Thermal properties of La0.7Ca0.2Sr0.1MnO3:PdO composites.

Abstract A systematic study on the thermal conductivity, Seebeck coefficient and specific heat of La 0.7 Ca 0.2 Sr 0.1 MnO 3 :PdO composites is presented. Solid state reaction procedure was employed to synthesis the samples. It is seen from thermal conductivity (κ(T)) studies that the samples exhibit a slope change nature close to their corresponding magnetic phase transition temperature, T C. The overall magnitude of κ is observed to decrease with increasing Pd concentration. The analysis of Seebeck coefficient data, S(T) versus temperature, T was done using Mott's polaron hopping model reveals that the electron-magnon scattering is governing the low temperature region. The temperature dependent specific heat C P (T) is analyzed to determine the entropy change (Δ S) during the magnetic phase transition. Highlights • Thermal conductivity deceases with increase in Pd content. • Mott's polaron hopping mechanism is operative at high temperatures. • Change in entropy ΔS decreases with Pd content. [ABSTRACT FROM AUTHOR]