High-Pressure Synthesis of a Massive and Non-Symmorphic Dirac Semimetal Candidate MoP4
| Autor: | Jon Alexander Richards, Alex Hiro Mayo, Shintaro Ishiwata, Hidefumi Takahashi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Strongly Correlated Electrons (cond-mat.str-el) Magnetoresistance Condensed matter physics Fermi level Dirac (software) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy Electron Semimetal Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science symbols.namesake Seebeck coefficient symbols Condensed Matter::Strongly Correlated Electrons Electronic band structure Single crystal |
| Zdroj: | Journal of the Physical Society of Japan. 90 |
| ISSN: | 1347-4073 0031-9015 |
| DOI: | 10.7566/jpsj.90.123704 |
| Popis: | Single crystal and polycrystalline samples of MoP$_4$ with a black-phosphorus-derived structure have been successfully synthesized by a high-pressure technique. The polycrystalline samples show a large positive magnetoresistance and a small negative Seebeck coefficient at low temperatures, reflecting a semi-metallic nature with high-mobility electrons. Consistent with the transport properties, the band structure calculation reveals a semi-metallic state with the presence of two types of Dirac nodes slightly below the Fermi level. The Dirac node along the $\Gamma$-X direction normal to the phosphorus layers is gapped out in the presence of spin-orbit coupling (SOC), whereas the band crossing at the Z-point is immune to SOC because of the non-symmorphic symmetry. This work demonstrates a great potential of phosphorus-based layered Zintl compounds for topological semimetal candidates allowing chemical band engineering. Comment: 14 pages, 4 figures, 2 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|