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Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta2Se8I

MPS-Authors
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Mu,  Qing-Ge
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nenno,  Dennis
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Qi,  Yan-Peng
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Fan,  Feng-Ren
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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ElGhazali,  Moaz
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Gooth,  Johannes
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Medvedev,  Sergey
Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Mu, Q.-G., Nenno, D., Qi, Y.-P., Fan, F.-R., Pei, C., ElGhazali, M., et al. (2021). Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta2Se8I. Physical Review Materials, 5(8): 084201, pp. 1-6. doi:10.1103/PhysRevMaterials.5.084201.


Cite as: http://hdl.handle.net/21.11116/0000-0009-23A8-2
Abstract
A Weyl semimetal with strong electron-phonon interaction can show axionic coupling in its insulator state at low temperatures, owing to the formation of a charge density wave (CDW). Such a CDW emerges in the linear-chain-compound Weyl semimetal Ta2Se8I below 263 K, resulting in the appearance of the dynamical condensed-matter axion quasiparticle. In this paper, we demonstrate that the interchain coupling in Ta2Se8I can be varied to suppress the CDW formation with pressure, while retaining the Weyl semimetal phase at high temperatures. Above 17 GPa, the Weyl semimetal phase does not survive, and we induce superconductivity, due to the amorphization of the iodine sublattice. Structurally, the quasi-one-dimensional Ta-Se chains remain intact and provide a channel for superconductivity. We highlight that our results show a near-complete suppression of the gap induced by the axionic charge density wave at pressures inaccessible to previous studies. Including this CDW phase, our experiments and theoretical predictions and analysis reveal the complete phase diagram of Ta2Se8I and its relationship to the nearby superconducting state. The results demonstrate Ta2Se8I to be a distinctively versatile platform for exploring correlated topological states. © 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.