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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Neutron scattering study on spin correlations and fluctuations in the transition-metal-based magnetic quasicrystal Zn-Fe-Sc
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Neutron scattering study on spin correlations and fluctuations in the transition-metal-based magnetic quasicrystal Zn-Fe-Sc

机译：中子散射研究过渡金属基磁性准晶体Zn-Fe-Sc中的自旋相关性和涨落

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摘要

Spin correlations and fluctuations in the 3d-transition-metal-based icosahedral quasicrystal Zn-Fe-Sc have been investigated by neutron scattering using polycrystalline samples. Magnetic diffuse scattering has been observed in the elastic experiment at low temperatures, indicating development of static short-range-spin correlations. In addition, the inelastic scattering experiment detects a Q-independent quasielastic signal ascribed to single-site relaxational spin fluctuations. Above the macroscopic freezing temperature T_f≈7 K, the spin relaxation rate shows Arrhenius-type behavior, indicating thermally activated relaxation process. In contrast, the relaxation rate remains finite even at the lowest temperature, suggesting a certain quantum origin for the spin fluctuations below T_f.
机译：使用多晶样品通过中子散射研究了基于3d过渡金属的二十面体准晶体Zn-Fe-Sc的自旋相关性和涨落。在低温下的弹性实验中已观察到磁扩散散射，表明静态短程自旋相关性的发展。另外，非弹性散射实验检测到归因于单点弛豫自旋涨落的与Q无关的准弹性信号。在宏观冻结温度T_f≈7K之上，自旋弛豫速率显示出Arrhenius型行为，表明热激活了弛豫过程。相反，即使在最低温度下，弛豫率也仍然是有限的，这表明对于低于T_f的自旋涨落具有一定的量子起源。

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