Title

Anomalous field sweep rate dependence of the tunnel relaxation in single-molecule magnet Mn-4-Bet

Authors

Authors

E. del Barco; K. J. Heroux;D. N. Hendrickson

Comments

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Abbreviated Journal Title

Polyhedron

Keywords

Single-molecule magnets; Quantum tunneling; MN-12-ACETATE; Chemistry, Inorganic & Nuclear; Crystallography

Abstract

We present a low-temperature magnetometry study of the behavior of the quantum tunneling of the magnetization (QTM) in a Mn-4 single-molecule magnet (SMM) as a function of the rate at which a longitudinal magnetic field is swept across a QTM resonance. An initial decrease of the tunnel relaxation rate with increasing field sweeping rate is eventually replaced by an anomalous monotonic increase for moderately high sweep rates. This behavior is distinct from the drastic reversal of the total sample magnetization caused by thermal avalanches ("hot" process), which is commonly observed in other SMMs when increasing the sweep rate, usually due to poor thermal conduction or inadequate thermal anchoring of the sample. We associate the observations to a ("cold") mechanism by which different collections of molecules within the crystal relax collectively without affecting the rest of the molecules. (C) 2013 Elsevier Ltd. All rights reserved.

Journal Title

Polyhedron

Volume

66

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

179

Last Page

182

WOS Identifier

WOS:000327685100029

ISSN

0277-5387

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