Effects of Mn substitution on the thermoelectric properties of the electron-doped perovskite SrLaTiO

Okuda, Tetsuji*; Hata, Hiroto*; Eto, Takahiro*; Nishina, Kosuke*; Kuwahara, Hideki*; Nakamura, Mitsutaka   ; Kajimoto, Ryoichi  

We have tried to improve the n-type thermoelectric properties of the electron-doped Perovskite SrLaTiO by a Mn substitution. The 1-2% Mn substitution enhances the Seebeck coefficient () and reduces the thermal conductivity () by about 50% at room temperature (RT) without largely increasing the resistivity for the 5% electron-doped SrTiO. Consequently, the power factor at RT keeps a large value comparable to that of BiTe and the dimensionless figure-of-merits at RT increases twofold by the slight Mn substitution. Such a large reduction of at RT is perhaps due to the effect of Jahn-Teller active Mn ions, around which dynamical local lattice distortion may occur.