Kohdai Inagaki, Keita Ishihara, Tomoki Hotta, Yuichi Seki, Takahito Takeda, Tatsuhiro Ishida, Daiki Ootsuki, Ikuto Kawasaki, Shin-Ichi Fujimori, Masaaki Tanaka, Le Duc Anh, Masaki Kobayashi

Allotropic transition of Dirac semimetal α-Sn to superconductor β-Sn induced by focused-ion-beam irradiation

  • Physics and Astronomy (miscellaneous)

Diamond-type structure allotrope α-Sn is attracting much attention as a topological Dirac semimetal (TDS). In this study, we demonstrate that α-Sn undergoes a phase transition to another allotrope β-Sn with superconductivity at low temperature by irradiating with a focused Ga ion beam (FIB). To clarify the transition mechanism, we performed x-ray photoemission spectroscopy (XPS) measurements on an α-Sn thin film irradiated with FIB and an as-grown α-Sn thin film. The XPS results suggest that the local annealing, which is one of the side effects of FIB, causes the transformation from α-Sn into β-Sn. Furthermore, the difference in the chemical states between α-Sn and β-Sn can be quantitatively explained by the crystal structures rather than the degree of metallicity reflecting the conductivity. These results propose a way of fabricating TDS/superconductor in-plane heterostructures based on α-Sn and β-Sn.

Need a simple solution for managing your BibTeX entries? Explore CiteDrive!

  • Web-based, modern reference management
  • Collaborate and share with fellow researchers
  • Integration with Overleaf
  • Comprehensive BibTeX/BibLaTeX support
  • Save articles and websites directly from your browser
  • Search for new articles from a database of tens of millions of references
Try out CiteDrive

More from our Archive