Accurate Measurements of Electronic Heat Capacity by High-Speed Calorimetry Technique

2015 Fiscal Year Final Research Report

• Project/Area Number: 26887004
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: Kihara Takumi 東北大学, 金属材料研究所, 助教 (80733021)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Keywords: 比熱 / 極低温 / 核比熱 / 強磁場 / 強相関電子系

Outline of Final Research Achievements

We developed a rapid caloric measurement system, which can measure a heat capacity within 0.1 second at low temperatures and high magnetic fields. At low temperatures, the paramagnetic nuclear spins contribute to the total heat capacity, which shows the slow thermal relaxation process. Therefore, the estimation of the electronic contribution to the heat capacity is difficult by the relaxation method. The rapid caloric measurements enable us to measure the heat capacity without the delayed contribution of the nuclear spins. We successfully performed the accurate measurements of the electronic heat capacity of copper at the low temperatures down to 0.6 K and the high magnetic fields up to 17.5 T.

Free Research Field

強磁場物性