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

Author:

Inagaki Kohdai1ORCID,Ishihara Keita1ORCID,Hotta Tomoki1ORCID,Seki Yuichi1,Takeda Takahito1ORCID,Ishida Tatsuhiro2,Ootsuki Daiki2ORCID,Kawasaki Ikuto3ORCID,Fujimori Shin-Ichi3ORCID,Tanaka Masaaki145ORCID,Anh Le Duc146ORCID,Kobayashi Masaki14ORCID

Affiliation:

1. Department of Electrical Engineering and Information Systems, The University of Tokyo 1 , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

2. Graduate School of Human and Environmental Studies, Kyoto University 2 , Kyoto 606-8501, Japan

3. Materials Sciences Research Center, Japan Atomic Energy Agency 3 , Sayo-gun, Hyogo 679-5148, Japan

4. Center for Spintronics Research Network, The University of Tokyo 4 , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

5. Institute for Nano Quantum Information Electronics, The University of Tokyo 5 , 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

6. PRESTO, Japan Science and Technology Agency 6 , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

Abstract

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.

Funder

Japan Science and Technology Agency

Core Research for Evolutional Science and Technology

Precursory Research for Embryonic Science and Technology

Exploratory Research for Advanced Technology

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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