The V-15 molecule, a multi-spin two-level system: Adiabatic LZS transition with or without dissipation and Kramers theorem

Barbara B, Chiorescu I, Wernsdorfer W, Bögge H, Müller A (2002)
PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT (145): 357-369.

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The so-called V-15 compound, of formula K-6[(V15As6O42)-As-IV(H2O)]8H(2)O, is formed of 15 spins 1 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.
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Barbara B, Chiorescu I, Wernsdorfer W, Bögge H, Müller A. The V-15 molecule, a multi-spin two-level system: Adiabatic LZS transition with or without dissipation and Kramers theorem. PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT. 2002;(145):357-369.
Barbara, B., Chiorescu, I., Wernsdorfer, W., Bögge, H., & Müller, A. (2002). The V-15 molecule, a multi-spin two-level system: Adiabatic LZS transition with or without dissipation and Kramers theorem. PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT(145), 357-369.
Barbara, B., Chiorescu, I., Wernsdorfer, W., Bögge, H., and Müller, A. (2002). The V-15 molecule, a multi-spin two-level system: Adiabatic LZS transition with or without dissipation and Kramers theorem. PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, 357-369.
Barbara, B., et al., 2002. The V-15 molecule, a multi-spin two-level system: Adiabatic LZS transition with or without dissipation and Kramers theorem. PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, (145), p 357-369.
B. Barbara, et al., “The V-15 molecule, a multi-spin two-level system: Adiabatic LZS transition with or without dissipation and Kramers theorem”, PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, 2002, pp. 357-369.
Barbara, B., Chiorescu, I., Wernsdorfer, W., Bögge, H., Müller, A.: The V-15 molecule, a multi-spin two-level system: Adiabatic LZS transition with or without dissipation and Kramers theorem. PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT. 357-369 (2002).
Barbara, B, Chiorescu, I, Wernsdorfer, W, Bögge, Hartmut, and Müller, Achim. “The V-15 molecule, a multi-spin two-level system: Adiabatic LZS transition with or without dissipation and Kramers theorem”. PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT 145 (2002): 357-369.
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