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首页> 外文期刊>Journal of Physics. Condensed Matter >Weak itinerant antiferromagnetism in PuIn_3 explored using ~(115)In nuclear quadrupole resonance
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Weak itinerant antiferromagnetism in PuIn_3 explored using ~(115)In nuclear quadrupole resonance

机译：使用〜（115）In核四极共振探索PuIn_3中的弱巡回反铁磁性

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摘要

The results of ~(115)In nuclear quadrupole resonance (NQR) measurements on PuIn_3 are reported. Three of the four NQR lines of ~(115)In expected for nuclear spin I = 9/2 are observed. The equal spacing of these lines at 20 K yields the NQR frequency of νQ = 10.45 MHz, and the asymmetry parameter of the electric field gradient η = 0. The NQR line profile and the nuclear spin-lattice relaxation rate 1/T1 display an abrupt change at 14 K, which is associated with the onset of long-range antiferromagnetic order. The temperature dependences of the staggered magnetization MQ(T), extracted from the NQR spectra, and 1/T1 below TN = 14 K are well explained by the self-consistent renormalization (SCR) theory for spin fluctuations. In addition, the scaling between T1T and MQ(T)/MQ(0) is also consistent with the predictions of SCR theory, providing further evidence that PuIn3 is a weak itinerant antiferromagnet in which spin fluctuations around the antiferromagnetic wavevector play a major role in the system's behavior at finite temperatures.
机译：报告了在PuIn_3上〜（115）In核四极共振（NQR）的测量结果。观察到核自旋I = 9/2的〜（115）In的四个NQR线中的三个。这些线在20 K时的等距间距产生的NQR频率νQ= 10.45 MHz，电场梯度的不对称参数η=0。NQR线轮廓和核自旋晶格弛豫速率1 / T1显示出突变在14 K时发生变化，这与远程反铁磁有序发生有关。从NQR光谱中提取的交错磁化MQ（T）和TN = 14 K以下的1 / T1的温度依赖性通过自洽重整化（SCR）自旋波动理论得到了很好的解释。此外，T1T和MQ（T）/ MQ（0）之间的比例也与SCR理论的预测一致，进一步提供了PuIn3是弱的迭代反铁磁体的证据，其中反铁磁波矢周围的自旋涨落在其中起主要作用。系统在有限温度下的行为。

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