Phonon decay in BaSnO3 perovskite

Abstract

Time-domain coherent Raman techniques have been utilized to selectively measure ultrafast decay rates of optical phonons in cubic BaSnO3 perovskite. Measurements were made within a 350–1300 [Formula: see text] frequency range with time and equivalent spectral resolution of ∼120 fs and less than 0.1 [Formula: see text], respectively. The phonon mode damping rates are found to be within 1.27–1.59 [Formula: see text] at room temperature, indicating that the homogeneously broadened Raman linewidths are within 6.7–8.4 [Formula: see text]. Phonon decay mechanisms are being discussed within the framework of parametric phonon interactions due to lattice anharmonicity. Characteristics of the Raman active modes are essential in understanding the limiting factors for achieving high carrier mobility in device applications of the material.