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Title: A new form of Ca3P2 with a ring of Dirac nodes

Journal Article · · APL Materials
DOI:https://doi.org/10.1063/1.4926545· OSTI ID:1193515

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
W911NF-12-1-0461; DMR 1420541; AC02-06CH11357
OSTI ID:
1193515
Alternate ID(s):
OSTI ID: 1225057; OSTI ID: 1421213
Journal Information:
APL Materials, Journal Name: APL Materials Vol. 3 Journal Issue: 8; ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 262 works
Citation information provided by
Web of Science

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