Fragmenting gadolinium: mononuclear polyoxometalate-based magnetic coolers for ultra-low temperatures.
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.
Instituto de Ciencia de Materiales de Aragón (ICMA) and Departamento de Física de la Materia Condensada, CSIC - Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain.
María-José
MJ
Martínez-Pérez
Oscar
O
Montero
Marco
M
Evangelisti
Fernando
F
Luis
Javier
J
Sesé
Salvador
S
Cardona-Serra
Eugenio
E
Coronado
D003080:Cold Temperature; D019277:Entropy; D005682:Gadolinium / Q000737:chemistry*; D008280:Magnetics; D017973:Tungsten Compounds / Q000737:chemistry*; D000099294:Polyoxometalates
D005682:Gadolinium; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates