Anti-ferromagnetic correlations in UPt3

Physica B+C Pub Date : 1988-08-01 DOI:10.1016/0378-4363(88)90303-8

P. Frings , B. Renker , C. Vettier

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引用次数: 15

Abstract

We report on polarised as well as unpolarised neutron scattering experiments on two single-crystalline samples of UPt₃ from different sources. Previously reported magnetic intensity, probably due to anti-ferromagnetic correlations with relatively high characteristic energies (of the order of 5–8 meV) along the c-axis of the hexagonal structure, was observed in both samples. However, the ratio of the magnetic intensity to the phonon intensity was found to be a factor of five less than suggested by other authors. The magnetic character of the observed scattering was unambiguously proved by means of polarised neutron scattering. Furthermore, we observed in both samples a temperature-dependent quasi-elastic response for Q-values in the neighbourhood of the magnetic satellite positions for the anti-ferromagnetically ordered compounds U_0.95Th_0.05Pt₃ and U(Pt_0.95Pd_0.05)₃. This indicates anti-ferromagnetic correlations in the basal plane along the a^∗-axis in pure UPt₃. Moreover, we observed in only one of the samples long-range anti-ferromagnetic order with an ordered moment of the order of 0.01μ_B and a Néel temperature of about 5 K.

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UPt3中的反铁磁相关

本文报道了两种不同来源的UPt3单晶样品的极化和非极化中子散射实验。在这两个样品中都观察到先前报道的磁场强度，可能是由于沿六角形结构的c轴具有相对高的特征能量(5-8 meV)的反铁磁相关性。然而，磁强度与声子强度之比被发现比其他作者提出的要小五倍。用极化中子散射的方法明确地证明了所观察到的散射的磁性。此外，我们在两个样品中观察到反铁磁有序化合物U0.95Th0.05Pt3和U(Pt0.95Pd0.05)3在磁卫星位置附近的q值具有温度相关的准弹性响应。这表明在纯UPt3中沿a *轴的基面上存在反铁磁相关性。此外，我们只在其中一个样品中观察到远端反铁磁有序，有序矩约为0.01μB, n温度约为5 K。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica B+C

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