Abstract
We report our investigations on the effects of pressure on the electronic and magnetic properties of magnetic Dirac semimetal by using electrical transport, synchrotron x-ray diffraction, and x-ray absorption spectroscopy. The antiferromagnetic interaction due to the Eu magnetic moment in is enhanced under pressure up to . The Néel temperature () is found to disappear above 4 GPa and a new transition at around 29 K emerges above 6 GPa. remains relatively constant up to 15 GPa, above which it increases with further compression, reaching at 22 GPa. Eu -edge x-ray absorption spectroscopy revealed a valence change of Eu toward a trivalent state that begins above 6 GPa, which indicates that is likely related to the valence transition temperature of Eu. Sign reversal of the Hall resistivity above 7 GPa suggests that the valence change of Eu also induces a Fermi surface modification.
1 More- Received 23 June 2021
- Revised 28 August 2021
- Accepted 23 September 2021
DOI:https://doi.org/10.1103/PhysRevResearch.3.043028
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Published by the American Physical Society