Study of strongly correlated electronic properties on frustrated lattice in 5d transition metals
| Project/Area Number |
16K17732
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tohoku University |
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Principal Investigator |
AOYAMA Takuya 東北大学, 理学研究科, 助教 (80757261)
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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 |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 強相関電子物性 / 遷移金属化合物 / マルチフェロイクス / フラストレーション / 磁気多極子 / 5d電子系 / フラストレート磁性体 / 誘電率 / 高圧力 / 磁性 / 誘電性 / 強相関電子系 |
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| Outline of Final Research Achievements |
We measured the magnetoelectric effect of a compound containing trivalent ruthenium whose electronic configuration is same as tetravalent iridium. We observed the magnetodielectric effect due to the broken local space inversion symmetry. Infrared absorption spectra were measured to reveal details.
Single crystals of frustrated magnetic material containing tetravalent iridium cation were grown, X-ray crystal structure analysis, magnetoresistance effect, and specific heat were measured, and it was revealed that semimetal-like conduction characteristics are exhibited and magnetic transition occurs at low temperature. Moreover, we performed the resistivity measurement under pressure, and the pressure dependence of the magnetic transition was measured.
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| Academic Significance and Societal Importance of the Research Achievements |
ハニカム格子上においてボンド依存した強磁性相互作用をもつ場合，その基底状態は量子スピン液体になることが厳密に示されている．また遍歴および局在した分数励起によって有限温度の振る舞いが記述でき，そのうち遍歴自由度がDirac型の分散を示すことからトポロジカルな性質を持つことが指摘されている．我々は磁気誘電測定および赤外吸収スペクトル測定を通じて遍歴自由度の観測を試みた．その結果磁気転移温度以下で顕著な磁気誘電効果を観測するとともに，複数のフォノンに関連した新たな吸収を発見した．
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Report
(4 results)
Research Products
(37 results)
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[Journal Article] Quantum paramagnet near spin-state transition2018
Author(s)
K. Tomiyasu, N. Ito, R. Okazaki, Y. Takahashi, M. Onodera, K. Iwasa, T. Nojima, T. Aoyama, K. Ohgushi, Y. Ishikawa, T. Kamiyama, S. Ohira-Kawamura, M. Kofu and S. Ishihara
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Journal Title
Advanced Quantum Technology
Volume: 2018
Issue: 3
Pages: 1800057-1800057
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Orbital order and fluctuations in the two-leg ladder materials BaFe 2 X 3 ( X = S and Se) and CsFe 2 Se 32017
Author(s)
Kou Takubo, Yuichi Yokoyama, Hiroki Wadati, Shun Iwasaki, Takashi Mizokawa, Teak Boyko, Ronny Sutarto, Feizhou He, Kazuki Hashizume, Satoshi Imaizumi, Takuya Aoyama, Yoshinori Imai, and Kenya Ohgushi
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Journal Title
Physical Review B
Volume: 96
Issue: 11
Pages: 115157-115157
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] ハニカム格子物質α-RuCl3の超高速光応答 II2018
Author(s)
天野辰哉, 赤嶺勇人, 大橋拓純, 川上洋平, 伊藤弘毅, 長谷川慶直, 佐々木宏也, 青山拓也, 今井良宗, 大串研也, 岩井伸一郎
Organizer
日本物理学会
Related Report
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[Presentation] 梯子型超伝導体AFe2X3(A=Ba,Cs,X=S,Se)の共鳴X線散乱2018
Author(s)
田久保耕, 横山優一, 山本航平, 平田靖透, 和達大樹, 岩崎駿, 溝川貴司, Teak Boyko, Ronny Sutarto, Feizoh He, 今泉聖司, 青山拓也, 橋詰和樹, 今井良宗, 大串研也
Organizer
日本物理学会
Related Report
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[Presentation] AFe2X3(A=Ba,Cs,X=S,Se)の電子構造II2017
Author(s)
田久保耕, 和達大樹, 溝川貴司, Teak Boyko, Ronny Sutarto, Feizoh He, 今泉聖司, 青山拓也, 橋詰和樹, 今井良宗, 大串研也
Organizer
日本物理学会
Related Report
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[Presentation] 中性子とミュオンでみた鉄系梯子型物質BaFe2Se3の動的磁性2017
Author(s)
南部雄亮, 鈴木謙介, 羽合孝文, 長尾道弘, 横尾哲也, 伊藤晋一, 岡部博孝, 幸田章宏, 門野良典, 今泉聖司, 橋詰和樹, 青山拓也, 今井良宗, 大串研也
Organizer
日本物理学会
Related Report
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[Presentation] BaMn2Pn2(Pn=Mn,Sb,Bi)で観測される巨大磁気抵抗効果：合成と物性2017
Author(s)
Huynh K. Khuong, 小笠原拓磨, 北原慶汰, 平郡諭, 松下ステファン悠, 田邉洋一, 青山拓也, 大串研也, 木田孝則, 萩原政幸
Organizer
日本物理学会
Related Report
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