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Spin dynamics in the neutral rare-earth single-molecule magnets TbPc 2 0 and DyPc 2 0 from μ SR and NMR spectroscopies

Spin dynamics in the neutral rare-earth single-molecule magnets TbPc 2 0 and DyPc 2 0 from μ SR... The spin dynamics in TbPc 2 0 and DyPc 2 0 single-molecule magnets have been investigated by means of muon and nuclear spin-lattice relaxation rate measurements. The correlation time for the spin fluctuations was found to be close to 0.1 ms already at 50 K, about 2 orders of magnitude larger than the one previously found in other lanthanide-based single-molecule magnets. In TbPc 2 0 two different regimes for the spin fluctuations have been evidenced: a high-temperature activated one involving spin fluctuations across a barrier<?xpp j?> Δ ≃ 880 K separating the ground and first excited states and a low-temperature regime involving quantum fluctuations within the twofold degenerate ground state. In DyPc 2 0 a high-temperature activated spin dynamics is also evidenced which, however, cannot be explained in terms of a single spin-phonon coupling constant. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Spin dynamics in the neutral rare-earth single-molecule magnets TbPc 2 0 and DyPc 2 0 from μ SR and NMR spectroscopies

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References (2)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2009 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.79.220404
Publisher site
See Article on Publisher Site

Abstract

The spin dynamics in TbPc 2 0 and DyPc 2 0 single-molecule magnets have been investigated by means of muon and nuclear spin-lattice relaxation rate measurements. The correlation time for the spin fluctuations was found to be close to 0.1 ms already at 50 K, about 2 orders of magnitude larger than the one previously found in other lanthanide-based single-molecule magnets. In TbPc 2 0 two different regimes for the spin fluctuations have been evidenced: a high-temperature activated one involving spin fluctuations across a barrier<?xpp j?> Δ ≃ 880 K separating the ground and first excited states and a low-temperature regime involving quantum fluctuations within the twofold degenerate ground state. In DyPc 2 0 a high-temperature activated spin dynamics is also evidenced which, however, cannot be explained in terms of a single spin-phonon coupling constant.

Journal

Physical Review B – American Physical Society (APS)

Published: Jun 1, 2009

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