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

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.

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 Creators:
Mu, Qing-Ge1, Author              
Nenno, Dennis1, Author              
Qi, Yan-Peng1, Author              
Fan, Feng-Ren1, Author              
Pei, C.2, Author
ElGhazali, Moaz1, Author              
Gooth, Johannes1, Author              
Felser, Claudia3, Author              
Narang, P.2, Author
Medvedev, Sergey4, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              
4Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863438              

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Free keywords: Charge density; Charge density waves; Electron-phonon interactions; Selenium compounds, Condensed matter; High temperature; Interchain coupling; Low temperatures; Quasi particles; Quasi-one dimensional; Superconducting state; Topological state, Tantalum compounds
 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.

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Language(s): eng - English
 Dates: 2021-08-092021-08-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevMaterials.5.084201
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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mater.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: - Volume / Issue: 5 (8) Sequence Number: 084201 Start / End Page: 1 - 6 Identifier: ISSN: 2475-9953
CoNE: https://pure.mpg.de/cone/journals/resource/2475-9953