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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 fluctuations caused by the Jahn-Teller instability in Mn3+ ions coupled with the incipient ferroelectric nature of SrTiO3, as the origin of the low thermal conductivity.

SUBMITTER: Kajimoto R 

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

REPOSITORIES: biostudies-literature

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Elastic and dynamical structural properties of La and Mn-doped SrTiO<sub>3</sub> studied by neutron scattering and their relation with thermal conductivities.

Kajimoto Ryoichi R   Nakamura Mitsutaka M   Murai Naoki N   Shamoto Shin-Ichi SI   Honda Takashi T   Ikeda Kazutaka K   Otomo Toshiya T   Hata Hiroto H   Eto Takahiro T   Noda Masaaki M   Kuwahara Hideki H   Okuda Tetsuji T  

Scientific reports 20180625 1


The electron-doped SrTiO<sub>3</sub> 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 SrTiO<sub>3</sub> 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 SrTiO<sub>3</sub>,  ...[more]

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