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For ferromagnets, varying from simple metals to strongly correlatedoxides,the critical behaviors near the Curie temperature (TC) can be groupedinto several universal classes. In this paper, we report an unusual criticalbehavior in manganese nitrides Cu1-xNMn3+x(0.1<x<0.4). Although the criticalbehavior below TC can be well described by mean field (MF) theory, robustcritical fluctuations beyond the expectations of any universal classes areobserved above TC in x=0.1. The critical fluctuations become weaker when xincreases, and the MF-like critical behavior is finally restored at x=0.4. Inaddition, the paramagnetic susceptibility of all the samples deviates from theCurie-Weiss (CW) law just above TC. This deviation is gradually smeared as xincreases. The short-range antiferromagnetic ordering above TC revealed by ourelectron spin resonance measurement explains both the unusual critical behaviorand the breakdown of the CW law.

Unusual ferromagnetic critical behavior owing to short-range antiferromagnetic correlations in antiperovskite Cu1-xNMn3+x(0.1