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arXiv 0908.2405cond-mat.str-el
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Tb5Ge4的短程磁关联

Short-range magnetic correlations in Tb5Ge4

W. Tian, A. Kreyssig, J. L. Zarestky, L. Tan, S. Nandi, A. I. Goldman, T. A. Lograsso, D. L. Schlagel, K. A. Gschneidner, V. K. Pecharsky, R. J. McQueeney

摘要:

本文用单晶中子衍射方法研究了$_5$ $_4$的磁短程关联,它们在低于Neel温度$T_N$ $\approx$ 92 K时具有反铁磁性.在$T_N$以下和以上的宽温度范围内观察到由磁短程关联引起的强漫散射。Tb $_5$ Ge $_4$中的反铁磁有序可以被描述为在$ac$平面中的强耦合铁磁块层,其沿着b轴堆叠,具有弱反铁磁层间耦合。沿$a^*$和$b^*$方向观察到漫散射,表明三维短程相关性。此外,$q$依赖的漫散射是平方洛伦兹的形式,这表明一个强烈的集群磁状态,可能与建议的格里菲斯在Gd $_5$ Ge $_4$相。

英文摘要:

We present a single crystal neutron diffraction study of the magnetic short-range correlations in Tb$_5$Ge$_4$ which orders antiferromagnetically below the Neel temperature $T_N$ $\approx$ 92 K. Strong diffuse scattering arising from magnetic short-range correlations was observed in wide temperature ranges both below and above $T_N$. The antiferromagnetic ordering in Tb$_5$Ge$_4$ can be described as strongly coupled ferromagnetic block layers in the $ac$-plane that stack along the b-axis with weak antiferromagnetic inter-layer coupling. Diffuse scattering was observed along both $a^*$ and $b^*$ directions indicating three-dimensional short-range correlations. Moreover, the $q$-dependence of the diffuse scattering is Squared-Lorentzian in form suggesting a strongly clustered magnetic state that may be related to the proposed Griffiths-like phase in Gd$_5$Ge$_4$.

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