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Sinusoidal electromagnon in RMnO3: Indication of anomalous magnetoelectric coupling

Markku Stenberg (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; R. de Sousa
Physical Review B (1098-0121). Vol. 85 (2012), 10, p. Article Number: 104412 .
[Artikel, refereegranskad vetenskaplig]

The optical spectra in the family of multiferroic manganites RMnO3 is a great puzzle. Current models cannot explain the fact that two strong electromagnons are present in the noncollinear spin cycloidal phase, with only one electromagnon surviving the transition into the collinear spin sinusoidal phase. We show that this is a signature of the presence of anomalous magnetoelectric coupling that breaks rotational invariance in spin space and generates oscillatory polarization in the ground state.

Nyckelord: multiferroics, manganites

Denna post skapades 2012-04-12. Senast ändrad 2016-07-21.
CPL Pubid: 156577


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik



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