Developement of nonvolatile memory devices utilizing charge-glass and charge-crystal states realized in strongly correlated pi-electron systems
| Project/Area Number |
18H01853
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 29010:Applied physical properties-related
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| Research Institution | The University of Tokyo (2019-2020)
Tohoku University (2018) |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2020: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
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| Keywords | 電荷ガラス / 幾何学的フラストレーション / 電荷秩序 / 有機導体 / 三角格子 / TTT図 / 強相関電子 / DSC / 強相関 / 示差走査熱量測定 / 量子ガラス / 有機薄膜単結晶 / 分子性有機導体 / 不揮発性メモリ |
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| Outline of Final Research Achievements |
In this study, we performed optical conductivity and electrical resistivity measurements on θ-(BEDT-TTF)2MZn(SCN)4 (M = Rb), in which defects were artificially introduced by X-ray irradiation. We obtained the temperature-time-transformation (TTT) diagram, which shows that the defects in the sample prevent charge crystallization, while they promote charge vitrification. We also performed resistance noise measurements in θ-(BEDT-TTF)2MZn(SCN)4 (M = Cs, Rb, Tl) and found a correlation between charge glass formation and structural glasses. These results provide important information for the realization of memory materials based on the charge glass and crystal states.
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| Academic Significance and Societal Importance of the Research Achievements |
近年、高速・大容量通信技術の著しい発展に伴い、磁気ディスク・フラッシュメモリを刷新するより高速な不揮発性記録デバイスが必要とされており、新規なメモリ機能の開拓は現代応用物理学に課せられた重要な使命となっている。本研究は、二次元三角格子構造をもつ強相関有機導体で実現する電子の結晶化とガラス化を利用した不揮発性メモリの原理を確立することを目指したものであり、結晶中の乱れが電荷の結晶化を阻害し、電荷のガラス化を促進するという研究結果は、電荷ガラス・電荷結晶を利用した新規メモリ材料の実現に向けた大きな指針になると考えられる。
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Report
(4 results)
Research Products
(39 results)
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[Journal Article] High-Pressure Phase Diagrams of FeSe1-xTex: Correlation between Suppressed Nematicity and Enhanced Superconductivity2021
Author(s)
K. Mukasa, K. Matsuura, M. Qiu, M. Saito, Y. Sugimura, K. Ishida, M. Otani, Y. Onishi, Y. Mizukami, K. Hashimoto, J. Gouchi, R. Kumai, Y. Uwatoko, and T. Shibauchi
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Journal Title
Nat. Commun.
Volume: 12
Issue: 1
Pages: 381-381
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] 水素結合型モット絶縁体Cat-EDT系における量子常誘電・常磁性状態2019
Author(s)
藤井桜子, 下澤雅明, 近藤潤, 杉井かおり, 山下穣, 上田顕, 森初果, 杉浦栞理, , 寺嶋太一, 宇治進也, 橋本顕一郎, 井口敏, 佐々木孝 彦
Organizer
日本物理学会第74回年次大会
Related Report
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[Presentation] Crystallization and vitrification of strongly correlated electrons on a geometrically frustrated triangular lattice2018
Author(s)
Kenichiro Hashimoto , Satoru Sasaki , Ryota Kobayashi , Keisuke Itoh , Satoshi Iguchi , Yutaka Nishio , Yuka Ikemoto , Taro Moriwaki , Naoki Yoneyama , Masashi Watanabe , Akira Ueda , Hatsumi Mori , Kensuke Kobayashi , Reiji Kumai , Youichi Murakami , Jens Mueller , Takahiko Sasaki
Organizer
APS March Meeting 2018
Related Report
Int'l Joint Research
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