无序对原始混合价态磷酸铁磁性的影响
Contrasted role of disorder for magnetic properties in an original mixed valency iron Phosphate
摘要：
我们测量了混合价态磷酸铁的磁性。它提出了一个原始的结构与交叉链含有Fe II和正交的最长方向的微晶。使用电子显微镜的微观结构的调查表明存在随机纳米孪晶。交流磁化率的测量表明与无序的磁性，自旋玻璃状，状态的动力学的相似性，但被证明是基本上是由于这种特殊的障碍。标度特性是三维二级跃迁的特征，这意味着这种无序在小尺度上不会显著影响长程磁有序。在低温下，观察到自发磁化强度的降低和不可逆的变磁转变，这归因于铁链中自旋的倾斜。
英文摘要：
We have measured the magnetic properties of a mixed valency iron phosphate. It presents an original structure with crossed chains containing Fe II and orthogonal to the longest direction of the crystallites. Microstructural investigations using electron microscopy show the presence of random nano-twinning. The ac susceptibility measurements demonstrate similarities with the kinetics of a disordered magnetic, spin-glass like, state but are shown to be essentially due to this peculiar disorder. Scaling properties are characteristics of 3D second order transition implying that this disorder at a small scale does not influence significantly long range magnetic ordering. At low temperature, a decrease of the spontaneous magnetization and an irreversible metamagnetic transition is observed, and is attributed to a canting of the spins in the iron chain.
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