Tsutomu Kanno

Colossal electroresistance of a Pr 0.7 Ca 0.3 Mn O 3 thin film at room temperature

The electronic conduction through a

Isotropic Conduction Network and Defect Chemistry in Mg3+δSb2‐Based Layered Zintl Compounds with High Thermoelectric Performance

{\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}

Anisotropic thermoelectric properties in layered cobaltite AxCoO2 (A=Sr and Ca) thin films

thin film is investigated by measurements using dc and pulsed biases. Semiconducting

Enhancement of transverse thermoelectric power factor in tilted Bi/Cu multilayer

{\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}

Control of Epitaxial Growth Orientation and Anisotropic Thermoelectric Properties of Misfit-Type Ca3Co4O9 Thin Films

films sandwiched by electrodes show both hysteretic and asymmetric behaviors in current-voltage characteristics. The observed conduction characteristics exhibit the space-charge-limited-current effect, and the hysteretic behavior can be ascribed to a carrier trapping and detrapping of the trap sites in the manganite. The hysteresis induces a colossal electroresistance (CER) of more than 5000% at room temperature. The CER ratio is independent of the duration time of pulses from an infinite (dc) down to

Tailoring effective thermoelectric tensors and high-density power generation in a tubular Bi0.5Sb1.5Te3/Ni composite with cylindrical anisotropy

150\phantom{\rule{0.3em}{0ex}}\mathrm{ns}

Gigantic transverse voltage induced via off-diagonal thermoelectric effect in CaxCoO2 thin films

, indicating that the carrier filling of all the traps can be completed within a short time.

Transient response during resistance switching in Ag∕Pr0.7Ca0.3MnO3∕Pt thin films

Thermoelectric performance in the layered Zintl phase n-type Mg3+δ (Sb,Bi)2 is reported. Insertion of the excess Mg into the compounds is crucial for realizing n-type carrier transport with multivalley and isotropic character. An excellent ZT of 1.51 ± 0.06 at 716 K is achieved in the sintered polycrystals at the composition of Mg3.2 Sb1.5 Bi0.49 Te0.01 .

Bifunctional thermoelectric tube made of tilted multilayer material as an alternative to standard heat exchangers

We have fabricated epitaxial thin films of layered cobaltite AxCoO2 (A=Sr and Ca) on sapphire substrates by rf magnetron sputtering. The grown phase in the AxCoO2 films was found to be a monoclinic β-phase of primitive layered cobaltites and the epitaxial orientation of the film could be controlled by the surface plane of the substrates. The resistivity parallel to the CoO2 layers ρ‖ for the β-SrxCoO2 is as low as 2mΩcm at room temperature and shows metallic behavior. The ratio of perpendicular resistivity ρ⊥ to ρ‖ increases from 20 at room temperature to 90 at 3K. More isotropic nature was observed in the Seebeck coefficient. Parallel Seebeck coefficients S‖ of AxCoO2 are approximately 60μV∕K at room temperature and the perpendicular S⊥ are about half of S‖.

Tailoring of inclined crystal orientation in layered cobaltite thin films for the development of off-diagonal thermoelectric effect

We investigated transverse thermoelectric response in tilted Bi/Cu multilayer. Estimation through an equivalent circuit model showed that transverse thermoelectric power factor (PF) reaching 155 μW/cm K2 is possible with optimum device parameters. Finite element analysis confirmed the validity of the estimation using tensorial representation, which implicitly assumes homogeneous anisotropy. The Bi/Cu multilayer was fabricated by pressure injection of molten Bi into a periodically slitted Cu block. The measurement of the fabricated sample verified an enhancement in transverse PF up to 50.1 μW/cm K2, which is approximately 1.5 times greater than the conventional PF of constituent Bi, 34 μW/cm K2.