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arXiv 0811.1391cond-mat.str-el
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易平面型反铁磁体ErNi $_{2}$ Ge $_{2}$的各向异性磁漫散射

Anisotropic magnetic diffuse scattering in an easy-plane type antiferromagnet ErNi$_{2}$Ge$_{2}$

Y Tabata, T Yamazaki, M Okue, H Nakamura, M Matsuura

摘要:

本文报道了稀土金属间化合物ErNi $_{2}$ Ge $_{2}$的中子散射研究。极化中子散射实验表明磁有序矩${\bm m}$位于ab平面。由于ErNi $_{2}$ Ge $_{2}$没有三次高次谐波反射,因此认为它具有螺旋磁结构。沿$[100]^{\ast}$ -和$[110]^{\ast}$ -方向的磁散射剖面由高斯项和修正洛伦兹项之和很好地描述,甚至远低于$T_{\scriptsize N}$,表明短程有序与长程序共存。有趣的是,修改的洛伦兹型漫散射不存在于沿$[001]^{\ast}$方向的轮廓。漫散射的各向异性表明短程有序由沿c轴的一维长程螺旋组成。

英文摘要:

We report on neutron scattering studies of a rare earth intermetallic compound ErNi$_{2}$Ge$_{2}$. Polarized neutron scattering experiments revealed that the magnetic ordered moment ${\bm m}$ lies in ab-plane. Taking account of a lack of the third higher harmonic reflection, ErNi$_{2}$Ge$_{2}$ is considered to have a helical magnetic structure. The magnetic scattering profiles along the $[100]^{\ast}$- and the $[110]^{\ast}$-directions are well described by the sum of Gaussian and modified-Lorentzian terms, even far below $T_{\scriptsize N}$, indicating that short-range orders coexist with a long-range order. Interestingly, the modified-Lorentzian-type diffuse scattering is not present in the profiles along the $[001]^{\ast}$-direction. The anisotropy of the diffuse scattering suggests that the short-range-order consists of one dimensional long-range helices along the c-axis.

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