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Tuning from Frustrated Magnetism to Superconductivity in Quasi-One-Dimensional KCr$_3$As$_3$ Through Hydrogen Doping

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arxiv 1905.03360 v1 pith:6HYTQZPG submitted 2019-05-08 cond-mat.supr-con cond-mat.str-el

Keith M. Taddei , Liurukara D. Sanjeewa , Bing-Hua Lei , Yuhao Fu , Qiang Zheng , David J. Singh , Athena S. Sefat , Clarina dela Cruz This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords dopingbathchargequasi-one-dimensionalsamplessuperconductivityannealedarises
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abstract

We report the charge doping of KCr$_3$As$_3$ via H intercalation. We show that the previously reported ethanol bath deintercalation of K$_2$Cr$_3$As$_3$ to KCr$_3$As$_3$ has a secondary effect whereby H from the bath enters the quasi-one-dimensional Cr$_6$As$_6$ chains. Furthermore, we find that - contrary to previous interpretations - the difference between non-superconducting as-grown KCr$_3$As$_3$ samples and superconducting hydrothermally annealed samples is not a change in crystallinity but due to charge doping, with the latter treatment increasing the H concentration in the CrAs tubes effectively electron-doping the 133 compound. These results suggest a new stoichiometry KH$_x$Cr$_3$As$_3$, that superconductivity arises from a suppressed magnetic order via a tunable parameter and pave the way for the first charge-doped phase diagram in these materials.

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Cited by 1 Pith paper

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  1. Lifshitz Transition and Nontrivial H-Doping Effect in Cr-based Superconductor KCr$_3$As$_3$H$_x$

    cond-mat.supr-con 2019-08 conditional novelty 6.0 of 10

    First-principles calculations show that hydrogen in KCr3As3H bonds strongly with chromium and acts as an electron acceptor, yet still effectively electron-dopes the CrAs tubes, and that moderate hole doping drives a L...

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