TY - JOUR
T1 - Pressure-Induced Metallization of BaH2 and the Effect of Hydrogenation
AU - Shuttleworth, Hannah A.
AU - Osmond, Israel
AU - Strain, Calum
AU - Binns, Jack
AU - Buhot, Jonathan
AU - Friedemann, Sven
AU - Howie, Ross T.
AU - Gregoryanz, Eugene
AU - Peña-Alvarez, Miriam
N1 - Funding Information:
The authors thank Dr. M. Kuzovnikov for his help with electrical transport measurements. Dr. Miriam Peña-Alvarez and Dr. Israel Osmond acknowledge the support of the UK Research and Innovation (UKRI) Future Leaders Fellowship (Mrc-Mr/T043733/1). The authors thank Prof. M. McMahon for lending us the glovebox of his laboratory to prepare the samples. The authors also thank Prof. A. Huxley for the use of his cryostat. The authors thank beamlines P02.2 at PETRA-III, Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany, and ID15b, European Synchrotron Radiation Facility (ESRF), Grenoble, France, for the use of their facilities. Dr. Ross T. Howie acknowledges that the project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Program (Grant Agreement 948895 “MetElOne”). Dr. Sven Friedemann acknowledges the ERC Horizon 2020 Program (Grant 715262-HPSuper) and the Engineering and Physical Sciences Research Council (EPSRC, Grant EP/V048759/1).
Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.
PY - 2023/12/21
Y1 - 2023/12/21
N2 - Using optical spectroscopy, X-ray diffraction, and electrical transport measurements, we have studied the pressure-induced metallization in BaH2 and Ba8H46. Our combined measurements suggest a structural phase transition from BaH2-II to BaH2-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, BaH2 forms the previously observed Weaire-Phelan Ba8H46, 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.
AB - Using optical spectroscopy, X-ray diffraction, and electrical transport measurements, we have studied the pressure-induced metallization in BaH2 and Ba8H46. Our combined measurements suggest a structural phase transition from BaH2-II to BaH2-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, BaH2 forms the previously observed Weaire-Phelan Ba8H46, 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.
KW - INDUCED PHASE-TRANSITION
KW - HYDRIDE
KW - SUPERCONDUCTIVITY
KW - LANTHANUM
UR - http://www.scopus.com/inward/record.url?scp=85180079450&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.3c02704
DO - 10.1021/acs.jpclett.3c02704
M3 - Article
C2 - 38085985
AN - SCOPUS:85180079450
SN - 1948-7185
VL - 14
SP - 11490
EP - 11496
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 50
ER -