Canonical magnetic insulators with isotropic magnetoelectric coupling

Sinisa Coh, David Vanderbilt

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

We have performed a systematic representation-theory-based search for the simplest structures allowing isotropic magnetoelectric coupling. We find 30 such structures, all sharing a common pattern of atomic displacements in the direction of atomic magnetic moments. We focus on one of these 30 canonical structures and find that it is generically realized in a class of fractionally substituted pyrochlore compounds with an all-in-all-out magnetic order. Furthermore, we find that these substituted pyrochlore compounds have a substantial Chern-Simons orbital magnetoelectric component (θ=0.1-0.2). While this component is also formally present in strong Z2 topological insulators (θ=π), its effects are observable there only if time-reversal symmetry is broken at the surface.

Original languageEnglish (US)
Article number121106
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number12
DOIs
StatePublished - Sep 23 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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