Journal
PHYSICAL REVIEW B
Volume 102, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.054418
Keywords
-
Funding
- Ministry of Science and Higher Education of the Russian Federation [AAAA-A18-118020190098-5]
- Russian Foundation for Basic Research [19-52-18008]
Ask authors/readers for more resources
We report a Raman scattering study of YFeO3 orthoferrite. Polarized Raman measurements in wide temperature range and first-principles calculations provided the assignment of the observed phonon modes to vibrational symmetries and atomic displacements. We did not observe previously reported anomalies in the behavior of phonon frequencies near the temperature of the antiferromagnetic transition. Temperature behavior of frequencies and linewidths of most phonons may be described by known expressions for cubic and quartic anharmonicity, which implies a significant contribution of phonon-phonon interaction. At the same time, several phonons exhibit asymmetric profiles and anomalies in the behavior of their widths, which indicates an interaction with a continuum of some excitations. The most striking evidence of this is the observation of the coupling of the B-2g phonon at 640 cm(-1) with the two-magnon continuum, expressed in anomalous phonon self-energies in the vicinity of T-N. The appearance of a broad continuum of low-frequency excitations when approaching T-N, which is possibly induced by the damping of spin excitations due to interaction with the lattice, has been revealed. This interaction can lead to additional contributions to the renormalization of phonon self-energies, formally described by formulas for anharmonic effects. Phonon scattering induced by defects has been identified. The temperature behavior of resonant second-order phonon and two-magnon scattering was studied in detail.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available