High-pressure study of novel quantum phases via thermal properties

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03442
• 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: The University of Electro-Communications
• Principal Investigator: Matsubayashi Kazuyuki 電気通信大学, 大学院情報理工学研究科, 教授 (10451890)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 量子臨界現象 / 熱電特性 / 圧力効果

Outline of Final Research Achievements

In condensed matter physics, high pressure is widely used as a powerful tool to search for new physical properties and to elucidate their electronic states. In this study, we have developed and improved experimental methods of thermal properties under pressure, aiming to explore novel quantum phases due to spin, orbital and valence instabilities. Systematic studies under high pressure tuning have successfully revealed intriguing features common to prototypical materials exhibiting unconventional quantum critical phenomena. Furthermore, new routes to improve the properties of thermoelectric materials containing rare earth elements have been obtained.

Free Research Field

高圧力物性

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は非従来型の量子臨界現象の起源解明に加えて、希土類化合物における高い熱電特性の高圧力制御による理解という点で当該分野の進展に寄与するものである。特に、希土類元素を含む熱電材料に関して高い熱電特性を得るための指針が得られたことは新規材料開発のための重要な成果である。また、本研究を通じて培われた高圧力下での熱物性測定法は幅広い物質系における新奇物性の開拓に有用であり、この学術的意義は大きい。