Recently, 2D Mo₂C, a new member of the MXene family, has attracted much attention due to the exotic superconducting properties discovered in 2D α-Mo₂C. Here, not only 2D α-Mo₂C but also 2D β-Mo₂C crystal sheets with distinct disordered carbon distributions were successfully grown. 2D β-Mo₂C shows a much stronger superconductivity than 2D α-Mo₂C, and their superconductivities have different hydrostatic pressure responses. The superconducting transition temperature T_c of 2D α-Mo₂C shows a dome-shaped profile under pressure, implying the existence of two competing effects arising from phononic and electronic properties, while for 2D β-Mo₂C, T_c decreases monotonically with increasing pressure, possibly due to phonon stiffening. These results indicate that the electronic properties have a more important influence on the superconductivity in 2D α-Mo₂C compared to 2D β-Mo₂C. The ordered and disordered carbon distributions in 2D α-Mo₂C and β-Mo₂C, respectively, may be the underlying origin for their different electronic and superconducting properties.

近日，2D莫₂ ℃时，MXene家族的新成员，备受关注由于2D发现了异国情调的超导性能α -Mo ₂ C.在这里，不仅2D α -Mo ₂ C，但也2D β -Mo具有明显无序碳分布的₂ C晶体片成功生长。2D β -Mo ₂ C表示一个比2D强得多超导α -Mo ₂ C，以及它们的超导电性具有不同的流体静压力的响应。超导转变温度Ť _Ç 2D的α -Mo ₂C显示在压力下的圆顶形轮廓，这意味着从声子和电子特性而产生两种相互竞争的效应的存在，而对于2D β -Mo ₂ C，Ť _Ç随着压力的增加而单调减小，可能是由于声子硬化。这些结果表明，在电子性质对在2D中的超导一个更重要的影响α -Mo ₂则为C至2D β -Mo ₂ C.有序和在2D无序碳分布α -Mo ₂ C和β -Mo ₂C分别可能是其不同的电子和超导特性的潜在起源。