Study of novel quantum states in Yb-based compounds

2014 Fiscal Year Final Research Report

• Project/Area Number: 23340099
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: IZAWA Koichi 東京工業大学, 理工学研究科, 教授 (90302637)
• Co-Investigator(Kenkyū-buntansha): MACHIDA Yo 東京工業大学, 大学院理工学研究科, 助教 (40514740)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 物性実験 / 低温物性 / 量子臨界点 / 非フェルミ液体 / Yb化合物 / メタ磁性 / 強相関電子系

Outline of Final Research Achievements

In order to understand quantum criticality and anomalous electronic states near a quantum critical point (QCP) in quantum critical materials, we studied the specific heat, Seebeck coefficient, Nernst coefficient, and thermal conductivity of Yb-based strongly correlated electron systems under multi-extreme condition, such as low temperature, high field, and high pressure. Based on these results, we demonstrated the validity of Wiedemann-Franz law even around QCP and also clarified transport properties near metamagnetic transition in YbCo2Zn20，YbRh2Si2，β-YbAlB4. In addition, by means of the new analysis such as the ratio of the Seebeck coefficient to the specific heat, we succeeded to get crucial information for understanding the electronic states near QCP.

Free Research Field

低温物理学