We present a high-pressure study of van der Waals ferromagnetic metal Fe 3 GeTe 2 through electrical transport and Raman scattering measurements in diamond anvil cells at pressures up to 22.4GPa. Upon compression, the ferromagnetic transition temperature T c manifested by a kink in resistance curve decreases monotonically and becomes undiscernable around P c = 10GPa, indicative of suppression of the itinerant ferromagnetism. Meanwhile, by fitting the low temperature resistance to the Fermi liquid behavior of R = R 0 + AT 2 , we found that R 0 shows a cusp-like anomaly and the coefficient A diverges around P c . These transport anomalies imply a tricritical point as commonly observed in itinerant ferromagnets under pressure. Unexpectedly, the Raman-active E 2 g and A 1 g modes soften remarkably...

中文翻译：

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高压下范德华流动铁磁体Fe 3 GeTe 2的可能三临界行为和异常晶格软化

我们通过在高达22.4GPa的压力下在金刚石砧座中进行电传输和拉曼散射测量，对范德华铁磁性金属Fe 3 GeTe 2进行了高压研究。压缩后，电阻曲线中的扭折所表现出的铁磁转变温度T c单调降低，在P c = 10GPa附近变得难以辨别，表明抑制了迭代铁磁。同时，通过将低温电阻适应于R = R 0 + AT 2的费米液体行为，我们发现R 0呈现尖峰状异常，系数A在P c附近发散。这些传输异常暗示了在压力下流动铁磁体中通常观察到的三临界点。出乎意料的是，拉曼活性E 2 g和A 1 g模式显着软化...