期刊
SCIENTIFIC REPORTS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep07933
关键词
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资金
- National Key Basic Research [2011CBA00111]
- National Natural Science Foundation of China [51322105, 11174295, 51301167, 51171177, 91222109, U1232138]
- Chinese Academy of Sciences' Large-Scale Scientific Facility [U1232138]
- Foundation of Hefei Center for Physical Science and Technology [2012FXCX007]
For ferromagnets, varying from simple metals to strongly correlated oxides, the critical behaviors near the Curie temperature (T-C) can be grouped into several universal classes. In this paper, we report an unusual critical behavior in manganese nitrides Cu1-xNMn3+x (0.1 <= x <= 0.4). Although the critical behavior below T-C can be well described by mean field (MF) theory, robust critical fluctuations beyond the expectations of any universal classes are observed above T-C in x = 0.1. The critical fluctuations become weaker when x increases, and the MF-like critical behavior is finally restored at x = 0.4. In addition, the paramagnetic susceptibility of all the samples deviates from the Curie-Weiss (CW) law just above T-C. This deviation is gradually smeared as x increases. The short-range antiferromagnetic ordering above T-C revealed by our electron spin resonance measurement explains both the unusual critical behavior and the breakdown of the CW law.
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