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Ti
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NiSe
Tsuchida, Shun*; Hirose, Yusuke; Sekikawa, Takuya; Ono, Yoshiaki*; Hirahara, Takuya*; Sano, Sumika*; Kawaguchi, Shogo*; Kobayashi, Shintaro*; Uwatoko, Yoshiya*; Settai, Rikio*
Journal of the Physical Society of Japan, 94(11), p.114703_1 - 114703_7, 2025/10
Times Cited Count：2 Percentile：51.84(Physics, Multidisciplinary)We investigated the carrier doping effect on an excitonic insulator TaNiSe by means of the electrical resistivity 
and Hall coefficient 
using single crystals of (TaTi)NiSe, and band calculation. The excitonic transition temperature 
is continuously suppressed to 83 K at 
= 0.104 while preserving the crystal structure. With increasing substitution concentration , a semiconducting increment of and is strongly suppressed and a metallic behavior is observed at > 0.06. Ti substitution can realize an excitonic correlated metallic state. This metallization is explained by the hole doping effect based on the band calculations. Applying pressure to the carrier doped (TaTi)NiSe, we found superconductivity above 2.6 GPa, which is much smaller than that of TaNiSe around 8 GPa. The carrier doping induced by Ti substitution favors superconductivity in this compound.
Yamamoto, Hajime*; Ikeda, Osamu*; Honda, Takashi*; Kimura, Kenta*; Aoyama, Takuya*; Ogushi, Kenya*; Suzuki, Akio*; Ishii, Kenji*; Matsumura, Daiju; Tsuji, Takuya; et al.
Physical Review Materials (Internet), 8(9), p.094402_1 - 094402_6, 2024/09
Times Cited Count：6 Percentile：36.50(Materials Science, Multidisciplinary)
M
O
cathode materials for aqueous photo-rechargeable batteriesShimokawa, Kohei*; Matsubara, Shogo*; Kawaguchi, Tomoya*; Okamoto, Akihiro*; Ichitsubo, Tetsu
Chemical Communications, 59(51), p.7947 - 7950, 2023/06
Times Cited Count：2 Percentile：9.80(Chemistry, Multidisciplinary)Ishii, Yui*; Yamamoto, Arisa*; Sato, Naoki*; Nambu, Yusuke*; Kawamura, Seiko; Murai, Naoki; Ohara, Koji*; Kawaguchi, Shogo*; Mori, Takao*; Mori, Shigeo*
Physical Review B, 106(13), p.134111_1 - 134111_7, 2022/10
Times Cited Count：2 Percentile：9.54(Materials Science, Multidisciplinary)SbO
F observed by high-resolution synchrotron and neutron diffractionShimono, Seiya*; Ishibashi, Hiroki*; Nagayoshi, Yusuke*; Ikeno, Hidekazu*; Kawaguchi, Shogo*; Hagihara, Masato; Torii, Shuki*; Kamiyama, Takashi*; Ichihashi, Katsuya*; Nishihara, Sadafumi*; et al.
Journal of Physics and Chemistry of Solids, 163, p.110568_1 - 110568_7, 2022/04
Times Cited Count：2 Percentile：8.81(Chemistry, Multidisciplinary)Kanda, Reiko*; Homma, Toshimitsu*; Takahara, Shogo; Tsubokura, Masaharu*; Osako, Masahiro*; Kawaguchi, Isao*; Kato, Takaaki*
Risukugaku Kenkyu, 30(3), p.133 - 139, 2021/04
Almost ten years have passed since Fukushima nuclear accident. Our experience should be used to improve current emergency protective measures and preparedness. A review of the protective measures implemented in the aftermath of Fukushima nuclear accident has revealed problems such as paternalistic intervention for inhabitants and increased health risks due to the evacuation of vulnerable groups. The risk trade-offs in environmental recovery actions are more complex and ongoing; the stakeholders are the next generation and residents outside of the prefecture. Since one of the characteristics of nuclear disasters is the distance and time dependency of the risk, countless individual cases need to be addressed. While generalization of protective measures is essential, the appropriate deployment of personnel in a variety of roles may require to really address individual cases. To improve nuclear emergency preparedness in the future, it is necessary to incorporate both a top-down approach and a bottom-up approach in a well-balanced manner.
Li, B.*; Kawakita, Yukinobu; Kawamura, Seiko; Sugahara, Takeshi*; Wang, H.*; Wang, J.*; Chen, Y.*; Kawaguchi, Saori*; Kawaguchi, Shogo*; Ohara, Koji*; et al.
