Influence of ferromagnetic ordering on Raman scattering in CoS2
Abstract
The effects of phonon anharmonicity, phonon-magnon, and electron-phonon interactions on the temperature dependence of Raman optical phonon modes are theoretically investigated. Besides the Klemens result for the phonon width due to anharmonicity, the corresponding line shift is derived. We argue that the phonon decay into two magnons has very low intensity in ferromagnets with low Curie temperatures. Therefore, the electron interband transitions accompanied with the ferromagnetic ordering are included in considerations to get a good quantitative agreement with experiments.
- Publication:
-
Physical Review B
- Pub Date:
- October 2013
- DOI:
- 10.1103/PhysRevB.88.155135
- arXiv:
- arXiv:1308.3571
- Bibcode:
- 2013PhRvB..88o5135F
- Keywords:
-
- 42.50.Nn;
- 63.20.-e;
- 75.30.Ds;
- 78.30.-j;
- Quantum optical phenomena in absorbing dispersive and conducting media;
- Phonons in crystal lattices;
- Spin waves;
- Infrared and Raman spectra;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 6 pages, 6 figures