Benjamin Shermane M
The National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States.
ACS Mater Au. 2022 Jul 13;2(4):436-439. doi: 10.1021/acsmaterialsau.2c00015. Epub 2022 Mar 17.
Superconductivity in two single-element intercalated compounds has been investigated with the van der Waals equation. For Cu TiSe and YBaCuO , the van der Waals term characterizing the attractive energy per particle (i.e., electrons), /, is calculated from concentration-dependent transition temperature plots derived from experiment. It is shown that two times the attractive energy per intercalant valence electron (2 / ) is equal to the energy gap predicted by BCS theory (Δ) for these superconductors. This realization allows another way to estimate the energy gap of superconducting intercalated insulators and semiconductors, this time, directly from physical real-space properties of the superconductor and the applied external pressure. The physical properties of importance are shown to be the intercalant concentration, transition temperature, and the number of intercalant valence electrons per unit cell volume.
利用范德瓦尔斯方程对两种单元素插层化合物中的超导性进行了研究。对于Cu TiSe和YBaCuO，表征每个粒子（即电子）吸引能的范德瓦尔斯项/，是根据实验得出的浓度依赖转变温度图计算得出的。结果表明，对于这些超导体，每个插层价电子的吸引能的两倍（2 / ）等于BCS理论预测的能隙（Δ）。这一认识提供了另一种估计超导插层绝缘体和半导体能隙的方法，这次是直接从超导体的物理实空间特性和外加压力来估计。重要的物理性质显示为插层剂浓度、转变温度以及每单位晶胞体积的插层剂价电子数。
