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

Magnetic properties of the Ag–In–rare-earth 1/1 approximants
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Ag-In-稀土 1/1 近似值的磁性

DOI:
10.1088/0953-8984/23/5/056001
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发表时间:
2010
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
Taku J. Sato
Taku J. Sato
中科院分区:
--
文献类型:
--
作者:
S. Ibuka;K. Iida;Taku J. Sato

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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,证实了RE 3+离子的局部各向同性矩。例外的轻稀土元素,如Ce和Pr,观察到的非线性行为,可能是由于显着的晶场分裂或价态波动。对于RE = Tb,磁化率测量清楚地表明,在Tf = 3.7 K的场冷却和零场冷却的磁化率的分叉,表明自旋玻璃状冻结。另一方面,中子散射测量检测显着发展的短程反铁磁自旋相关的弹性通道,这是伴随着在毫电子伏的非弹性散射谱的宽峰。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。
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 RE3 + ions. Exceptionally for the light RE elements, such as Ce and Pr, nonlinear 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 Tf = 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 the elastic channel, which is accompanied by a broad peak at meV in the 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 systems.
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