The study on the thermal conductivity of quantum spin magnets under pulse high magnetic field

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K20347
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: Nomoto Tetsuya 東京大学, 物性研究所, 特任研究員 (00908650)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 熱伝導率 / パルス強磁場 / 熱容量 / 量子スピン / ヒートパルス法

Outline of Final Research Achievements

We constructed a new thermal conductivity measurement system that can be used in pulsed high magnetic fields up to 40 T. The system is based on the heat pulse method and enables us to perform highly accurate and quick thermal conductivity measurements in the high magnetic field region. By using this system, we measured the thermal conductivity of a quantum spin material, SrCu2(BO3)2. We succeeded in observing a drastic reduction in thermal conductivity of SrCu2(BO3)2 above 20T, which is attributed to the effect of field-induced transition in this material.

Free Research Field

固体物性

Academic Significance and Societal Importance of the Research Achievements

物質の相転移を利用した熱制御・スイッチング技術は、高効率な排熱の実現や熱を利用した発電など様々な領域に応用が可能であり盛んに研究されている。今回の開発により強磁場中で起こる相転移が熱輸送に与える影響を検証できるようになったことで、新たな熱デバイス材料の探求や特異的な熱輸送現象を示す現象の探求が可能になったという点で、その学術的・社会的意義は大きいと考えられる。