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A new form of Ca3P2 with a ring of Dirac nodes
Open accessAbstract
We report the synthesis and crystal structure of a new high-temperature form of Ca3P2. The crystal structure was determined through Rietveld refinements of synchrotron powder x-ray diffraction data. This form of Ca3P2 has a crystal structure of the hexagonal Mn5Si3 type, with a Ca ion deficiency compared to the ideal 5:3 stoichiometry. This yields a stable, charge-balanced compound of Ca2+ and P3−. We also report the observation of a secondary hydride phase, Ca5P3H, which again is a charge-balanced compound. The calculated band structure of Ca3P2 indicates that it is a three-dimensional Dirac semimetal with a highly unusual ring of Dirac nodes at the Fermi level. The Dirac states are protected against gap opening by a mirror plane in a manner analogous to what is seen for graphene.
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“Other proposals include a new form of Ca3P2 (Xie et al., 2015).”
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Metadata
- Authors
- Xie, L. S., Schoop, L. M., Seibel, E. M., Gibson, Q. D., Xie, W., & Cava, R. J.
- Venue
- APL Materials
- Publisher
- AIP Publishing
- Published
- 2015-07-09
- Volume
- 3
- Issue
- 8
- ISSN
- 2166-532X (ISSN-L)
- OpenAlex
- W1593031956
- Cited by
- 333
- References
- 34
- FWCI
- 26.15
- Type
- journal article
- Language
- en
- Open access
- gold
- Licence
- creativecommons.org/licenses/by/3.0/ (vor)
- creativecommons.org/licenses/by/3.0/ (tdm)
- Funders
- National Science Foundation (DMR 1420541)
- Army Research Office (W911NF-12-1-0461)
- U.S. Department of Energy (DE-AC02-06CH11357)
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- Xie, L. S., Schoop, L. M., Seibel, E. M., Gibson, Q. D., Xie, W., & Cava, R. J. (2015). A new form of Ca3P2 with a ring of Dirac nodes. APL Materials. https://doi.org/10.1063/1.4926545
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