论文标题
掺杂钠的T-碳超导性
Superconductivity in sodium-doped T-carbon
论文作者
论文摘要
在2011年，已提出了T-碳作为一种新的碳同质量，该碳在最近的实验中已成功合成。由于其蓬松的结构，可以将几种原子相互插入到T碳中，使其成为各种应用中的多才多艺候选者，例如氢存储，钙钛矿太阳能电池，锂离子电池，热电学，热量催化剂，光催化剂等。在14 GPA的压力下，将增强到19 K，这是由于随着压力的增加而导致的电子 - 音波耦合增强导致的电子偶联。对特定热，电和热导率的计算表明，Na掺杂的T碳超导体的正常状态揭示了非Fermi液体行为。 NA掺杂的T碳超导性的预测在实验和理论上都会引起极大的兴趣，以探索新型的碳基超导体。
T-carbon has been proposed as a new carbon allotrope in 2011, which was successfully synthesized in recent experiments. Because of its fluffy structure, several kinds of atoms can be intercalated into T-carbon, making it a versatile candidate in various applications such as hydrogen storage, perovskite solar cells, lithium ion batteries, thermoelectrics, photocatalyst, etc. Here we show that superconductivity can appear in Na-doped T-carbon with superconducting transition temperature Tc of 11 K at ambient pressure, and Tc can be enhanced to 19 K under pressure of 14 GPa, which results from an enhancement of the electron-phonon coupling due to the shift of the phonon spectral weight to lower frequencies with the increase of pressure. The calculations on specific heat and electrical and thermal conductivities show that the normal state of the Na-doped T-carbon superconductor reveals a non-Fermi liquid behavior. The prediction of superconductivity in Na-doped T-carbon would spur great interest both experimentally and theoretically to explore novel carbon-based superconductors.
