Search Results - "MATSUNAMI, Masaharu"

Discovery of colossal Seebeck effect in metallic Cu2Se by Byeon, Dogyun, Sobota, Robert, Delime-Codrin, Kévin, Choi, Seongho, Hirata, Keisuke, Adachi, Masahiro, Kiyama, Makoto, Matsuura, Takashi, Yamamoto, Yoshiyuki, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…Both electrical conductivity σ and Seebeck coefficient S are functions of carrier concentration being correlated with each other, and the value of power factor…”
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Investigation of Thermoelectric Properties of Ag2SxSe1−x (x = 0.0, 0.2 and 0.4) by Singh, Saurabh, Hirata, Keisuke, Byeon, Dogyun, Matsunaga, Takuya, Muthusamy, Omprakash, Ghodke, Swapnil, Adachi, Masahiro, Yamamoto, Yoshiyuki, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…Materials best-suited for direct application exhibit a high thermoelectric figure of merit ( ZT ) close to unity, from room temperature to ∼ 400 K. In this…”
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Large-Gap Magnetic Topological Heterostructure Formed by Subsurface Incorporation of a Ferromagnetic Layer by Hirahara, Toru, Eremeev, Sergey V, Shirasawa, Tetsuroh, Okuyama, Yuma, Kubo, Takayuki, Nakanishi, Ryosuke, Akiyama, Ryota, Takayama, Akari, Hajiri, Tetsuya, Ideta, Shin-ichiro, Matsunami, Masaharu, Sumida, Kazuki, Miyamoto, Koji, Takagi, Yasumasa, Tanaka, Kiyohisa, Okuda, Taichi, Yokoyama, Toshihiko, Kimura, Shin-ichi, Hasegawa, Shuji, Chulkov, Evgueni V

“…Inducing magnetism into topological insulators is intriguing for utilizing exotic phenomena such as the quantum anomalous Hall effect (QAHE) for technological…”
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High-Performance Solid-State Thermal Diode Consisting of Ag2(S,Se,Te) by Hirata, Keisuke, Matsunaga, Takuya, Singh, Saurabh, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…Thermal diodes, in which the magnitude of the heat flow | J | changes with its direction, are a key technology for constructing heat management systems…”
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A Field Effect Heat Flow Switching Device by Matsunaga, Takuya, Hirata, Keisuke, Singh, Saurabh, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…A heat flow switching device was developed using semiconductors characterized by very small lattice thermal conductivity. We selected Ag2Ch (Ch = S, Se) which…”
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Magneto-thermal conductivity effect and enhanced thermoelectric figure of merit in Ag2Te by Hirata, Keisuke, Kuga, Kentaro, Matsunami, Masaharu, Zhu, Minyue, Heremans, Joseph P., Takeuchi, Tsunehiro

“…In this study, we report a large magneto-thermal conductivity effect, potentially usable in heat flow switches and thermoelectric devices, in Ag2Te over a wide…”
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Development of High-Performance Solid-State Thermal Diodes Using Unusual Behavior of Thermal Conductivity Observed for Ag2Ch (Ch = S, Se, Te) by Hirata, Keisuke, Matsunaga, Takuya, Saurabh, Singh, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…Thermal diodes are a kind of new device which controls the direction and magnitude of heat flow. The performance of thermal diode is evaluated by thermal…”
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Composition, time, temperature, and annealing-process dependences of crystalline and amorphous phases in ductile semiconductors Ag2S1−xTex with x = 0.3–0.6 by Sato, Kosuke, Hirata, Keisuke, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…We investigate composition, time, temperature, and annealing-process dependences of crystalline and amorphous phases in ductile semiconductors Ag2S1−xTex with…”
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Capacitor-type thin-film heat flow switching device by Hirata, Keisuke, Matsunaga, Takuya, Singh, Saurabh, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…We developed a capacitor-type heat flow switching device, in which electron thermal conductivity of the electrodes is actively controlled through the carrier…”
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Dynamical variation of carrier concentration and colossal Seebeck effect in Cu2S low-temperature phase by Byeon, Dogyun, Sobota, Robert, Hirata, Keisuke, Singh, Saurabh, Choi, Seongho, Adachi, Masahiro, Yamamoto, Yoshiyuki, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…To understand the colossal Seebeck effect recently found in metallic Cu2Se at the phase transition from low-to high-temperature phase, we investigated the…”
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Enhancement of the Thermoelectric Performance of Si-Ge Nanocomposites Containing a Small Amount of Au and Optimization of Boron Doping by Muthusamy, Omprakash, Ghodke, Swapnil, Singh, Saurabh, Delime-Codrin, Kévin, Nishino, Shunsuke, Adachi, Masahiro, Yamamoto, Yoshiyuki, Matsunami, Masaharu, Harish, Santhanakrishnan, Shimomura, Masaru, Takeuchi, Tsunehiro

