Abstract
The temperature () dependence of the optical conductivity spectra of a single crystal thin film is studied over a range from 5 to 450 K. We observed significant dependence of the spectral weights of the charge transfer and interband transitions across the ferromagnetic Curie temperature (). Such dependence was attributed to the increase in the Ru spin moment, which is consistent with the results of density functional theory calculations. scans of at fixed frequencies reveal a clear dependence below , demonstrating that the Stoner mechanism is involved in the evolution of the electronic structure. In addition, continues to evolve at temperatures above , indicating that the local spin moment persists in the paramagnetic state. This suggests that is an intriguing oxide system with itinerant ferromagnetism.
- Received 11 March 2013
DOI:https://doi.org/10.1103/PhysRevLett.110.247202
© 2013 American Physical Society