Molecular Magnetism Group: Nature Communications Articles
The molecular magnetism group published two articles in Nature Communications in October, testament to a very talented group of PhD students including Eufemio Moreno Pineda (who also passed his PhD viva in October), Nick Chilton (this is his second paper in Nature Commun. during his PhD) and Joseph Sharples (who graduated in 2013).
The first article tackles the problem of the influence of exchange interactions between lanthanide ions on their magnetic relaxation, a controversial topic in the literature. In this work such interactions, which are generally so weak they cannot be measured by conventional magnetometry methods, are measured directly by EPR spectroscopy, and together with ab initio methods are used to explain the dynamic magnetic behavior of a dysprosium dimer.
E. Moreno Pineda, N.F. Chilton, R. Marx, M. Dörfel, D.O. Sells, P. Neugebauer, S-D. Jiang, D. Collison, J. van Slageren, E.J.L. McInnes and R.E.P. Winpenny, “Direct measurement of dysprosium(III)…dysprosium(III) interactions in a single-molecule magnet”, Nature Commun. 2014, 5, 5243.
The second article reports the first experimental use of a molecular cluster as a refrigerant to achieve sub- Kelvin temperatures, exploiting the magnetocaloric effect via adiabatic demagnetization. The study is on a gadolinium cluster where the metal ions lie on the vertices of a triangular lattice. The manner in which the sample cools on demagnetisation is more complex than that of a simple paramagnet, showing regions of heating and cooling, and is a direct signature of geometric spin frustration – a hot topic in solid state physics – arising from the topology.
J.W. Sharples, D. Collison, E.J.L. McInnes, J. Schnack, E. Palacios and M. Evangelisti, “Quantum signatures of a molecular nanomagnet in direct magnetocaloric measurements”, Nature Commun. 2014, 5, 5321.