Unusual ferromagnetic critical behavior owing to short-range antiferromagnetic correlations in antiperovskite Cu(1-x)NMn(3+x) (0.1 ≤ x ≤ 0.4).

Unusual ferromagnetic critical behavior owing to short-range antiferromagnetic correlations in antiperovskite Cu(1-x)NMn(3+x) (0.1 ≤ x ≤ 0.4).
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DOI:
10.1038/srep07933
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发表时间:
2015-01-21
期刊:
影响因子:
4.6
通讯作者:
Sun Y
Sun Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lin J;Tong P;Cui D;Yang C;Yang J;Lin S;Wang B;Tong W;Zhang L;Zou Y;Sun Y

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对于铁磁体,从简单的金属到强相关的氧化物,居里温度(TC)附近的临界行为可以归类为几个普遍的类别。在本文中,我们报道了氮化锰化物Cu1-xNMn3+x(0.1NMn3+x(0.1NMn3+x≤x≤0.4))中一种不寻常的临界行为。虽然TC以下的临界行为可以用平均场(MF)理论很好地描述,但在TC以上(x=0.1),观测到了超出任何宇宙类预期的强健的临界涨落。随着x的增大,临界涨落变弱,在x=0.4时,类MF临界行为最终恢复。此外,所有样品的顺磁磁化率均偏离居里-魏斯(CW)定律。随着x的增加,这种偏差逐渐变得模糊。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。
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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