| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances and Discoveries in Non-equilibrium Driven Nanomaterials and Thin Films
|
| Presentation Title |
Emergence of Shallow Energy Levels in B-doped Q-carbon: A high- temperature Superconductor |
| Author(s) |
Ritesh Sachan, Jagdish Narayan, Jordan Hachtel, Juan Carlos Idrobo |
| On-Site Speaker (Planned) |
Ritesh Sachan |
| Abstract Scope |
We report the spectroscopic demonstration of the shallow-level energy states in the recently discovered B-doped Q-carbon Bardeen-Cooper-Schrieffer (BCS) high-temperature superconductor. The Q-carbon is synthesized by ultrafast melting and quenching, allowing for high B-doping concentrations which in- crease the superconducting transition temperature (Tc) to 36 K (compared to 4 K for B-doped diamond). The increase in Tc is attributed to the increased density of energy states near the Fermi level in B-doped Q-carbon, which give rise to superconducting states via strong electron-phonon coupling below Tc. These shallow-level energy states, however, are challenging to map due to limited spatial and energy resolu- tion. Here, we use ultrahigh energy resolution monochromated electron energy-loss spectroscopy (EELS), to detect and visualize the newly formed shallow-level energy states (vibrational modes) near the Fermi level (ranging 30e100 meV) of the B-doped Q-carbon. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |