Matter|东南大学最新研究：LK-99材料并没有显示出超导特性

你还记得最近在网络上热传的所谓“首例室温超导体”LK-99吗?东南大学研究团队针对该材料开展了进一步研究,他们合成了铜掺杂的铅磷灰石,通过一系列测试发现,该材料并没有显示出超导特性。

东南大学施智祥、孙悦教授带领团队,在非常短时间内合成了LK-99材料。通过X射线和能谱测试,他们首先发现样品存在多相状态,包含五种不同成分,尤其是铜、铅单质的含量很高。这与原论文报道的成分差异很大。

在后续的电阻率测试中,团队发现样品呈现出四种不同的温度-电阻率关系,部分行为类似“超导转变”。但考虑到多相状态,他们提出这是Cu/Pb颗粒引发的“电流渗流”造成的假象。磁性测量结果也支持这一推论,没有探测到超导所具有的迈斯纳效应。

所以,东大团队总结说,目前没有证据表明该铜掺杂磷灰石材料具备超导性能。LK-99“首例室温超导体”的说法值得进一步验证。探索室温超导依然任重道远!

Cu-doped apatite Pb10−xCux(PO4)6O was synthesized. The crystal structure and composition were determined using X-ray diffraction and energy dispersive X-ray spectroscopy. Both the primary phase and impurities have been successfully identified. We performed temperature-dependent resistivity measurements on the synthesized Pb10−xCux(PO4)6O samples. Remarkably, four distinct types of resistivity behaviors were observed in one sample. Following a thorough compositional analysis, we proposed a current percolation model, based on the formation of a Cu/Pb current channel, to elucidate the observed special resistivity behaviors. It is important to note that the Meissner effect was not observed in our magnetization measurements. Consequently, we reached the conclusion that the presence of superconductivity in Cu-doped apatite has yet to be substantiated.

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