Field and temperature dependence of electromagnon scattering in ${\text{TbMnO}}_{3}$ studied by inelastic neutron scattering

Holbein, S.; Link, P.; Komarek, A. C.; Steffens, P.; Sidis, Y.; Braden, M.; Finger, T.

doi:10.1103/PhysRevB.91.014432

Journal Article

IMPULSE-2015-00044

Field and temperature dependence of electromagnon scattering in ${\text{TbMnO}}_{3}$ studied by inelastic neutron scattering

Holbein, S. (Corresponding Author) ; Steffens, P. ; Finger, T. ; Komarek, A. C. ; Sidis, Y. ; Link, P.MLZ* ; Braden, M.

2015
APS College Park, Md.

Physical review / B 91(1), 014432 (2015) [10.1103/PhysRevB.91.014432]

Please use a persistent id in citations: doi:10.1103/PhysRevB.91.014432

Abstract: Inelastic neutron scattering techniques have been used to study the field-induced multiferroic transition and the temperature dependence of magnetic excitations in TbMnO3. The significant changes in the spin-wave spectra across the field-induced transition perfectly agree with a rotation of the cycloidal spiral plane and with efficient pinning in the commensurate high-field phase. Further analysis of the Q dependence allows the identification of an electromagnon in the multiferroic high-field phase whose energy and polarization precisely matches previous infrared data. This and the zero-field temperature dependence of a zone-center magnon, which exactly agrees with that of an optically detected excitation, document that the inverse Dzyaloshinskii-Moriya interaction induces an electromagnon hybrid excitation in TbMnO3.

Keyword(s): Basic research (1st) ; Others (1st) ; Information Technology and Functional Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)