Soft-mode behavior of electromagnons in multiferroic manganite
| Autor: | V. Yu. Ivanov, Andrei Pimenov, D. Niermann, V. D. Travkin, Alois Loidl, F. Schrettle, Joachim Hemberger, A. M. Shuvaev, A. A. Mukhin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Physics
Phase transition Condensed Matter - Materials Science Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Soft modes Condensed Matter Physics Manganite Ferroelectricity Electronic Optical and Magnetic Materials Magnetic field Condensed Matter::Materials Science Condensed Matter - Strongly Correlated Electrons Spin wave Multiferroics Intensity (heat transfer) |
| Popis: | The behavior of the low-frequency electromagnon in multiferroic DyMnO3 has been investigated in external magnetic fields and in a magnetically ordered state. Significant softening of the electromagnon frequency is observed for external magnetic fields parallel to the a-axis (BIIa), revealing a number of similarities to a classical soft mode behavior known for ferroelectric phase transitions. The softening of the electromagnon yields an increase of the static dielectric permittivity which follows a similar dependence as predicted by the Lyddane-Sachs-Teller relation. Within the geometry BIIb the increase of the electromagnon intensity does not correspond to the softening of the eigenfrequency. In this case the increase of the static dielectric permittivity seem to be governed by the motion of the domain walls. 5 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|