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Isosymmetric phase transitions, ultrahigh ductility, and topological nodal lines in $α−Ag_{2}S$
- Source :
- Physical review / B 102(14), 140101 (2020). doi:10.1103/PhysRevB.102.140101
- Publication Year :
- 2020
- Publisher :
- Inst., 2020.
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Abstract
- Physical review / B 102(14), 140101 (2020). doi:10.1103/PhysRevB.102.140101<br />We report two reversible pressure-induced isosymmetric phase transitions in $α−Ag_{2}S$ that are accompanied by two compressive anomalies at 7.5 and 16 GPa, respectively. The first transition arises from a sudden and drastic puckering of the wrinkled Ag-S layers, which leads to an anomalous structural softening at high pressure and gives rise to the ultrahigh compressive ductility in $α−Ag_{2}S$. The second transition stems from a pressure-driven electronic state crossover from a conventional semiconductor to a topological metal. The band-crossing points near the Fermi energy form a nodal-line structure due to the preservation of the time-reversal and space-inversion symmetries under pressure. Our findings not only reveal the underlying mechanism responsible for the ultrahigh ductility in this class of inorganic semiconductors, but also provide a distinctive member to the growing family of topological metals and semimetals.<br />Published by Inst., Woodbury, NY
- Subjects :
- Condensed Matter::Materials Science
ddc:530
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Physical review / B 102(14), 140101 (2020). doi:10.1103/PhysRevB.102.140101
- Accession number :
- edsair.doi.dedup.....6f01eda7caf20046fe122d337370decd