Development of high precision SQUID magnetometer for measurements under high pressure and very low temperature and its application to the research on novel quantum phases

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13515
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Matsumoto Yosuke 東京大学, 物性研究所, 助教 (90422443)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 磁化測定 / フラストレーション磁性 / 多極子 / 軌道揺らぎ

Outline of Final Research Achievements

High precision SQUID magnetometer was developed, where we could measure DC magnetization and AC susceptibility even below 0.1 Hz of tiny samples down to a few tens mK. We achieved the sensitivity of 10-8 emu or higher for the DC measurements. In addition, we almost finalized the preparation of high pressure setup using a piston cylinder cell. This setup for high pressure high precision magnetization measurements will be quite useful for the studies of pressure induced quantum critical behavior and so on. On the other hand, using the set-up for ambient pressure measurements, the non-magnetic cage compound PrV2Al20, the chiral spin liquid compound Pr2Ir2O7 and the Kagome antiferromagnet Nd3Sb3Mg2O14 were studied.

Free Research Field

低温物理。主に強相関電子系を対象とした、極低温における熱力学量の精密測定。