Onset of magnetic order in U2(Ni1-x Fex)2Sn-H

We present specific heat and magnetic studies as a function of temperature and magnetic field for U-2(Ni1-x Fe (x) )(2)Sn alloys (x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.4, 0.6 and 0.8) and their hydrides (absorption of a parts per thousand 2 H/f.u.). For the parent alloys, antiferromagnetic order is rapidly suppressed with increasing Fe concentration and non-Fermi-liquid behavior was found for x = 0.2. Hydrogenation of the parent alloys causes a substantial increase of T (N) in Fe-low hydrides (x < 0.2), while Fe-rich hydrides show an unexpected appearance of ferromagnetism in the range 0.4 a parts per thousand currency sign x a parts per thousand currency sign 0.8. Some of the findings are compared with similar studies in U2Co2Sn and U2Co2InH1.9.