Creation of highly spin-thermal-conducting materials and elucidation of their mechanisms

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03458
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Tokyo Denki University (2022-2023); Tohoku University (2021)
• Principal Investigator: Kawamata Takayuki 東京電機大学, システム デザイン 工学部, 教授 (00431601)
• Co-Investigator(Kenkyū-buntansha): 加藤 雅恒 東北大学, 工学研究科, 准教授 (50211850)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: スピンによる熱伝導 / 熱伝導 / ２次元スピン系

Outline of Final Research Achievements

Long-term studies of thermal conductivity due to spins in low-dimensional quantum spin systems has shown that the spins of localized electrons can transport large amounts of heat. It is therefore expected that the thermal conductivity due to spins will be used to develop new insulating materials with high thermal conductivity. First, the aim was to create an insulating material with high thermal conductivity due to spins, but this was not achieved. On the other hand, the purpose of "clarifying the relationship between the magnitude of JS and the thermal conductivity due to spins" was achieved. From the obtained results, it is concluded that magnon-phonon scattering is important for the thermal conductivity due to spins in (La,Sr)2MO4. Therefore, it has been found that the key to the creation of new highly spin-thermal conducting materials is the suppression of magnon-phonon scattering.

Free Research Field

物性物理学

Academic Significance and Societal Importance of the Research Achievements

本研究の結果、スピン熱伝導において、マグノン-フォノン散乱が重要な役割を担っていることがわかった。このことは、マグノンの熱拡散に対する新しい知見であり、スピン熱伝導機構のひとつを解明することに至った。さらに、スピン流など様々なマグノンが拡散する現象に対する知見にもなり、本研究成果は学術的意義がある。また、この知見から、熱の再利用や排熱などに利用できる絶縁性高熱伝導材料を開発するための指針を新しく提供することができ、社会的意義も大きい。