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Magnetochemistry 2016, 2(4), 45; doi:10.3390/magnetochemistry2040045

Perspectives on Neutron Scattering in Lanthanide-Based Single-Molecule Magnets and a Case Study of the Tb2(μ-N2) System

1
Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany
2
Department of Chemistry, University of Washington, Seattle, WA 98195, USA
3
Department of Chemistry, University of California, Irvine, CA 92617, USA
4
Department of Chemistry, University of California, Berkeley, CA 94720, USA
5
Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
6
Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA
7
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
8
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Kevin Bernot
Received: 8 November 2016 / Revised: 24 November 2016 / Accepted: 25 November 2016 / Published: 14 December 2016
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)
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Abstract

Single-molecule magnets (SMMs) based on lanthanide ions display the largest known blocking temperatures and are the best candidates for molecular magnetic devices. Understanding their physical properties is a paramount task for the further development of the field. In particular, for the poly-nuclear variety of lanthanide SMMs, a proper understanding of the magnetic exchange interaction is crucial. We discuss the strengths and weaknesses of the neutron scattering technique in the study of these materials and particularly for the determination of exchange. We illustrate these points by presenting the results of a comprehensive inelastic neutron scattering study aimed at a radical-bridged diterbium(III) cluster, Tb2(μ-N23−), which exhibits the largest blocking temperature for a poly-nuclear SMM. Results on the YIII analogue Y2(μ-N23−) and the parent compound Tb2(μ-N22−) (showing no SMM features) are also reported. The results on the parent compound include the first direct determination of the lanthanide-lanthanide exchange interaction in a molecular cluster based on inelastic neutron scattering. In the SMM compound, the resulting physical picture remains incomplete due to the difficulties inherent to the problem. View Full-Text
Keywords: single-molecule magnet; lanthanide ions; inelastic neutron scattering; ligand field; Ising model; magnetic exchange single-molecule magnet; lanthanide ions; inelastic neutron scattering; ligand field; Ising model; magnetic exchange
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MDPI and ACS Style

Prša, K.; Nehrkorn, J.; Corbey, J.F.; Evans, W.J.; Demir, S.; Long, J.R.; Guidi, T.; Waldmann, O. Perspectives on Neutron Scattering in Lanthanide-Based Single-Molecule Magnets and a Case Study of the Tb2(μ-N2) System. Magnetochemistry 2016, 2, 45.

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