| Project/Area Number |
18K03521
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | Kagoshima University |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 光イメージング / 複屈折 / 磁性体 / 誘電体 / イメージング技術 / 旋光性 / 偏光解析技術 / 顕微観察 / マルチフェロイクス |
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| Outline of Final Research Achievements |
Using optical imaging measurement techniques, spatial distributions of magnetic and dielectric states were observed. In antiferromagnet KNiF3, several optical domains appear when external force was applied, and their shapes change below the antiferromagnetic phase transition temperature. In quantum paraelectric SrTiO3, stress-induced ferroelectric phase transition was observed by applying external force. When external force was applied along [001], slip planes appeared along [-11-1] and [1-11]. When the temperature further decreased below 20 K, almost the uniform ferroelectric state appeared. On the other hand, when external forces were applied along [1-10], many slip planes were generated, and strain concentration also appeared around the dislocations, but the ferroelectric phase transition did not occur.
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| Academic Significance and Societal Importance of the Research Achievements |
一般に弾性体に対して外から力を印可すると、試料内では応力や歪みに分布が現れることが知られている。磁性体や誘電体に外から力を印可した実験も数多く報告されている。しかし試料内で発生する局所的な歪みが磁性や誘電性にどのような影響を及ぼすか、それらを観察出来る手段がこれまでなかった。本研究では光イメージング技術を用いて, 試料内の歪みや, それにともなう磁性や誘電性の変化を空間分布として定量的に評価できる方法を開発した。本技術を用いることで, 応力下での物性研究が進歩すると考えられる。
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