Dresden 2014 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 8: Multiferroics I (Joint Session with MA, DS, KR, TT)
DF 8.5: Talk
Tuesday, April 1, 2014, 10:30–10:45, BEY 118
Magnetoelectric monopoles in bulk periodic solids — •Michael Fechner1, Eric Bousquet1, Alexander Balatsky2, Nicoal A. Spaldin1, and Lars Nordström3 — 1ETH Zürich, Department for Materials Theory, Zürich, Switzerland — 2NORDITA, KTH Royal Institute of Technology and Stockholm University, Stockholm, Sweden — 3Department of Physics and Astronomy, Uppsala University, Sweden
The magnetoelectric (ME) response is described by a second rank tensor that can be decomposed into irreducible isotropic diagonal, antisymmetric and trace-free part. Here we show that the former component can be identified with a ferroic ordering of magnetoelectric monopoles[1]. We further develop a scheme to calculate the ME monopole in bulk periodic solids, by exploiting similarities to the ferroelectric polarization. Finally, as an example we present results for the series of lithium transition metal phosphate compounds (LiMPO4, with M = Co, Fe and Ni), which include both ferromonopolar and antiferromonopolar ordered cases. We predict for the latter case a q-dependent diagonal ME effect.
[1] N . A. Spaldin et al., PRB 88, 094429 (2013)