Abstract

U 2Co 2Sn (Mo 2FeB 2 structure type, space group P4/ mbm), exhibing non-Fermi liquid features and ferromagnetic spin fluctuations, is the first representative of the U 2T 2X series found to absorb hydrogen. Two hydrides are formed with different hydrogen content. The crystal structure type is not changed upon hydrogenation and the unit cell volume expands by 1.4% for α -U 2Co 2SnH x and 8.1% for β -U 2Co 2SnH y . Hydrogenation leads to magnetic ordering in both hydrides. α -Hydride shows weak ferromagnetism below T C = 33.5 K , whereas the β -hydride is an antiferromagnet ( T N = 27 K ) similar to the other magnetically ordered hydrogen-free U 2T 2X compounds.

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