Complex structures and electronic phases in simple-oxide thin films
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 |
Research Field |
Thin film/Surface and interfacial physical properties
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Research Institution | Tohoku University (2018) Tokyo Institute of Technology (2016-2017) |
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 |
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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Report
(4 results)
Research Products
(28 results)
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[Journal Article] Anisotropic Charge Distribution Induced by Spin Polarization in La0.6Sr0.4MnO3 Thin Films Studied by X-ray Magnetic Linear Dichroism2018
Author(s)
G. Shibata, K. Yoshimatsu, K. Ishigami, T. Harano, Y. Takahashi, S. Sakamoto, Y. Nonaka, T. Kadono, M. Furuse, S. Fuchino, M. Okano, J. Fujihira, A. Uchida, K. Watanabe, H. Fujihira, S. Fujihira, A. Tanaka, H. Kumigashira, T. Koide, and A. Fujimori
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Journal Title
Journal of the Physical Society of Japan
Volume: 87
Issue: 11
Pages: 114713-114713
DOI
NAID
Related Report
Peer Reviewed
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[Journal Article] Anisotropic spin-density distribution and magnetic anisotropy of strained La1-xSrxMnO3 thin films: Angle-dependent x-ray magnetic circular dichroism2018
Author(s)
G. Shibata, M. Kitamura, M. Minohara, K. Yoshimatsu, T. Kadono, K. Ishigami, T. Harano, Y. Takahashi, S. Sakamoto, Y. Nonaka, K. Ikeda, Z. Chi, M. Furuse, S. Fuchino, M. Okano, J. Fujihira, A. Uchida, K. Watanabe, H. Fujihira, S. Fujihira, A. Tanaka, H. Kumigashira, T. Koide, and A. Fujimori
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Journal Title
npj Quantum Materials
Volume: VOL. 3
Issue: 1
Pages: 3-3
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Epitaxial growth and electric properties of γ-Al2O3 (110) films on β-Ga2O3 (010) substrates2016
Author(s)
M. Hattori, T. Oshima, R. Wakabayashi, K. Yoshimatsu, K. Sasaki, T. Masui, A. Kuramata, S. Yamakoshi, K. Horiba, H. Kumigashira, A. Ohtomo
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Journal Title
Japanese Journal of Applied Physics
Volume: 55
Issue: 12
Pages: 1202B6-1202B6
DOI
NAID
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Photon-dressed two-dimensional carriers on the ZnO surface2016
Author(s)
R. Yukawa, K. Ozawa, S. Yamamoto, H. Iwasawa, K. Shimada, E. F. Schwier, K. Yoshimatsu, H. Kumigashira, H. Namatame, M. Taniguchi, and I. Matsuda
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Journal Title
Phys. Rev. B
Volume: 94
Issue: 16
DOI
Related Report
Peer Reviewed
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