Gaudefroyite: a mineral with excellent magnetocaloric effect suitable for liquefying hydrogen

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  • National Center for Nanoscience and Technology


Gaudefroyite contains chains of edge-linked MnO6 octahedra on a Kagomé lattice which results in magnetic frustration between the chains and overall spin-liquid behaviour below 9 K. Magnetization and specific heat measurements indicate very large entropy increases for temperatures of 10–30 K on removal of applied magnetic fields as low as 2 T. This is attributed to the degenerate magnetic ground states originating from the frustrated Kagomé lattice. Direct temperature change measurements confirm that the mineral has excellent low-field magnetocaloric properties suitable for refrigeration to produce liquid hydrogen.


Original languageEnglish
JournalJournal of Materials Chemistry A
Early online date13 Sep 2017
Publication statusE-pub ahead of print - 13 Sep 2017