Abstract
We report on a μSR study of U 1− x Th x Pt 3 ( 0 ⩽ x ⩽ 0.05 ) conducted to investigate the onset of “large-moment antiferromagnetism” (LMAF). At low Th content ( x ⩽ 0.002 ) magnetic ordering on the time scale of the μSR experiment (10 −8 s) is not detected. For x = 0.005 a weak magnetic signal appears below T = 2 K , while for 0.006 ⩽ x ⩽ 0.05 , spontaneous oscillations in the μSR spectra signal the presence of the LMAF phase. Analysis of the μSR spectra with a three-component depolarization function reveals that the magnetic phase transition is quite broad. The broadening may be the effect of disorder on the fluctuation spectrum of the small-moment antiferromagnetic state reported for UPt 3 below T N ∼ 6 K .
Published Version
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