title: Spin-spin cross relaxation in single-molecule magnets.
abstract: 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.
authors.affiliation: Laboratoire Louis Néel, Associé à l'UJF, CNRS, BP 166, 38042 Grenoble Cedex 9, France.
authors.forename: W
authors.initials: W
authors.lastname: Wernsdorfer
authors.forename: S
authors.initials: S
authors.lastname: Bhaduri
authors.forename: R
authors.initials: R
authors.lastname: Tiron
authors.forename: D N
authors.initials: DN
authors.lastname: Hendrickson
authors.forename: G
authors.initials: G
authors.lastname: Christou