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

Authors

  • María-José Martínez-Pérez,

    1. 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
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  • Oscar Montero,

    1. 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
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  • Marco Evangelisti,

    Corresponding author
    1. 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
    • 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
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  • Fernando Luis,

    1. 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
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  • Javier Sesé,

    1. Instituto de Nanociencia de Aragón and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, C/Mariano Esquillor s/n, 50018 Zaragoza, Spain
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  • Salvador Cardona-Serra,

    1. Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain
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  • Eugenio Coronado

    Corresponding author
    1. Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain
    • Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
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Abstract

original image

The polyoxometalate clusters with formula [Gd(W5O18)2]9− and [Gd(P5W30O110)]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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