“…In the present work, Si 65- x Ge 31 Au 4 B x ( x  = 1, 2, 3, and 4) nanocomposites were synthesized by ball milling and spark plasma sintering to investigate…”
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Thermoelectric properties of supersaturated Re solid solution of higher manganese silicides by Yamamoto, Akio, Ghodke, Swapnil, Miyazaki, Hidetoshi, Inukai, Manabu, Nishino, Yoichi, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…In this study, we developed a higher manganese silicide (HMS) that possesses a high dimensionless figure of merit ZT exceeding unity. HMSs containing a larger…”
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Valence fluctuation in Yb3Si5 probed by synchrotron X-ray photoemission spectroscopy by Kuga, Kentaro, Matsunami, Masaharu, Fujiwara, Hidenori, Nozue, Goro, Ose, Akane, Sekiyama, Akira, Yasui, Akira, Hamamoto, Satoru, Oura, Masaki, Takeuchi, Tsunehiro

“…We report the direct evidence of valence fluctuation in the thermoelectric material Yb3Si5 by using synchrotron X-ray photoemission spectroscopy. The Yb 3d…”
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Surface Kondo effect and non-trivial metallic state of the Kondo insulator YbB12 by Hagiwara, Kenta, Ohtsubo, Yoshiyuki, Matsunami, Masaharu, Ideta, Shin-ichiro, Tanaka, Kiyohisa, Miyazaki, Hidetoshi, Rault, Julien E., Fèvre, Patrick Le, Bertran, François, Taleb-Ibrahimi, Amina, Yukawa, Ryu, Kobayashi, Masaki, Horiba, Koji, Kumigashira, Hiroshi, Sumida, Kazuki, Okuda, Taichi, Iga, Fumitoshi, Kimura, Shin-ichi

“…A synergistic effect between strong electron correlation and spin–orbit interaction has been theoretically predicted to realize new topological states of…”
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Direct observation of pseudo-gap electronic structure in the Heusler-type Fe2VAl thin film by Miyazaki, Hidetoshi, Tateishi, Shogo, Matsunami, Masaharu, Soda, Kazuo, Yamada, Shinya, Hamaya, Kohei, Nishino, Yoichi

“…•The electronic structure of a Heusler-type Fe2VAl thin film was studied by HAXPES.•The Fe2VAl thin film showed a semi-metallic pseudo-gap electronic…”
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Long-Term Stability of the Colossal Seebeck Effect in Metallic Cu2Se by Byeon, Dogyun, Sobota, Robert, Singh, Saurabh, Ghodke, Swapnil, Choi, Seongho, Kubo, Naoto, Adachi, Masahiro, Yamamoto, Yoshiyuki, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…Determination of thermoelectric properties is rather a challenging task, especially during a phase transition, where a drastic change in magnitude of…”
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Improvement of thermoelectric performance of flexible compound Ag2S0.55Se0.45 by means of partial V-substitution for Ag by Sato, Kosuke, Singh, Saurabh, Yamazaki, Itsuki, Hirata, Keisuke, Ang, Artoni Kevin R., Matsunami, Masaharu, Takeuchi, Tsunehiro

“…The effects of the partial V-substitution for Ag on the thermoelectric (TE) properties are investigated for a flexible semiconducting compound Ag2S0.55Se0.45…”
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Effective Decrease of the Thermal Conductivity Caused by Hf in Fe(V0.955−xHf0.045Tix)Sb Half-Heusler Phase by Delime-Codrin, Kévin, Swapnil, Ghodke, Byeon, Dogyun, Sobota, Robert, Matsunami, Masaharu, Takeuchi, Tsunehiro

“…The thermoelectric properties of the Fe(V0.955−xHf0.045Tix)Sb half-Heusler (HH) phase were studied in the temperature range from 300 to 800 K. We employed Hf-…”
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First Observation of Heavy Fermion Behavior in Ce-Based Icosahedral Approximant by Imura, Keiichiro, Nobe, Kohei, Deguchi, Kazuhiko, Matsunami, Masaharu, Miyazaki, Hidetoshi, Yasui, Akira, Ikenaga, Eiji, Sato, Noriaki K.

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Observation of Thickness-Dependent Exchange Interaction in EuO Ultrathin Films by Miyazaki, Hidetoshi, Hajiri, Tetsuya, Matsunami, Masaharu, Inukai, Manabu, Ito, Takahiro, Kimura, Shin-ichi

“…The electronic structure of single-crystalline EuO (100) ultrathin films, together with their exchange splitting energy ( ΔE EX ) and ferromagnetic phase…”
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