Phase coexistence and metastability in polycrystalline Pr0.2La0.8Fe11.4Al1.6 compound

Phase coexistence and metastability in polycrystalline Pr0.2La0.8Fe11.4Al1.6 compound
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多晶Pr0.2La0.8Fe11.4Al1.6化合物的相共存和亚稳定性

DOI:
10.1088/0953-8984/20/27/275235
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发表时间:
2008-06
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
--
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其他
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对多晶Pr0.2La0.8Fe11.4Al1.6化合物的电阻率、直流磁化率、交流磁化率和磁弛豫进行了研究。在等场磁化强度和交流磁化率测量的基础上,我们提供了相共存(铁磁相在反铁磁矩阵中出现)而不是自旋玻璃的证据,导致在低场下零场冷却热磁化曲线在~ 70 K处观察到一个尖点。根据电阻率结果,铁磁团簇或核随机出现在反铁磁基体中。在中磁场下观察到良好的磁阻对应关系。在这些场作用下,相变温度附近出现了较大的弛豫效应。弛豫速率随温度的不均匀变化清楚地显示了相的成核和生长。在相变过程中表现出明显的亚稳行为,从而在各种磁化曲线上呈现阶梯状行为。
Electrical resistivity, dc magnetization, ac magnetic susceptibility, and magnetic relaxation studies of polycrystalline Pr0.2La0.8Fe11.4Al1.6 compound have been carried out. On the basis of the measurements of isofield magnetization and ac magnetic susceptibility, we provide evidence for phase coexistence (the appearance of the ferromagnetic phase in the antiferromagnetic matrix) rather than a spin glass, resulting in a cusp observed at ∼70 K in the zero-field-cooled thermal magnetization curve under low fields. The ferromagnetic clusters or nuclei appear randomly in the antiferromagnetic matrix according to the electrical resistivity results. An excellent magnetic–resistive correspondence is observed under medium fields. Under these fields large relaxation effects are presented in the vicinity of the phase transition temperature. Nonuniform variation of the relaxation rate with temperature gives a clear picture of the nucleation and growth of phases. Distinct metastable behavior is shown during the phase transition, which brings about the step-like behavior in the various magnetization curves.
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