Observation of the influence of dipolar and spin frustration effects on the magnetocaloric properties of a trigonal prismatic {Gd7} molecular nanomagnet

Eufemio Moreno Pineda; Giulia Lorusso; Karzan H. Zangana; Elias Palacios; Jürgen Schnack; Marco Evangelisti; Richard E. P. Winpenny; Eric J. L. McInnes

doi:10.1039/C6SC01415A

Observation of the influence of dipolar and spin frustration effects on the magnetocaloric properties of a trigonal prismatic {Gd₇} molecular nanomagnet†

Eufemio Moreno Pineda,‡^a Giulia Lorusso,^b Karzan H. Zangana,^ac Elias Palacios,^b Jürgen Schnack,^d Marco Evangelisti,^b Richard E. P. Winpenny*^a and Eric J. L. McInnes

*^a

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* Corresponding authors

^a School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
E-mail: Eric.Mcinnes@manchester.ac.uk, richard.winpenny@manchester.ac.uk

^b Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC – Universidad de Zaragoza, Departamento de Física de la Materia Condensada, 50009 Zaragoza, Spain

^c Department of Chemistry, College of Education, Salahaddin University-Erbil, Kurdistan Region-Iraq

^d Faculty of Physics, University of Bielefeld, Universitätsstr. 25, D-33615 Bielefeld, Germany

Abstract

We report the synthesis and structure of a molecular {Gd₇} cage of the formula (ⁱPr₂NH₂)₆[Gd₇(μ₃-OH)₃(CO₃)₆(O₂C^tBu)₁₂] which has crystallographic C_3h symmetry. Low temperature specific heat and adiabatic demagnetization experiments (the latter achieving temperatures below 100 mK), lead to the observation of the effects of both intramolecular dipolar interactions and geometric spin frustration. The dipolar interaction leads to a massive rearrangement of energy levels such that specific heat and entropy below 2 K are strongly modified while magnetic susceptibility and magnetization above 2 K are not affected. The consequences of these phenomena for low temperature magnetocaloric applications are discussed.

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DOI: https://doi.org/10.1039/C6SC01415A
Article type: Edge Article
Submitted: 30 Mar 2016
Accepted: 22 Apr 2016
First published: 25 Apr 2016
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry

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Chem. Sci., 2016,7, 4891-4895

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Observation of the influence of dipolar and spin frustration effects on the magnetocaloric properties of a trigonal prismatic {Gd₇} molecular nanomagnet

E. M. Pineda, G. Lorusso, K. H. Zangana, E. Palacios, J. Schnack, M. Evangelisti, R. E. P. Winpenny and E. J. L. McInnes, Chem. Sci., 2016, 7, 4891 DOI: 10.1039/C6SC01415A

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