Control of Polarity in Kagome-NiAs Bismuthides

Quinn D Gibson; Dongsheng Wen; Hai Lin; Marco Zanella; Luke M Daniels; Craig M Robertson; John B Claridge; Jonathan Alaria; Matthew S Dyer; Matthew J Rosseinsky

doi:10.1002/anie.202403670

Control of Polarity in Kagome-NiAs Bismuthides

Angew Chem Int Ed Engl. 2024 Mar 12:e202403670. doi: 10.1002/anie.202403670. Online ahead of print.

Authors

Quinn D Gibson^{1

2}, Dongsheng Wen^{1

2}, Hai Lin^{1

2}, Marco Zanella^{1

2}, Luke M Daniels^{1

2}, Craig M Robertson^{1

2}, John B Claridge^{1

2}, Jonathan Alaria³, Matthew S Dyer^{1

2}, Matthew J Rosseinsky^{1

2}

Affiliations

¹ Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, United Kingdom.
² Aberdeen Centre for Energy and Sustainability, Department of Chemistry, University of Aberdeen, Aberdeen, AB24, 3FX, United Kingdom.
³ Department of Physics, University of Liverpool, Oliver Lodge Laboratory, Liverpool, L69 7ZE, United Kingdom.

PMID: 38470158
DOI: 10.1002/anie.202403670

Abstract

A 2×2×1 superstructure of the P6₃/mmc NiAs structure is reported in which kagome nets are stabilized in the octahedral transition metal layers of the compounds Ni_0.7Pd_0.2Bi, Ni_0.6Pt_0.4Bi, and Mn_0.99Pd_0.01Bi. The ordered vacancies that yield the true hexagonal kagome motif lead to filling of trigonal bipyramidal interstitial sites with the transition metal in this family of "kagome-NiAs" type materials. Further ordering of vacancies within these interstitial layers can be compositionally driven to simultaneously yield kagome-connected layers and a net polarization along the c axes in Ni_0.9Bi and Ni_0.79Pd_0.08Bi, which adopt Fmm2 symmetry. The polar and non-polar materials exhibit different electronic transport behaviour, reflecting the tuneability of both structure and properties within the NiAs-type bismuthide materials family.

Keywords: Intermetallic; Kagome; NiAs; Polar metal.

Grants and funding

EP/V026887/Engineering and Physical Sciences Research Council