Potential ring of Dirac nodes in a new polymorph of Ca$_3$P$_2$
Potential ring of Dirac nodes in a new polymorph of Ca$_3$P$_2$
We report the crystal structure of a new polymorph of Ca$_3$P$_2$, and an analysis of its electronic structure. The crystal structure was determined through Rietveld refinements of powder synchrotron x-ray diffraction data. Ca$_3$P$_2$ is found to be a variant of the Mn$_5$Si$_3$ structure type, with a Ca ion deficiency compared …