Nature, 567(7749), p.506 - 510, 2019/03
Times Cited Count：428 Percentile：99.68(Multidisciplinary Sciences)Refrigeration is of vital importance for modern society for example, for food storage and air conditioning- and 25 to 30% of the world's electricity is consumed for refrigeration. Current refrigeration technology mostly involves the conventional vapour compression cycle, but the materials used in this technology are of growing environmental concern because of their large global warming potential. As a promising alternative, refrigeration technologies based on solid-state caloric effects have been attracting attention in recent decades. However, their application is restricted by the limited performance of current caloric materials, owing to small isothermal entropy changes and large driving magnetic fields. Here we report colossal barocaloric effects (CBCEs) (barocaloric effects are cooling effects of pressure-induced phase transitions) in a class of disordered solids called plastic crystals. The obtained entropy changes in a representative plastic crystal, neopentylglycol, are about 389 joules per kilogram per kelvin near room temperature. Pressure-dependent neutron scattering measurements reveal that CBCEs in plastic crystals can be attributed to the combination of extensive molecular orientational disorder, giant compressibility and highly anharmonic lattice dynamics of these materials. Our study establishes the microscopic mechanism of CBCEs in plastic crystals and paves the way to next-generation solid-state refrigeration technologies.
Yoshida, Hiroko*; Nomura, Naoki*; Kono, Takahiko; Sakoda, Akihiro; Kuroda, Yujiro*; Naito, Wataru*; Hirota, Seiko*; Kudo, Shinichi*; Kawaguchi, Isao*; Etani, Reo*; et al.
no journal, ,
The WG has translated the "Practical Guidance for Engagement with the Public on Radiation and Risk" ("IRPA Guidance") issued by the International Radiation Protection Association ("IRPA") to its member societies in 2020. "The content of the IRPA guidance was presented at a symposium organized by the Health Physics Society of Japan in June 2020. The content of the IRPA guidance was presented at the Health Physics Society planning symposium held in June 2020, where many experts attended and provided feedback. In this planning session, we will focus on public engagement and related specific examples and situations related to public engagement.
Yoshida, Hiroko*; Nomura, Naoki*; Kono, Takahiko; Sakoda, Akihiro; Kuroda, Yujiro*; Naito, Wataru*; Hirota, Seiko*; Kudo, Shinichi*; Takahara, Shogo; Etani, Reo*; et al.
no journal, ,
The WG has translated the "Practical Guidance for Engagement with the Public on Radiation and Risk" ("IRPA Guidance") issued by the International Radiation Protection Association ("IRPA") to its member societies in 2020. "Practical Guidance for Engagement with the Public on Radiation and Risk" (hereinafter referred to as "IRPA Guidance") published by the International Radiological Protection Association (hereinafter referred to as "IRPA") in 2020 for its member societies, and to provide the information to radiation protection experts and other interested.
FInaguma, Yoshiyuki*; Katsumata, Tetsuhiro*; Takami, Takuya*; Mimura, Kazunori*; Kobayashi, Shintaro*; Kawaguchi, Shogo*; Yoneda, Yasuhiro
no journal, ,
While most of the reported Perovskite-type complex anionic acid fluorides have a cubic crystal structure, AgTiOF has a tetragonal structure and the anion octahedron is tilted in anti-phase. In order to clarify why these differences arise, we investigated the average structure, local structure, polarity, and their interrelationships, and clarified the origin of the polarity. Optical second harmonic (SHG) measurements were performed, and the SHG signal was observed at room temperature, suggesting the possibility of polarity. In addition, the corresponding phase transition was observed by high-temperature X-ray diffraction measurements. From these results, it is necessary to analyze the local structure using a structural model with microscopic polarization.
NiSe
using X-ray diffractionHirose, Yusuke; Tsuchida, Shun*; Sano, Sumika*; Kawaguchi, Shogo*; Kobayashi, Shintaro*; Omura, Ayako*; Settai, Rikio*
no journal, ,
TaNiSe undergoes a structural phase transition from orthorhombic to monoclinic at Tc~330K and simultaneously becomes an insulator, which attracts attention as one of candidate materials for exciton insulators, and has been actively studied. We have previously demonstrated that element substitution can suppress Tc and cause the system to become metallic. In this study, we aimed to clarify the origin of the change in electronic state due to element substitution by crystal structure analysis, and we performed powder X-ray diffraction experiments on element-substituted TaNiSe at BL02 of SPring-8, and we will report the results.
Satone, Hiroshi*; Segawa, Tomoomi; Kawaguchi, Koichi; Taguchi, Shogo*; Yamamoto, Takuji*; Iimura, Kenji*
no journal, ,
Nanoparticle coating is a very effective method for preventing dust adhesion and is expected to be used in the various applications. However, nanoparticle coatings have been applied to inorganic materials such as glass and metals, and there have been no successful cases on resin substrate surfaces. In this study, silica nanoparticles were successfully coated by pre-adsorbed cationic polyelectrolytes on the resin substrate surface.
Sasaki, Michiya*; Takagi, Shunji*; Kai, Michiaki*; Furukawa, Kyoji*; Kawaguchi, Isao*; Kudo, Shinichi*; Takahara, Shogo; Otoshi, Kazuki*; Shimada, Kazumasa; Satoh, Daiki
no journal, ,
To contribute to the quantitative discussion of risks associated with low-dose radiation exposure, the Japan Society of Health Physics established the "Task Group for the Development of Estimation Codes for Cancer Risk caused by Radiation Exposure". This presentation will report on the activities conducted during the two-year period from FY2020 to FY2021.
