Journal Article

PUBDB-2024-00224

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Pressure-Induced Metallization of BaH$_2$ and the Effect of Hydrogenation

Shuttleworth, H. A.Extern* ; Osmond, I.Extern* ; Strain, C.Extern* ; Binns, J.Extern* ; Buhot, J.Extern* ; Friedemann, S.Extern* ; Howie, R.Extern* ; Gregoryanz, E. (Corresponding author)Extern* ; Peña-Alvarez, M.

2023
ACS Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.jpclett.3c02704  doi:10.3204/PUBDB-2024-00224

Abstract: Using optical spectroscopy, X-ray diffraction, and electrical transport measurements, we have studied the pressure-induced metallization in BaH$_2$ and Ba$_8$H$_{46}$. Our combined measurements suggest a structural phase transition from BaH$_2$-II to BaH$_2$-III accompanied by band gap closure and transformation to a metallic state at 57 GPa. The metallization is confirmed by resistance measurements as a function of the pressure and temperature. We also confirm that, with further hydrogenation, BaH$_2$ forms the previously observed Weaire–Phelan Ba$_8$H$_{46}$, synthesized at 45 GPa and 1200 K. In this compound, metallization pressure is shifted to 85 GPa. Through a comparison of the properties of these two compounds, a question is raised about the importance of the hydrogen content in the electronic properties of hydride systems.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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