Low Temperature Specific Heat in Lightly Mn-Substituted Electron-Doped SrTiO<sub>3</sub>

Okuda, Takashi; Hata, Hiroto; Eto, Takahiro; Sobaru, Shogo; Oda, Ryosuke; Noda, Minoru; Kuwahara, H.

doi:10.7566/jpsj.86.084601

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…We found all the compounds exhibit similar values of specific heats at high temperatures (see Supplementary Fig. S1) although doping dependence was reported at low temperatures below 100 K 7,17 . This result indicates that the large reduction of κ in SLTMO2 and SLTMO4 is not caused by the change in C and instead is caused by the decrease in l or v g .…”

Section: Resultssupporting

confidence: 51%

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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

Kajimoto

Nakamura

Murai

et al. 2018

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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.

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Section: Resultssupporting

confidence: 51%

“…The Jahn-Teller scenario requires creation of Mn 3+ ions, and this was confirmed by the lattice parameters 6,7 and specific heat 17 . The creation of Mn 3+ ions is also supported by the present inelastic neutron scattering spectra at high energies as explained below.…”

Section: Resultsmentioning

confidence: 79%

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

Kajimoto

Nakamura

Murai

et al. 2018

Sci Rep

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Schottky specific heat of the lightly Mn-substituted electron-doped SrTiO3

et al. 2018

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Large changes in the low-temperature specific heat (low-T C) by applying magnetic fields up to 9 Tesla were found in the lightly Mn-substituted electron-doped perovskites Sr1−xLaxTiO3. The changes in the low-T C are qualitatively well explained by the Schottky specific heat (CSch) of localized spins of the Mn 3d electrons in weak internal magnetic fields via itinerant electrons. According to the analysis by using the conventional model, the doped Mn ions are apparently not Mn4+ (S = 3/2) ions, but are Jahn-Teller active Mn3+ (S = 2) ions or mixtures of Mn3+ and Mn2+ ions. However, the actual numbers of localized spins estimated from CSch are about 30% smaller than the expected values. Part of the localized spins of the Mn 3d electrons may disappear due to Kondo coupling with the itinerant electrons, leading to the observed enhancement of the electronic specific heat coefficients.

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Low Temperature Specific Heat in Lightly Mn-Substituted Electron-Doped SrTiO₃

Cited by 2 publications

References 15 publications

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

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

Schottky specific heat of the lightly Mn-substituted electron-doped SrTiO3

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Low Temperature Specific Heat in Lightly Mn-Substituted Electron-Doped SrTiO3

Cited by 2 publications

References 15 publications

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

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

Schottky specific heat of the lightly Mn-substituted electron-doped SrTiO3

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Low Temperature Specific Heat in Lightly Mn-Substituted Electron-Doped SrTiO₃