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Keywords:

  • gadolinium formate;
  • magnetocaloric effect;
  • magnetic refrigeration;
  • metal–organic frameworks;
  • molecule-based magnets
Thumbnail image of graphical abstract

The three-dimensional metal–organic framework Gd(HCOO)3 is characterized by a relatively compact crystal lattice of weakly interacting Gd3+ spin centers interconnected via lightweight formate ligands, overall providing a remarkably large magnetic:non-magnetic elemental weight ratio. The resulting magnetocaloric effect per unit volume is decidedly superior in Gd(HCOO)3 than in the best known magnetic refrigerant materials for liquid-helium temperatures and low-moderate applied fields.