Localized vibration and avoided crossing in SrTi<sub>11</sub>O<sub>20</sub> for oxide thermoelectrics with intrinsically low thermal conductivity
Yi Li, Shinya Yamamoto, Kaleem Ahmad, Zeyad Almutairi, Kunihito Koumoto, Chunlei Wan
Abstract
The localized vibration in SrTi<sub>11</sub>O<sub>20</sub> forms low-lying optical phonon bands that distort acoustic phonon branches through the avoided crossing effect. The electrical and thermal transport are decoupled to achieve phonon-glass electron-crystal behaviour.
Topics & Concepts
PhononThermal conductivityCondensed matter physicsMaterials scienceVibrationThermoelectric materialsThermalOxidePhysicsComposite materialAcousticsThermodynamicsMetallurgyAdvanced Thermoelectric Materials and DevicesThermal properties of materialsFerroelectric and Piezoelectric Materials