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High-pressure synthesis of seven lanthanum hydrides with a significant variability of hydrogen content

Author

Listed:
  • Dominique Laniel

    (University of Bayreuth
    University of Edinburgh)

  • Florian Trybel

    (Linköping University)

  • Bjoern Winkler

    (Johann Wolfgang-Goethe-Universität Frankfurt)

  • Florian Knoop

    (Linköping University)

  • Timofey Fedotenko

    (University of Bayreuth)

  • Saiana Khandarkhaeva

    (University of Bayreuth)

  • Alena Aslandukova

    (University of Bayreuth)

  • Thomas Meier

    (Center for High Pressure Science & Technology Advanced Research)

  • Stella Chariton

    (University of Chicago)

  • Konstantin Glazyrin

    (Deutsches Elektronen-Synchrotron)

  • Victor Milman

    (Dassault Systèmes BIOVIA)

  • Vitali Prakapenka

    (University of Chicago)

  • Igor A. Abrikosov

    (Linköping University)

  • Leonid Dubrovinsky

    (University of Bayreuth)

  • Natalia Dubrovinskaia

    (University of Bayreuth
    Linköping University)

Abstract

The lanthanum-hydrogen system has attracted significant attention following the report of superconductivity in LaH10 at near-ambient temperatures and high pressures. Phases other than LaH10 are suspected to be synthesized based on both powder X-ray diffraction and resistivity data, although they have not yet been identified. Here, we present the results of our single-crystal X-ray diffraction studies on this system, supported by density functional theory calculations, which reveal an unexpected chemical and structural diversity of lanthanum hydrides synthesized in the range of 50 to 180 GPa. Seven lanthanum hydrides were produced, LaH3, LaH~4, LaH4+δ, La4H23, LaH6+δ, LaH9+δ, and LaH10+δ, and the atomic coordinates of lanthanum in their structures determined. The regularities in rare-earth element hydrides unveiled here provide clues to guide the search for other synthesizable hydrides and candidate high-temperature superconductors. The hydrogen content variability in lanthanum hydrides and the samples’ phase heterogeneity underline the challenges related to assessing potentially superconducting phases and the nature of electronic transitions in high-pressure hydrides.

Suggested Citation

  • Dominique Laniel & Florian Trybel & Bjoern Winkler & Florian Knoop & Timofey Fedotenko & Saiana Khandarkhaeva & Alena Aslandukova & Thomas Meier & Stella Chariton & Konstantin Glazyrin & Victor Milman, 2022. "High-pressure synthesis of seven lanthanum hydrides with a significant variability of hydrogen content," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34755-y
    DOI: 10.1038/s41467-022-34755-y
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    References listed on IDEAS

    as
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