Elastic and dynamical structural properties of La and Mn-doped SrTiO₃ studied by neutron scattering and their relation with thermal conductivities.

ABSTRACT: The electron-doped SrTiO₃ exhibits good thermoelectric properties, which makes this material a promising candidate of an n-type oxide thermoelectric device. Recent studies indicated that only a few percent co-doping of La and Mn in SrTiO₃ substantially reduces the thermal conductivity, thereby greatly improving the thermoelectric figure of merit at room temperature. Our time-of-flight neutron scattering studies revealed that by doping both La and Mn into SrTiO₃, the inelastic scattering spectrum shows a momentum-independent increase in the low-energy spectral weight approximately below 10 meV. The increase in the low-energy spectral weight exhibits a clear correlation with thermal conductivity. The correlation is attributed to dynamical and local structural

SUBMITTER: Kajimoto R 

PROVIDER: S-EPMC6018226 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature