Magneto transport and critical behavior in metastable Fe15Cu85

FexCu100-x binary alloys attracted much attention owing to their rich magnetic phase diagram and the challenges of achieving single phases in these systems. Despite early efforts put toward studying the physical properties of low-Cu doping in Fe-Cu alloys, a detailed understanding of the magnetic, structural and electrical properties of high Cu doping in Fe-Cu alloys remains not clear. In this report, we use X-ray diffraction (XRD), scanning electron microscopy, electrical transport and magnetic measurements to gain more insight into Fe15Cu85 single-phase alloy system. Experimental findings show that the samples exhibit a second-order phase transition, which is consistent with the classical mean-field model. Moreover, negative magnetoresistance is observed at all temperatures and explained through classical models.

Automated summary

FexCu100-x binary alloys are attracting attention due to their complex magnetic phase diagram and the difficulty of achieving single phases. While the physical properties of low-Cu doping in Fe-Cu alloys have been studied, the understanding of high Cu doping remains limited. In this study, different techniques including XRD, SEM, electrical transport, and magnetic measurements were used to investigate the Fe15Cu85 single-phase alloy system. The experimental results reveal a second-order phase transition and negative magnetoresistance, which can be explained by classical models.