反钙钛矿Cu1-xNMn3 +x（0.1<x<0.4）中短程反铁磁关联引起的反常铁磁临界行为
Unusual ferromagnetic critical behavior owing to short-range antiferromagnetic correlations in antiperovskite Cu1-xNMn3+x(0.1<x<0.4)
摘要：
对于铁磁体，从简单的金属到强关联的氧化物，居里温度（TC）附近的临界行为可以分为几个普遍的类别。本文报道了锰氮化物Cu_（1-x）NMn_（3 +x）（0.1<x<0.4）的一种不寻常的临界行为。虽然TC以下的临界行为可以很好地描述平均场（MF）理论，强大的临界波动超出任何普遍的类的预期，观察到TC以上的x=0.1。临界涨落随着x的增加而减弱，最终在x=0.4时恢复到类似MF的临界行为。此外，所有样品的顺磁磁化率偏离居里-外斯（CW）定律略高于TC。这个偏差随着x的增加而逐渐模糊。我们的电子自旋共振测量揭示了TC以上的短程反铁磁有序解释了不寻常的临界行为和CW定律的崩溃。
英文摘要：
For ferromagnets, varying from simple metals to strongly correlated oxides,the critical behaviors near the Curie temperature (TC) 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 TC can be well described by mean field (MF) theory, robust critical fluctuations beyond the expectations of any universal classes are observed above TC 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 TC. This deviation is gradually smeared as x increases. The short-range antiferromagnetic ordering above TC revealed by our electron spin resonance measurement explains both the unusual critical behavior and the breakdown of the CW law.
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