Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta 2 Se 8 I

Mu, Qing-Ge; Nenno, Dennis; Qi, Yan-Peng; Fan, Feng-Ren; Pei, Cuiying; ElGhazali, Moaz; Gooth, Johannes; Felser, Claudia; Narang, Prineha; Medvedev, Sergey

doi:10.1103/PhysRevMaterials.5.084201

Title: Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal ${Ta}_{2} {Se}_{8} I$

Journal Article · Mon Aug 09 00:00:00 EDT 2021 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.5.084201· OSTI ID:1812425

Mu, Qing-Ge; Nenno, Dennis; Qi, Yan-Peng; Fan, Feng-Ren; Pei, Cuiying; ElGhazali, Moaz; Gooth, Johannes; Felser, Claudia;

; Medvedev, Sergey

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.

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Research Organization:: Stanford Univ., CA (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); European Research Council (ERC); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Gordon and Betty Moore Foundation; Max Planck Society

Grant/Contract Number:: SC0019140; AC02-05CH11231; 742068; 2018YFA0704300; U1932217; 11974246; GBMF8048

OSTI ID:: 1812425

Alternate ID(s):: OSTI ID: 1852884

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Vol. 5 Journal Issue: 8; ISSN 2475-9953

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal Ta 2 Se 8 I

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Title: Suppression of axionic charge density wave and onset of superconductivity in the chiral Weyl semimetal ${Ta}_{2} {Se}_{8} I$