Moment localization

It should be noticed that the spontaneous magnetization Mo vanishes for temperatures T and therefore no magnetic moment, localized or other-... 

The ZF-p,SR spectra are dominated by nuclear depolarization from Mn, which can easily be suppressed by LF = 10mT. A weak damping from fast fluctuating electronic moments remains. The situation is rather similar to that in UAI2. The nuclear depolarization varies in accordance with the structural transitions, only a final rise below 40 K remains unexplained. In simunary, the p,SR data provide no evidence for moment localization at U or for the onset of magnetic LRO. The transitions in UMn2 are thus purely structural. 

In conclusion, the partial replacement of Ce by U leads to moment localization (in contrast to the replacement by La). The resulting magnetic behavior is strongly inhomogeneous. Only parts of the sample enter into a quasistatic (presumably spin frozen) magnetic state while the rest remains paramagnetic, though with enhanced spin correlations. 

Fig. 27. Magnetization density at the z = level in URhAI, showing the presence of magnetic moments localized at both the U and Rh, sites in the structure. (From Paixao et al. (1992).)...

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