Study of molecular-spin state in frustrated spinels focusing on spin-molecule-lattice coupling
| Project/Area Number |
25400348
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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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| Research Field |
Condensed matter physics II
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| Research Institution | Nihon University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | フラストレーション / スピネル / 超音波 / 弾性異常 / スピン分子 / 軌道整列 / 軌道揺らぎ / バナジウムスピネル / 軌道グラス状態 / 遍歴電子磁性体 / フェライトスピネル / スピン分子励起 / スピン・軌道励起 |
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| Outline of Final Research Achievements |
This project performed study of novel magnetic fluctuations and excitations in frustrated spinel compounds by using ultrasound velocity measurements. And remarkable research results were obtained especially in the study of spin-frustrated spinel ZnFe2O4, and the study of orbital-degenerate frustrated spinel MgV2O4.
The ferrite spinel ZnFe2O4 is a spin-frustrated magnet, which exhibits the absence of magnetic and structural transitions down to low temperature. The ultrasound velocity measurements observed elastic anomalies suggesting the evolution of frustration at low temperatures.
The vanadate spinel MgV2O4 is an orbital-degenerate frustrated magnet, which exhibits successive structural and antiferromagnetic transitions at 65 K and 42 K, respectively. The ultrasound velocity measurements observed elastic anomalies suggesting the coexistence of orbital fluctuations and local spin excitations, and elastic anomalies suggesting the enhancement of frustration by lattice disorder.
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Report
(4 results)
Research Products
(52 results)
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[Presentation] C15型ラーベス化合物ACo2 (A = Zr, Nb, Hf, Ta)の磁性2016
Author(s)
齋藤理貴, 小野拓海, 風間拓人, 村井亮太, 前田穂, 高瀬浩一, 高野良紀, 渡辺忠孝
Organizer
日本物理学会 第71回年次大会（2016年）
Place of Presentation
東北学院大学（宮城県・仙台市）
Year and Date
2016-03-21
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