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

• 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
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 強相関電子系 / 低温物性 / 多重極限 / 精密測定 / 超精密計測

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.

Research Products

• [Journal Article] Thermal expansion and magnetostriction measurements using a Quantum Design physical property measurement system (2014)
  • Author(s): Daiki Inoue, Daisuke Kaido, Yuta Yoshikawa, Mitsuyuki Minegishi, Koichi Matsumoto and Satoshi Abe
  • Journal Title: Journal of Physics Conf. Series Volume: 500 Issue: 3 Pages: 0320011-5
  • DOI: 10.1088/1742-6596/568/3/032001
  • Peer Reviewed
• [Journal Article] Nuclear Demagnetization for Ultra-low temperatures (2014)
  • Author(s): S. Abe and K. Matsumoto
  • Journal Title: Cryogenics Volume: 未定 Pages: 213-220
  • DOI: 10.1016/j.cryogenics.2014.04.004
  • NAID: 120005516432
  • Peer Reviewed
• [Journal Article] A compact capacitive dilatometer for thermal expansion and magnetostriction measurements at millikelvin temperatures (2012)
  • Author(s): S. Abe, F. Sasaki , T. Oonishi, D. Inoue, J. Yoshida, D. Takahashi, H. Tsujii, H. Suzuki, K. Matsumoto
  • Journal Title: Cryogenics Volume: 52 Pages: 452-456
  • Peer Reviewed
• [Presentation] Thermal expansion and magnetostriction measurements using a Quantum Design physical property measurement system (2014)
  • Author(s): Daiki Inoue, Daisuke Kaido, Yuta Yoshikawa, Mitsuyuki Minegishi, Koichi Matsumoto and Satoshi Abe
  • Organizer: 27th International Conference on Low Temperature Physics
  • Place of Presentation: Buenos Aires, Argentina
  • Year and Date: 2014-08-06 – 2014-08-13
• [Presentation] 超低温高磁場下における重い電子系CeRu2Si2の熱膨張・磁気歪精密測定 (2013)
  • Author(s): 井上大貴，高間弘幸，海道大祐，松本宏一，阿部聡
  • Organizer: 日本物理学会
  • Place of Presentation: 徳島大学
• [Presentation] 超低温・高磁場下における熱膨張・磁気歪精密測定によるCeRu_2Si_2量子臨界現象の研究 (2013)
  • Author(s): 井上大貴，髙間弘幸，海道大祐，松本宏一，阿部聡
  • Organizer: 日本物理学会
  • Place of Presentation: 広島大学