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Superconductivity induced by doping holes in the nodal-line semimetal NaAlGe
- Source :
- Phys. Rev. Materials, 2023
- Publication Year :
- 2023
-
Abstract
- The nodal-line semimetals NaAlSi and NaAlGe have significantly different ground states despite having similar electronic structures: NaAlSi exhibits superconductivity below 7 K, while NaAlGe exhibits semiconductive electrical conductivity at low temperatures, indicating the formation of a pseudogap at approximately 100 K. The origin of the pseudogap in NaAlGe is unknown but may be associated with excitonic instability. We investigated hole-doping effects on the ground state in the solid solution Na(Al1-xZnx)Ge and discovered that the pseudogap is suppressed continuously with increasing Zn content, followed by the appearance of a superconducting dome with the highest transition temperature of 2.8 K. This superconductivity most likely results from excitonic fluctuations.<br />Comment: 7 pages, 9 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Materials, 2023
- Publication Type :
- Report
- Accession number :
- edsarx.2310.04040
- Document Type :
- Working Paper