Observation of Anomalous Phonons in E-Type Orthorhombic REMnO3
P. Gao, H.Y. Chen, T. A. Tyson, Z. X. Liu, J. M. Bai, L. P. Wang, Y., J. Choi, S.-W. Cheong
TL;DR
This study reports the observation of anomalous phonons in E-type orthorhombic REMnO3, revealing different electric polarization mechanisms compared to incommensurate types, with implications for understanding multiferroic behavior.
Contribution
It provides the first direct observation of anomalous phonons associated with polarization in E-type orthorhombic REMnO3, distinguishing it from incommensurate phases.
Findings
Anomalous phonon appears near the lock-in temperature in E-type REMnO3.
Phonon hardening observed in orthorhombic LuMnO3.
No such phonon changes in incommensurate DyMnO3.
Abstract
We observe the appearance of a phonon near the lock-in temperature in orthorhombic REMnO3 (RE: Lu and Ho) and anomalous phonon hardening in orthorhombic LuMnO3. The anomalous phonon occurs at the onset of spontaneous polarization. No such changes were found in incommensurate orthorhombic DyMnO3. These observations directly reveal different electric polarization mechanisms in the E-type and IC-type REMnO3.
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Taxonomy
TopicsSolid-state spectroscopy and crystallography · Magnetic and transport properties of perovskites and related materials · Multiferroics and related materials