OICC Press Journal of Theoretical and Applied Physics 2251-7235 6 1 2023 11 17 Thermoelectric power of metallic Rb3C60: phonon-drag and carrier diffusion contributions 10.1186/2251-7235-6-37 EN Dinesh Varshney Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University Namita Singh Department of Physics, Ranchi College, Ranchi University Ranchi Journal Article 2023 11 17 AbstractThermoelectric power (S) of Rb3C60 fullerides in the metallic phase is theoretically estimated. We first develop a Hamiltonian model that incorporates the scattering rates within the relaxation time approximation to estimate the phonon-drag thermoelectric power (Sphdrag) incorporating the scattering of phonons with defects, electrons as carriers, grain boundaries, and phonon-phonon interactions. As a next step, Mott expression within parabolic band approximation is used to analyze the electron diffusive thermoelectric power (Scdiff) using Fermi energy as electron parameter, and Scdiff shows a linear temperature dependence. The Sphdrag is nonzero in both normal and superconducting states. Its behavior is determined by competition among the several operating scattering rates for heat carriers and a balance between diffusive carrier and phonon-drag contributions. Acoustic phonons are effectively scattered by various scatterers for the thermoelectric power. S infers a change in slope above transition temperature and becomes almost linear above 70 K.