| Project/Area Number |
16H05983
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thin film/Surface and interfacial physical properties
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| Research Institution | Tohoku University (2018)
Tokyo Institute of Technology (2016-2017) |
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Principal Investigator |
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| Research Collaborator |
OHTOMO Akira
OSHIMA Takayoshi
SAKATA Osami
KUMIGAHIRA Hiroshi
HORIBA Koji
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥25,740,000 (Direct Cost: ¥19,800,000、Indirect Cost: ¥5,940,000)
Fiscal Year 2018: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2017: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2016: ¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
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| Keywords | 酸化物薄膜 / 酸化チタン / 超伝導 / 金属絶縁体転移 / パルスレーザ堆積法 |
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| Outline of Final Research Achievements |
In this research, I focused on reduced simple titanates with their chemical formula of TiOx (x < 2). I grew their titanate films by using pulsed-laser deposition and investigated their electric properties. I succeeded in growth of Ti2O3, gamma-type Ti3O5, and Ti4O7 films. As for Ti2O3 films, I revealed that stable insulating phase and large anisotropy in conductivity due to thin film form. As for gamma-type Ti3O5 and Ti4O7, superconductivity appeared with their transition temperatures of 7.1 K and 3.0 K, respectively.
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| Academic Significance and Societal Importance of the Research Achievements |
酸化チタン系材料では、二酸化チタン（TiO2)が光触媒や顔料に応用されている。本研究は酸化チタン材料のさらなる応用目指し、電子物性に着目して研究を進めた。その結果、Ti2O3の半導体的特性やTi3O5, Ti4O7の超伝導特性を明らかにした。絶縁体的特性を持つTiO2や金属Tiを含めると、酸化チタン系材料で絶縁体-半導体-金属-超伝導のすべての電子物性が発現することを見出した。すなわち、本研究により安全で安価な酸化チタン材料を用いた「酸化チタンエレクトロニクス」実現の可能性が示された。
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