Fragmenting Gadolinium: Mononuclear Polyoxometalate‐Based Magnetic Coolers for Ultra‐Low Temperatures

descriptionPublicationkeyboard_double_arrow_right Article 21 Jun 2012 Spain English Publisher:WileyJournal:Advanced Materials, volume 24, pages 4,301-4,305 (issn: 0935-9648, eissn: 1521-4095,

Copyright policy )Funded by:EC | SPINMOL

Authors: Martínez-Pérez, Maria José; Montero, Oscar; Evangelisti, Marco; Luis, Fernando; Sesé, Javier; Cardona Serra, Salvador; Coronado, E.;

doi: 10.1002/adma.201200750

pmid: 22718245

handle: 10261/73557

Fragmenting Gadolinium: Mononuclear Polyoxometalate‐Based Magnetic Coolers for Ultra‐Low Temperatures

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Abstract

The polyoxometalate clusters with formula [Gd(W(5) O(18) )(2) ](9-) and [Gd(P(5) W(30) O(110) )](12-) each carry a single magnetic ion of gadolinium, which is the most widespread element among magnetic refrigerant materials. In an adiabatic demagnetization, the lowest attainable temperature is limited by the presence of magnetic interactions that bring about magnetic order below a critical temperature. We demonstrate that this limitation can be overcome by chemically engineering the molecules in such a way to effectively screen all magnetic interactions, suggesting their use as ultra-low-temperature coolers.

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Spain

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Keywords

Cold Temperature, Magnetics, Entropy, Polyoxometalates, Gadolinium, Tungsten Compounds

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