Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nanoscale. 2012 May 21;4(10):3032-5. doi: 10.1039/c2nr12018f. Epub 2012 Apr 5.
Based on first-principles lattice dynamics and electron-phonon coupling calculations, B(2)C sheets are predicted to be a two-dimensional (2D) phonon-mediated superconductors with a relatively high transition temperature (T(c)). The electron-phonon coupling parameter was calculated to be 0.92 and it is mainly contributed by low frequency out-of-plane phonon modes and electronic states with a π character. When the Coulomb pseudopotential, μ*, is set to 0.10, the estimated temperature, T(c), is 19.2 K. To the best of our knowledge, B(2)C is the first pristine 2D superconductor with a T(c) higher than the boiling point of liquid helium.
基于第一性原理晶格动力学和电子-声子耦合计算，预测 B(2)C 薄片是一种二维（2D）声子介导的超导体，具有相对较高的转变温度（T(c)）。电子-声子耦合参数计算为 0.92，主要由低频率的面外声子模式和具有 π 特征的电子态贡献。当库仑赝势μ*设置为 0.10 时，估计的温度 T(c)为 19.2 K。据我们所知，B(2)C 是第一个具有高于液氦沸点的 T(c)的纯净 2D 超导体。
