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.
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8 January 2024
Research Article|
January 09 2024
Allotropic transition of Dirac semimetal α-Sn to superconductor β-Sn induced by focused-ion-beam irradiation Available to Purchase
Kohdai Inagaki
;
Kohdai Inagaki
(Data curation, Formal analysis, Investigation, Writing – original draft)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Keita Ishihara
;
Keita Ishihara
(Data curation, Formal analysis, Investigation, Writing – original draft)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Tomoki Hotta
;
Tomoki Hotta
(Data curation, Formal analysis, Investigation, Writing – original draft)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Yuichi Seki;
Yuichi Seki
(Data curation, Formal analysis, Writing – original draft)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Takahito Takeda
;
Takahito Takeda
(Data curation, Formal analysis, Writing – original draft)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Tatsuhiro Ishida;
Tatsuhiro Ishida
(Data curation, Formal analysis, Writing – original draft)
2
Graduate School of Human and Environmental Studies, Kyoto University
, Kyoto 606-8501, Japan
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Daiki Ootsuki
;
Daiki Ootsuki
(Data curation, Formal analysis, Writing – original draft)
2
Graduate School of Human and Environmental Studies, Kyoto University
, Kyoto 606-8501, Japan
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Ikuto Kawasaki
;
Ikuto Kawasaki
(Data curation, Formal analysis, Writing – original draft)
3
Materials Sciences Research Center, Japan Atomic Energy Agency
, Sayo-gun, Hyogo 679-5148, Japan
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Shin-Ichi Fujimori
;
Shin-Ichi Fujimori
(Data curation, Formal analysis, Writing – original draft)
3
Materials Sciences Research Center, Japan Atomic Energy Agency
, Sayo-gun, Hyogo 679-5148, Japan
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Masaaki Tanaka
;
Masaaki Tanaka
(Project administration, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
4
Center for Spintronics Research Network, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
5
Institute for Nano Quantum Information Electronics, The University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Le Duc Anh
;
Le Duc Anh
a)
(Project administration, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
4
Center for Spintronics Research Network, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
6
PRESTO, Japan Science and Technology Agency
, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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Masaki Kobayashi
Masaki Kobayashi
a)
(Project administration, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
4
Center for Spintronics Research Network, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Kohdai Inagaki
1
Keita Ishihara
1
Tomoki Hotta
1
Yuichi Seki
1
Takahito Takeda
1
Tatsuhiro Ishida
2
Daiki Ootsuki
2
Ikuto Kawasaki
3
Shin-Ichi Fujimori
3
Masaaki Tanaka
1,4,5
Le Duc Anh
1,4,6,a)
Masaki Kobayashi
1,4,a)
1
Department of Electrical Engineering and Information Systems, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2
Graduate School of Human and Environmental Studies, Kyoto University
, Kyoto 606-8501, Japan
3
Materials Sciences Research Center, Japan Atomic Energy Agency
, Sayo-gun, Hyogo 679-5148, Japan
4
Center for Spintronics Research Network, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
5
Institute for Nano Quantum Information Electronics, The University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
6
PRESTO, Japan Science and Technology Agency
, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
Appl. Phys. Lett. 124, 021602 (2024)
Article history
Received:
September 21 2023
Accepted:
December 18 2023
Citation
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. Appl. Phys. Lett. 8 January 2024; 124 (2): 021602. https://doi.org/10.1063/5.0177343
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