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Spin-phonon coupling in multiferroic YbMnO(3) studied by Raman scattering
H Fukumura1, N Hasuike, H Harima
1Department of Electronics, Kyoto Institute of Technology, Kyoto 606-8585, Japan.
Summary
Raman scattering reveals spin-phonon coupling in hexagonal YbMnO(3) below its magnetic transition temperature (T(N) ~80 K). This coupling influences phonon modes, with Al substitution further supporting these findings.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spectroscopy
Background:
- Hexagonal YbMnO(3) exhibits complex magnetic and structural properties.
- Understanding spin-phonon coupling is crucial for novel material functionalities.
Purpose of the Study:
- To investigate spin-phonon coupling in hexagonal YbMnO(3) using Raman spectroscopy.
- To identify phonon modes and their temperature-dependent behavior.
Main Methods:
- Preparation of hexagonal YbMnO(3) bulk polycrystals.
- Raman scattering measurements conducted across a temperature range of 15-300 K.
- Analysis of phonon mode frequencies and their anomalies.
Main Results:
- Identification of 15 phonon modes (A(1), E(1), E(2)).
- Anomalous temperature variations in E(2) phonon modes near T(N) ~80 K.
- Softening of an A(1) phonon mode associated with O-Mn vibrations at T(N).
- Evidence of spin-phonon coupling below T(N), supported by Al substitution effects.
Conclusions:
- Raman scattering confirms spin-phonon coupling in hexagonal YbMnO(3) below its magnetic ordering temperature.
- The observed phonon anomalies provide direct evidence of the interaction between magnetic and vibrational degrees of freedom.
- Al substitution on Mn sites influences the spin-phonon coupling, offering avenues for material tuning.
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