboratoire De Magnetisme Louis Neel Cnrs

• Chiorescu Irinel

  Laboratoire De Magnetisme Louis Neel Cnrs

• BOGGE Hartmut

  Fakultat fur Chemie, Universitat Bielefeld

• Bogge Hartmut

  Fakultat Fur Chemie Universitat Bielefeld

• WERNSDORFER Wolfgang

  Laboratoire de Magnetisme Louis Neel, CNRS

• BARBARA Bernard

  Laboratoire de Magnetisme Louis Neel, CNRS

• Chiorescu Irinel

  Laboratoire de Magnetisme Louis Neel, CNRS

関連論文

• Detailed ESR Measurements for the Quantum Molecular Magnet V15 at Ultra-Low Temperatures(Nanometer-Scale Magnets, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
• Macroscopic Quantum Tunneling in Ferromagnetic Particles
• The V_ Molecule, a Multi-Spin Two-Level System : Adiabatic LZS Transition with or without Dissipation and Kramers Theorem

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