Stability-superconductivity map for compressed Na-intercalated graphite

ORAL

Abstract

We investigate the stability and superconductivity of compressed Na-intercalated graphite using advanced structure search and Migdal-Eliashberg methods. In addition to the previously proposed NaC4 superconductor with a critical temperature (Tc) around 40 K in the 5-10 GPa range, we identify new synthesizable Na3C10, NaC8, and NaC12 compounds and map pressure-composition conditions defining high-Tc superconductivity driven by the nearly-free-electron-like intercalant states. We demonstrate that NaC4 has a distinct two-gap structure unusual for electron-doped materials and that Na3C10 is an equally promising superconductor.

*This work was supported by National Science Foundation (NSF) Grant No. DMR-2035518 and DMR-2320073. The computational resources were provided by the Frontera supercomputer at the Texas Advanced Computing Center via the Leadership Resource Allocation (LRAC) Grant No. 2103991 (allocation DMR22004).

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Presenters

  • Shashi Bhusan Mishra

    • Binghamton University

Authors

  • Shashi Bhusan Mishra

    • Binghamton University

  • Edan Marcial

    • Binghamton University

  • Suryakanti Debata

    • Howard University

  • Aleksey N Kolmogorov

    • Binghamton University

  • Roxana Margine

    • Binghamton University