What question did this study set out to answer?

Synthesize and determine the crystal structure and electronic band properties of a new high-temperature phase of Ca3P2.

July 9, 2015APL MaterialsOpen Access

A new form of Ca3P2 with a ring of Dirac nodes

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Synthesize and determine the crystal structure and electronic band properties of a new high-temperature phase of Ca3P2.
Synthesized a high-temperature form of Ca3P2 and solved its crystal structure using Rietveld refinement of synchrotron powder x-ray diffraction data.
Calculated the electronic band structure to evaluate topological Dirac states, symmetry protections, and nodal features near the Fermi level.
Identified a hexagonal Mn5Si3-type crystal structure with a Ca ion deficiency that yields a stable, charge-balanced Ca2+ and P3- compound, along with a secondary Ca5P3H hydride phase.
Demonstrated that Ca3P2 is a three-dimensional Dirac semimetal characterized by a ring of Dirac nodes at the Fermi level, protected against gap opening by a crystal mirror plane analogous to graphene.

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Implication

Materials synthesis and crystallographic analysis reveal a high-temperature form of Ca3P2 with a Dirac nodal ring, indicating topological semimetallic states protected by mirror symmetry.

Cite This Study

Xie et al. (2015) studied this question.

synapsesocial.com/papers/6a007e7a4716aad0cc85b7d1 https://doi.org/10.1063/1.4926545

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Implication

Materials synthesis and crystallographic analysis reveal a high-temperature form of Ca3P2 with a Dirac nodal ring, indicating topological semimetallic states protected by mirror symmetry.

A new form of Ca3P2 with a ring of Dirac nodes

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Discussion

Implication

Cite This Study

A new form of Ca3P2 with a ring of Dirac nodes

Key Points

Discussion

Implication

Cite This Study

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