Fe $_{3}$ GeTe $_{2}$多晶和单晶的缺铁和Co替代效应
Effects of Fe deficiency and Co substitution in polycrystalline and single crystals of Fe$_{3}$GeTe$_{2}$
摘要：
Fe $_{3}$ GeTe $_{2}$是具有铁磁基态和最大转变温度$T_{\mathrm{c}}\sim225$ K的二维范德华材料。然而，当合成Fe $_{3}$ GeTe $_{2}$时，经常报道较低的$T_{\mathrm{c}}$值。这归因于晶体结构中2c位点处的Fe的缺乏。在这里，我们调查的Fe缺乏和Co的替代Fe的磁性上的这个系统的效果。我们用化学气相传输法和助熔剂法合成了多晶材料和单晶，其中助熔剂法得到的晶体最大。在Fe位的钴取代被发现显着降低的磁性转变温度。通过化学气相传输生长的Fe $_{3}$ GeTe $_{2}$的晶体，在起始材料中具有$\sim 8\%$过量的Fe，显示出最佳的Fe含量和磁转变温度。
英文摘要：
Fe$_{3}$GeTe$_{2}$ is a two-dimensional van der Waals material with a ferromagnetic ground state and a maximum transition temperature $T_{\mathrm{c}}\sim225$ K. However, when Fe$_{3}$GeTe$_{2}$ is synthesized lower values of $T_{\mathrm{c}}$ are often reported. This is attributed to a deficiency in the Fe at the 2c site in the crystal structure. Here we investigate the effect of Fe deficiency and the substitution of Co for Fe on the magnetic properties of this system. We have synthesized both polycrystalline material and single crystals by chemical vapor transport and the flux method, with the largest crystals obtained using the flux method. Cobalt substitution at the Fe site is found to significantly reduce the magnetic transition temperature. Crystals of Fe$_{3}$GeTe$_{2}$ grown by chemical vapor transport with $\sim 8\%$ excess Fe in the starting materials display an optimum Fe content and magnetic transition temperature.
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