Spin-spin cross relaxation in single-molecule magnets.
The one-body tunnel picture of single-molecule magnets (SMMs) is not always sufficient to explain the measured tunnel transitions. An improvement to the picture is proposed by including also two-body tunnel transitions such as spin-spin cross relaxation (SSCR) which are mediated by dipolar and weak superexchange interactions between molecules. A Mn4 SMM is used as a model system. At certain external fields, SSCRs lead to additional quantum resonances which show up in hysteresis loop measurements as well-defined steps. A simple model is used to explain quantitatively all observed transitions.
Wernsdorfer
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Laboratoire Louis Néel, Associé à l'UJF, CNRS, BP 166, 38042 Grenoble Cedex 9, France.
Bhaduri
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Tiron
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Hendrickson
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Christou
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