Thermoelectric Properties of Electron-Doped SrMnO3 Single Crystals with Perovskite Structure
- 488 Downloads
Thermoelectric properties have been investigated for single crystals of Sr(Mn1−x Mo x )O3 with the perovskite structure. Similar to (Sr1−x Ce x )MnO3, the Seebeck coefficient for lightly electron-doped compounds (x ≤ 0.01) is enhanced upon G-type antiferromagnetic ordering, while maintaining metallic conduction. This results in enhancement of the figure of merit (ZT). On the other hand, the Seebeck coefficient for the more electron-doped compound (x = 0.025) changes sign from negative to positive within a spin and orbital ordered phase (with C-type antiferromagnetic configuration and Mn 3z 2 − r 2 type orbital order) as the temperature is lowered, whereas the Hall coefficient remains negative in the whole temperature range. The enhancement of the ZT value in the G-type antiferromagnetic phase implies the possibility for improvement of the thermoelectric efficiency by using the coupling between charge, spin, orbital, and lattice degrees of freedom in strongly correlated electron systems.
KeywordsPerovskite manganite thermoelectric properties magnetic and orbital ordering single crystals
Unable to display preview. Download preview PDF.