Fragmenting Gadolinium: Mononuclear Polyoxometalate‐Based Magnetic Coolers for Ultra‐Low Temperatures
Advanced Materials2012Vol. 24(31), pp. 4301–4305
Citations Over TimeTop 10% of 2012 papers
María‐José Martínez‐Pérez, Oscar Montero, Marco Evangelisti, Fernando Luis, J. Sesé, Salvador Cardona‐Serra, Eugenio Coronado
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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