Novel quantum critical phenomena of a heavy fermion compound at ultralow temperatures in magnetic fields

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540367
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Kanazawa University
• Principal Investigator: SATOSHI ABE 金沢大学, 数物科学系, 准教授 (60251914)
• Co-Investigator(Kenkyū-buntansha): MATSUMOTO Koichi 金沢大学, 数物科学系, 教授 (10219496)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 強相関電子系 / 低温物性 / 多重極限

Outline of Final Research Achievements

We have developed dilatometric measurements at millikelvin temperatures down to 10 mK in magnetic fields up to 9 T using 3He-4He dilution refrigerator and 9 T superconducting magnet. The dilatometer provides the extremely high resolution of ΔL/L～10＾-10 using a ratio-transformer-based capacitance bridge. The quantum critical phenomena of the typical heavy Fermion compound CeRu2Si2 has been investigated by thermal expansion and magnetostriction measurements at millikelvin temperatures in magnetic fields. The temperature and magnetic field dependence of the critical contribution suggests the existence of an additional quantum critical point.

Free Research Field

低温物理学