Computational Design of Axion Insulators Based on 5d Spinels Compounds

Details Computational Design of Axion Insulators Based on 5d Spinels Compounds Computational Design of Axion Insulators Based on 5d Spinels Compounds

2011-03-23

arxiv.org/abs/1103.4634v1

Phys. Rev. Lett. 108, 146601 (2012)

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

Based on density functional calculation with LDA+U method, we propose that hypothetical Osmium compounds such as CaOs2O4 and SrOs2O4 can be stabilized in the geometrically frustrated spinel crystal structure. They also show some exotic electronic and magnetic properties in a reasonable range of on-site Coulomb correlation U such as ferromagnetism and orbital magnetoelectric effect characteristic to Axion electrodynamics. Other electronic phases including 3D Dirac metal and Mott insulator exist and would make perspective 5d spinels ideal for applications.

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