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arXiv 1010.1114cond-mat.mtrl-sci
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Ag-In-稀土1/1近似化合物的磁性

Magnetic properties of the Ag-In-rare-earth 1/1 approximants

Soshi Ibuka, Kazuki Iida, Taku J Sato

摘要:

我们对Ag-In-RE(RE:稀土)1/1多晶近似体进行了磁化率和中子散射测量。在磁化率测量中,对于大多数RE元素,逆磁化率在宽的温度范围内显示出线性行为,确认RE $^{3+}$离子的局部各向同性矩。例外的轻稀土元素,如Ce和Pr,观察到非线性行为,可能是由于显着的晶场分裂或价态波动。对于RE = Tb,磁化率测量清楚地显示出在$T_{\rm f} = 3.7$ ~K处场冷和零场冷磁化率的分叉,表明自旋玻璃状冻结。另一方面,中子散射测量发现在弹性通道中短程反铁磁自旋关联的显著发展,在非弹性散射谱中伴随着$\hbarω= 4$ ~meV处的宽峰。这些特征与Zn-Mg-Tb准晶中的特征具有惊人的相似性,这表明短程自旋冻结行为是由于两个系统中常见的局部高对称性团簇。

英文摘要:

We have performed magnetic susceptibility and neutron scattering measurements on polycrystalline Ag-In-RE (RE: rare-earth) 1/1 approximants. In the magnetic susceptibility measurements, for most of the RE elements, inverse susceptibility shows linear behaviour in a wide temperature range, confirming well localized isotropic moments for the RE$^{3+}$ ions. Exceptionally for the light RE elements, such as Ce and Pr, non-linear behaviour was observed, possibly due to significant crystalline field splitting or valence fluctuation. For RE = Tb, the susceptibility measurement clearly shows a bifurcation of the field-cooled and zero-field-cooled susceptibility at $T_{\rm f} = 3.7$~K, suggesting a spin-glass-like freezing. On the other hand, neutron scattering measurements detect significant development of short-range antiferromagnetic spin correlations in elastic channel, which accompanied by a broad peak at $\hbarω= 4$~meV in inelastic scattering spectrum. These features have striking similarity to those in the Zn-Mg-Tb quasicrystals, suggesting that the short-range spin freezing behaviour is due to local high symmetry clusters commonly seen in both the systems.

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