Atomic and magnetic short-range order in a Pt-8.8 at. % Mn spin-glass alloy
Atomic and magnetic short-range order in a Pt-8.8 at. % Mn spin-glass alloy
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原子%20and%20磁性%20短程%20有序%20in%20a%20Pt-8.8%20at.%20%%20Mn%20自旋玻璃%20合金
DOI：
10.1103/physrevb.61.3528
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发表时间：
2000
影响因子：
3.7
通讯作者：
Yousuke Watanabe
中科院分区：
文献类型：
--
作者：
Miwako Takahashi;S. Yoshimi;K. Ohshima;Yousuke Watanabe
无序Pt\char21{}8.8 at的x射线和中子散射强度。对% Mn自旋玻璃合金进行了测量，以获得原子和磁性短程有序引起的结构波动信息。在（100）、（110）及其等效位置观察到弥散最大值。在x射线和中子衍射图上的$(1/2,1/2,1/2)$及其等效位置也发现了额外的漫射散射。通过对x射线散射强度数据的分析，得到了Warren-Cowley原子近程序（ASRO）参数。利用实验确定的ASRO参数估计重建的散射强度分布，推导出相关长度约为$15\AA{}$。中子散射结果表明，在$（1/2,0,0）附近出现磁扩散极大值。{T}_{\ mathm {g}}在远高于冰点的温度下，磁峰消失，在此温度下，磁化率测量中观察到一个尖峰型峰。从费米表面嵌套效应引起的自旋密度波（SDW）的角度讨论了扩散散射的起源。Pt-Mn合金的类自旋玻璃行为可以用SDW簇的动态波动模型来解释。
The x-ray and neutron diffuse scattering intensities from a disordered Pt\char21{}8.8 at. % Mn spin-glass alloy were measured to obtain information about structural fluctuations due to atomic and magnetic short-range order. Diffuse maxima have been observed at the (100), (110) and their equivalent positions. Additional diffuse scatterings are also found at $(1/2,1/2,1/2)$ and its equivalent positions on the x-ray and neutron diffraction patterns at room temperature. Warren-Cowley atomic short-range order (ASRO) parameters were obtained by analyzing the x-ray diffuse intensity data. The correlation length has been deduced to be about $15\AA{}$ from estimating the reconstructed diffuse intensity distribution using the ASRO parameters determined experimentally. The neutron scattering result shows that a magnetic diffuse maximum appears at around $(1/2,0,0).$ The magnetic peak disappears at temperature far above the freezing temperature ${T}_{\mathrm{g}}$ at which a cusp-type peak is observed in the magnetic susceptibility measurement. The origin of the diffuse scattering is discussed in terms of a spin-density wave (SDW) induced by a Fermi surface nesting effect. The spin-glass-like behavior of Pt-Mn alloys is interpreted by the model of dynamically fluctuating SDW clusters as proposed for other metallic spin-glass alloys.