Abstract
Optical pump-probe measurements of transient reflectivity were made on a sputtered polycrystalline thin film of hcp Zr. On top of a slow multiexponential decay, an oscillatory signal was observed with frequency varying from the initial value of at zero time delay to a value of after , which is similar to that of a transverse optical (TO) phonon near the point of the Brillouin zone. From the data, the TO phonon relaxation time was determined to be . The excitation of the coherent phonon was identified as being mediated by resonant coherent Raman scattering.
- Received 2 March 2007
DOI:https://doi.org/10.1103/PhysRevB.76.012301
©2007 American Physical Society